Merge branch 'develop'

# Conflicts:
#	library.properties
#	src/AirGradient.h

docs/local-server.md

@@ -156,13 +156,13 @@ If the monitor is set up on the AirGradient dashboard, it will also receive the
 | `tvocLearningOffset`              | Set VOC learning gain offset.                                    | Number  | 0-720 (default 12)                                                                                                                      | `{"tvocLearningOffset": 12}`                    |
 | `offlineMode`                     | Set monitor to run without WiFi.                                 | Boolean |  `false`: Disabled (default) <br> `true`: Enabled                                                                                       | `{"offlineMode": true}`                         |
 | `monitorDisplayCompensatedValues` | Set the display show the PM value with/without compensate  value (only on [3.1.9]()) | Boolean | `false`: Without compensate (default) <br> `true`: with compensate                                                                      | `{"monitorDisplayCompensatedValues": false }`   |
-| `corrections`                     | Sets correction options to display and measurement values on local server response.    | Object |  _see corretions section_             | _see corretions section_                         |
+| `corrections`                     | Sets correction options to display and measurement values on local server response. (version >= [3.1.11]())    | Object |  _see corrections section_             | _see corrections section_                         |
 
 
 
 #### Corrections
 
-The `corrections` object allows configuring PM2.5 correction algorithms and parameters. This affects both the display and local server response values.
+The `corrections` object allows configuring PM2.5 correction algorithms and parameters locally. This affects both the display and local server response values.
 
 Example correction configuration:
 
@@ -189,13 +189,28 @@ Example correction configuration:
 | PMS5003_20231218 | `"slr_PMS5003_20231218"` | Correction for PMS5003 sensor batch 20231218| Yes |
 | PMS5003_20231030 | `"slr_PMS5003_20231030"` | Correction for PMS5003 sensor batch 20231030| Yes |
 
-**Notes**: 
+**NOTES**: 
 
-- Set `useEpa2021` to true if want to apply EPA 2021 correction factors on top of SLR correction value.
+- Set `useEpa2021` to `true` if want to apply EPA 2021 correction factors on top of SLR correction value, otherwise `false`
 - `intercept` and `scalingFactor` values can be obtained from [this article](https://www.airgradient.com/blog/low-readings-from-pms5003/)
+- If `configurationControl` is set to `local` (eg. when using Home Assistant), correction need to be set manually, see examples below 
 
-**Example**:
+**Examples**:
+
+- PMS5003_20231030 
 
 ```bash
-curl --location -X PUT 'http://airgradient_84fce612eff4.local/config' --header 'Content-Type: application/json' --data '{"corrections":{"pm02":{"correctionAlgorithm":"slr_PMS5003_20231030","slr":{"intercept":0,"scalingFactor":0.02838,"useEpa2021":false}}}}'
+curl --location -X PUT 'http://airgradient_84fce612eff4.local/config' --header 'Content-Type: application/json' --data '{"corrections":{"pm02":{"correctionAlgorithm":"slr_PMS5003_20231030","slr":{"intercept":0,"scalingFactor":0.02838,"useEpa2021":true}}}}'
-```
+```
+
+- PMS5003_20231218 
+
+```bash
+curl --location -X PUT 'http://airgradient_84fce612eff4.local/config' --header 'Content-Type: application/json' --data '{"corrections":{"pm02":{"correctionAlgorithm":"slr_PMS5003_20231218","slr":{"intercept":0,"scalingFactor":0.03525,"useEpa2021":true}}}}'
+```
+
+- PMS5003_20240104 
+
+```bash
+curl --location -X PUT 'http://airgradient_84fce612eff4.local/config' --header 'Content-Type: application/json' --data '{"corrections":{"pm02":{"correctionAlgorithm":"slr_PMS5003_20240104","slr":{"intercept":0,"scalingFactor":0.02896,"useEpa2021":true}}}}'
+```

examples/BASIC/BASIC.ino

@@ -331,7 +331,7 @@ static void sendDataToAg() {
   stateMachine.displayHandle(AgStateMachineWiFiOkServerConnecting);
 
   delay(1500);
-  if (apiClient.sendPing(wifiConnector.RSSI(), measurements.bootCount)) {
+  if (apiClient.sendPing(wifiConnector.RSSI(), measurements.bootCount())) {
     stateMachine.displayHandle(AgStateMachineWiFiOkServerConnected);
   } else {
     stateMachine.displayHandle(AgStateMachineWiFiOkServerConnectFailed);
@@ -518,7 +518,8 @@ static void updatePm(void) {
 
 static void sendDataToServer(void) {
   /** Increment bootcount when send measurements data is scheduled */
-  measurements.bootCount++;
+  int bootCount = measurements.bootCount() + 1;
+  measurements.setBootCount(bootCount);
 
   /** Ignore send data to server if postToAirGradient disabled */
   if (configuration.isPostDataToAirGradient() == false ||

examples/BASIC/OpenMetrics.cpp

@@ -57,26 +57,20 @@ String OpenMetrics::getPayload(void) {
       "gauge", "dbm");
   add_metric_point("", String(wifiConnector.RSSI()));
 
-  if (config.hasSensorS8 && measure.CO2 >= 0) {
+  // Initialize default invalid value for each measurements
-    add_metric("co2",
-               "Carbon dioxide concentration as measured by the AirGradient S8 "
-               "sensor, in parts per million",
-               "gauge", "ppm");
-    add_metric_point("", String(measure.CO2));
-  }
-
   float _temp = utils::getInvalidTemperature();
   float _hum = utils::getInvalidHumidity();
   int pm01 = utils::getInvalidPmValue();
   int pm25 = utils::getInvalidPmValue();
   int pm10 = utils::getInvalidPmValue();
   int pm03PCount = utils::getInvalidPmValue();
+  int co2 = utils::getInvalidCO2();
   int atmpCompensated = utils::getInvalidTemperature();
   int ahumCompensated = utils::getInvalidHumidity();
   int tvoc = utils::getInvalidVOC();
-  int tvoc_raw = utils::getInvalidVOC();
+  int tvocRaw = utils::getInvalidVOC();
   int nox = utils::getInvalidNOx();
-  int nox_raw = utils::getInvalidNOx();
+  int noxRaw = utils::getInvalidNOx();
 
   if (config.hasSensorSHT) {
     _temp = measure.getFloat(Measurements::Temperature);
@@ -87,16 +81,21 @@ String OpenMetrics::getPayload(void) {
 
   if (config.hasSensorPMS1) {
     pm01 = measure.get(Measurements::PM01);
-    pm25 = measure.get(Measurements::PM25);
+    float correctedPm = measure.getCorrectedPM25(*ag, config, false, 1);
+    pm25 = round(correctedPm);
     pm10 = measure.get(Measurements::PM10);
     pm03PCount = measure.get(Measurements::PM03_PC);
   }
 
   if (config.hasSensorSGP) {
     tvoc = measure.get(Measurements::TVOC);
-    tvoc_raw = measure.get(Measurements::TVOCRaw);
+    tvocRaw = measure.get(Measurements::TVOCRaw);
     nox = measure.get(Measurements::NOx);
-    nox_raw = measure.get(Measurements::NOxRaw);
+    noxRaw = measure.get(Measurements::NOxRaw);
+  }
+
+  if (config.hasSensorS8) {
+    co2 = measure.get(Measurements::CO2);
   }
 
   if (config.hasSensorPMS1) {
@@ -138,12 +137,12 @@ String OpenMetrics::getPayload(void) {
                  "gauge");
       add_metric_point("", String(tvoc));
     }
-    if (utils::isValidVOC(tvoc_raw)) {
+    if (utils::isValidVOC(tvocRaw)) {
       add_metric("tvoc_raw",
                  "The raw input value to the Total Volatile Organic Compounds "
                  "(TVOC) index as measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(tvoc_raw));
+      add_metric_point("", String(tvocRaw));
     }
     if (utils::isValidNOx(nox)) {
       add_metric("nox_index",
@@ -152,15 +151,23 @@ String OpenMetrics::getPayload(void) {
                  "gauge");
       add_metric_point("", String(nox));
     }
-    if (utils::isValidNOx(nox_raw)) {
+    if (utils::isValidNOx(noxRaw)) {
       add_metric("nox_raw",
                  "The raw input value to the Nitrous Oxide (NOx) index as "
                  "measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(nox_raw));
+      add_metric_point("", String(noxRaw));
     }
   }
 
+  if (utils::isValidCO2(co2)) {
+    add_metric("co2",
+               "Carbon dioxide concentration as measured by the AirGradient S8 "
+               "sensor, in parts per million",
+               "gauge", "ppm");
+    add_metric_point("", String(co2));
+  }
+
   if (utils::isValidTemperature(_temp)) {
     add_metric(
         "temperature",

examples/DiyProIndoorV3_3/DiyProIndoorV3_3.ino

@@ -388,7 +388,7 @@ static void sendDataToAg() {
   stateMachine.displayHandle(AgStateMachineWiFiOkServerConnecting);
 
   delay(1500);
-  if (apiClient.sendPing(wifiConnector.RSSI(), measurements.bootCount)) {
+  if (apiClient.sendPing(wifiConnector.RSSI(), measurements.bootCount())) {
     stateMachine.displayHandle(AgStateMachineWiFiOkServerConnected);
   } else {
     stateMachine.displayHandle(AgStateMachineWiFiOkServerConnectFailed);
@@ -570,7 +570,8 @@ static void updatePm(void) {
 
 static void sendDataToServer(void) {
   /** Increment bootcount when send measurements data is scheduled */
-  measurements.bootCount++;
+  int bootCount = measurements.bootCount() + 1;
+  measurements.setBootCount(bootCount);
 
   /** Ignore send data to server if postToAirGradient disabled */
   if (configuration.isPostDataToAirGradient() == false ||

examples/DiyProIndoorV3_3/OpenMetrics.cpp

@@ -57,26 +57,20 @@ String OpenMetrics::getPayload(void) {
       "gauge", "dbm");
   add_metric_point("", String(wifiConnector.RSSI()));
 
-  if (config.hasSensorS8 && measure.CO2 >= 0) {
+  // Initialize default invalid value for each measurements
-    add_metric("co2",
-               "Carbon dioxide concentration as measured by the AirGradient S8 "
-               "sensor, in parts per million",
-               "gauge", "ppm");
-    add_metric_point("", String(measure.CO2));
-  }
-
   float _temp = utils::getInvalidTemperature();
   float _hum = utils::getInvalidHumidity();
   int pm01 = utils::getInvalidPmValue();
   int pm25 = utils::getInvalidPmValue();
   int pm10 = utils::getInvalidPmValue();
   int pm03PCount = utils::getInvalidPmValue();
+  int co2 = utils::getInvalidCO2();
   int atmpCompensated = utils::getInvalidTemperature();
   int ahumCompensated = utils::getInvalidHumidity();
   int tvoc = utils::getInvalidVOC();
-  int tvoc_raw = utils::getInvalidVOC();
+  int tvocRaw = utils::getInvalidVOC();
   int nox = utils::getInvalidNOx();
-  int nox_raw = utils::getInvalidNOx();
+  int noxRaw = utils::getInvalidNOx();
 
   if (config.hasSensorSHT) {
     _temp = measure.getFloat(Measurements::Temperature);
@@ -87,16 +81,21 @@ String OpenMetrics::getPayload(void) {
 
   if (config.hasSensorPMS1) {
     pm01 = measure.get(Measurements::PM01);
-    pm25 = measure.get(Measurements::PM25);
+    float correctedPm = measure.getCorrectedPM25(*ag, config, false, 1);
+    pm25 = round(correctedPm);
     pm10 = measure.get(Measurements::PM10);
     pm03PCount = measure.get(Measurements::PM03_PC);
   }
 
   if (config.hasSensorSGP) {
     tvoc = measure.get(Measurements::TVOC);
-    tvoc_raw = measure.get(Measurements::TVOCRaw);
+    tvocRaw = measure.get(Measurements::TVOCRaw);
     nox = measure.get(Measurements::NOx);
-    nox_raw = measure.get(Measurements::NOxRaw);
+    noxRaw = measure.get(Measurements::NOxRaw);
+  }
+
+  if (config.hasSensorS8) {
+    co2 = measure.get(Measurements::CO2);
   }
 
   if (config.hasSensorPMS1) {
@@ -138,12 +137,13 @@ String OpenMetrics::getPayload(void) {
                  "gauge");
       add_metric_point("", String(tvoc));
     }
-    if (utils::isValidVOC(tvoc_raw)) {
+
+    if (utils::isValidVOC(tvocRaw)) {
       add_metric("tvoc_raw",
                  "The raw input value to the Total Volatile Organic Compounds "
                  "(TVOC) index as measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(tvoc_raw));
+      add_metric_point("", String(tvocRaw));
     }
     if (utils::isValidNOx(nox)) {
       add_metric("nox_index",
@@ -152,15 +152,23 @@ String OpenMetrics::getPayload(void) {
                  "gauge");
       add_metric_point("", String(nox));
     }
-    if (utils::isValidNOx(nox_raw)) {
+    if (utils::isValidNOx(noxRaw)) {
       add_metric("nox_raw",
                  "The raw input value to the Nitrous Oxide (NOx) index as "
                  "measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(nox_raw));
+      add_metric_point("", String(noxRaw));
     }
   }
 
+  if (utils::isValidCO2(co2)) {
+    add_metric("co2",
+               "Carbon dioxide concentration as measured by the AirGradient S8 "
+               "sensor, in parts per million",
+               "gauge", "ppm");
+    add_metric_point("", String(co2));
+  }
+
   if (utils::isValidTemperature(_temp)) {
     add_metric(
         "temperature",

examples/DiyProIndoorV4_2/DiyProIndoorV4_2.ino

@@ -411,7 +411,7 @@ static void sendDataToAg() {
   stateMachine.displayHandle(AgStateMachineWiFiOkServerConnecting);
 
   delay(1500);
-  if (apiClient.sendPing(wifiConnector.RSSI(), measurements.bootCount)) {
+  if (apiClient.sendPing(wifiConnector.RSSI(), measurements.bootCount())) {
     stateMachine.displayHandle(AgStateMachineWiFiOkServerConnected);
   } else {
     stateMachine.displayHandle(AgStateMachineWiFiOkServerConnectFailed);
@@ -611,7 +611,8 @@ static void updatePm(void) {
 
 static void sendDataToServer(void) {
   /** Increment bootcount when send measurements data is scheduled */
-  measurements.bootCount++;
+  int bootCount = measurements.bootCount() + 1;
+  measurements.setBootCount(bootCount);
 
   /** Ignore send data to server if postToAirGradient disabled */
   if (configuration.isPostDataToAirGradient() == false ||

examples/DiyProIndoorV4_2/OpenMetrics.cpp

@@ -57,26 +57,20 @@ String OpenMetrics::getPayload(void) {
       "gauge", "dbm");
   add_metric_point("", String(wifiConnector.RSSI()));
 
-  if (config.hasSensorS8 && measure.CO2 >= 0) {
+  // Initialize default invalid value for each measurements
-    add_metric("co2",
-               "Carbon dioxide concentration as measured by the AirGradient S8 "
-               "sensor, in parts per million",
-               "gauge", "ppm");
-    add_metric_point("", String(measure.CO2));
-  }
-
   float _temp = utils::getInvalidTemperature();
   float _hum = utils::getInvalidHumidity();
   int pm01 = utils::getInvalidPmValue();
   int pm25 = utils::getInvalidPmValue();
   int pm10 = utils::getInvalidPmValue();
   int pm03PCount = utils::getInvalidPmValue();
+  int co2 = utils::getInvalidCO2();
   int atmpCompensated = utils::getInvalidTemperature();
   int ahumCompensated = utils::getInvalidHumidity();
   int tvoc = utils::getInvalidVOC();
-  int tvoc_raw = utils::getInvalidVOC();
+  int tvocRaw = utils::getInvalidVOC();
   int nox = utils::getInvalidNOx();
-  int nox_raw = utils::getInvalidNOx();
+  int noxRaw = utils::getInvalidNOx();
 
   if (config.hasSensorSHT) {
     _temp = measure.getFloat(Measurements::Temperature);
@@ -87,16 +81,21 @@ String OpenMetrics::getPayload(void) {
 
   if (config.hasSensorPMS1) {
     pm01 = measure.get(Measurements::PM01);
-    pm25 = measure.get(Measurements::PM25);
+    float correctedPm = measure.getCorrectedPM25(*ag, config, false, 1);
+    pm25 = round(correctedPm);
     pm10 = measure.get(Measurements::PM10);
     pm03PCount = measure.get(Measurements::PM03_PC);
   }
 
   if (config.hasSensorSGP) {
     tvoc = measure.get(Measurements::TVOC);
-    tvoc_raw = measure.get(Measurements::TVOCRaw);
+    tvocRaw = measure.get(Measurements::TVOCRaw);
     nox = measure.get(Measurements::NOx);
-    nox_raw = measure.get(Measurements::NOxRaw);
+    noxRaw = measure.get(Measurements::NOxRaw);
+  }
+
+  if (config.hasSensorS8) {
+    co2 = measure.get(Measurements::CO2);
   }
 
   if (config.hasSensorPMS1) {
@@ -138,12 +137,12 @@ String OpenMetrics::getPayload(void) {
                  "gauge");
       add_metric_point("", String(tvoc));
     }
-    if (utils::isValidVOC(tvoc_raw)) {
+    if (utils::isValidVOC(tvocRaw)) {
       add_metric("tvoc_raw",
                  "The raw input value to the Total Volatile Organic Compounds "
                  "(TVOC) index as measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(tvoc_raw));
+      add_metric_point("", String(tvocRaw));
     }
     if (utils::isValidNOx(nox)) {
       add_metric("nox_index",
@@ -152,15 +151,23 @@ String OpenMetrics::getPayload(void) {
                  "gauge");
       add_metric_point("", String(nox));
     }
-    if (utils::isValidNOx(nox_raw)) {
+    if (utils::isValidNOx(noxRaw)) {
       add_metric("nox_raw",
                  "The raw input value to the Nitrous Oxide (NOx) index as "
                  "measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(nox_raw));
+      add_metric_point("", String(noxRaw));
     }
   }
 
+  if (utils::isValidCO2(co2)) {
+    add_metric("co2",
+               "Carbon dioxide concentration as measured by the AirGradient S8 "
+               "sensor, in parts per million",
+               "gauge", "ppm");
+    add_metric_point("", String(co2));
+  }
+
   if (utils::isValidTemperature(_temp)) {
     add_metric(
         "temperature",

examples/OneOpenAir/OneOpenAir.ino

@@ -36,20 +36,21 @@ CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 
 */
 
-#include <HardwareSerial.h>
-#include "AirGradient.h"
-#include "OtaHandler.h"
 #include "AgApiClient.h"
 #include "AgConfigure.h"
 #include "AgSchedule.h"
 #include "AgStateMachine.h"
 #include "AgWiFiConnector.h"
+#include "AirGradient.h"
 #include "EEPROM.h"
 #include "ESPmDNS.h"
 #include "LocalServer.h"
 #include "MqttClient.h"
 #include "OpenMetrics.h"
+#include "OtaHandler.h"
 #include "WebServer.h"
+#include "esp32c3/rom/rtc.h"
+#include <HardwareSerial.h>
 #include <WebServer.h>
 #include <WiFi.h>
 
@@ -111,9 +112,8 @@ static void wdgFeedUpdate(void);
 static void ledBarEnabledUpdate(void);
 static bool sgp41Init(void);
 static void firmwareCheckForUpdate(void);
-static void otaHandlerCallback(OtaState state, String mesasge);
+static void otaHandlerCallback(OtaHandler::OtaState state, String mesasge);
-static void displayExecuteOta(OtaState state, String msg,
+static void displayExecuteOta(OtaHandler::OtaState state, String msg, int processing);
-                              int processing);
 static int calculateMaxPeriod(int updateInterval);
 static void setMeasurementMaxPeriod();
 
@@ -136,6 +136,10 @@ void setup() {
   /** Print device ID into log */
   Serial.println("Serial nr: " + ag->deviceId());
 
+  // Set reason why esp is reset
+  esp_reset_reason_t reason = esp_reset_reason();
+  measurements.setResetReason(reason);
+
   /** Initialize local configure */
   configuration.begin();
 
@@ -168,7 +172,7 @@ void setup() {
   boardInit();
   setMeasurementMaxPeriod();
 
-  // Uncomment below line to print every measurements reading update
+  // Comment below line to disable debug measurement readings
   measurements.setDebug(true);
 
   /** Connecting wifi */
@@ -514,29 +518,27 @@ static void firmwareCheckForUpdate(void) {
   Serial.println();
 }
 
-static void otaHandlerCallback(OtaState state, String mesasge) {
+static void otaHandlerCallback(OtaHandler::OtaState state, String message) {
-  Serial.println("OTA message: " + mesasge);
+  Serial.println("OTA message: " + message);
   switch (state) {
-  case OtaState::OTA_STATE_BEGIN:
+  case OtaHandler::OTA_STATE_BEGIN:
     displayExecuteOta(state, fwNewVersion, 0);
     break;
-  case OtaState::OTA_STATE_FAIL:
+  case OtaHandler::OTA_STATE_FAIL:
     displayExecuteOta(state, "", 0);
     break;
-  case OtaState::OTA_STATE_PROCESSING:
+  case OtaHandler::OTA_STATE_PROCESSING:
-    displayExecuteOta(state, "", mesasge.toInt());
+  case OtaHandler::OTA_STATE_SUCCESS:
-    break;
+    displayExecuteOta(state, "", message.toInt());
-  case OtaState::OTA_STATE_SUCCESS:
-    displayExecuteOta(state, "", mesasge.toInt());
     break;
   default:
     break;
   }
 }
 
-static void displayExecuteOta(OtaState state, String msg, int processing) {
+static void displayExecuteOta(OtaHandler::OtaState state, String msg, int processing) {
   switch (state) {
-  case OtaState::OTA_STATE_BEGIN: {
+  case OtaHandler::OTA_STATE_BEGIN: {
     if (ag->isOne()) {
       oledDisplay.showFirmwareUpdateVersion(msg);
     } else {
@@ -545,7 +547,7 @@ static void displayExecuteOta(OtaState state, String msg, int processing) {
     delay(2500);
     break;
   }
-  case OtaState::OTA_STATE_FAIL: {
+  case OtaHandler::OTA_STATE_FAIL: {
     if (ag->isOne()) {
       oledDisplay.showFirmwareUpdateFailed();
     } else {
@@ -555,7 +557,7 @@ static void displayExecuteOta(OtaState state, String msg, int processing) {
     delay(2500);
     break;
   }
-  case OtaState::OTA_STATE_SKIP: {
+  case OtaHandler::OTA_STATE_SKIP: {
     if (ag->isOne()) {
       oledDisplay.showFirmwareUpdateSkipped();
     } else {
@@ -565,7 +567,7 @@ static void displayExecuteOta(OtaState state, String msg, int processing) {
     delay(2500);
     break;
   }
-  case OtaState::OTA_STATE_UP_TO_DATE: {
+  case OtaHandler::OTA_STATE_UP_TO_DATE: {
     if (ag->isOne()) {
       oledDisplay.showFirmwareUpdateUpToDate();
     } else {
@@ -575,7 +577,7 @@ static void displayExecuteOta(OtaState state, String msg, int processing) {
     delay(2500);
     break;
   }
-  case OtaState::OTA_STATE_PROCESSING: {
+  case OtaHandler::OTA_STATE_PROCESSING: {
     if (ag->isOne()) {
       oledDisplay.showFirmwareUpdateProgress(processing);
     } else {
@@ -584,7 +586,7 @@ static void displayExecuteOta(OtaState state, String msg, int processing) {
 
     break;
   }
-  case OtaState::OTA_STATE_SUCCESS: {
+  case OtaHandler::OTA_STATE_SUCCESS: {
     int i = 6;
     while(i != 0) {
       i = i - 1;
@@ -634,7 +636,7 @@ static void sendDataToAg() {
       "task_led", 2048, NULL, 5, NULL);
 
   delay(1500);
-  if (apiClient.sendPing(wifiConnector.RSSI(), measurements.bootCount)) {
+  if (apiClient.sendPing(wifiConnector.RSSI(), measurements.bootCount())) {
     if (ag->isOne()) {
       stateMachine.displayHandle(AgStateMachineWiFiOkServerConnected);
     }
@@ -1135,7 +1137,8 @@ static void updatePm(void) {
 
 static void sendDataToServer(void) {
   /** Increment bootcount when send measurements data is scheduled */
-  measurements.bootCount++;
+  int bootCount = measurements.bootCount() + 1;
+  measurements.setBootCount(bootCount);
 
   /** Ignore send data to server if postToAirGradient disabled */
   if (configuration.isPostDataToAirGradient() == false || configuration.isOfflineMode()) {
@@ -1149,6 +1152,9 @@ static void sendDataToServer(void) {
         "Online mode and isPostToAirGradient = true: watchdog reset");
     Serial.println();
   }
+
+  /** Log current free heap size */
+  Serial.printf("Free heap: %u\n", ESP.getFreeHeap());
 }
 
 static void tempHumUpdate(void) {
@@ -1216,6 +1222,6 @@ void setMeasurementMaxPeriod() {
 }
 
 int calculateMaxPeriod(int updateInterval) {
-  // 0.5 is 50% reduced interval for max period
+  // 0.8 is 80% reduced interval for max period
-  return (SERVER_SYNC_INTERVAL - (SERVER_SYNC_INTERVAL * 0.5)) / updateInterval;
+  return (SERVER_SYNC_INTERVAL - (SERVER_SYNC_INTERVAL * 0.8)) / updateInterval;
 }

examples/OneOpenAir/OpenMetrics.cpp

@@ -57,22 +57,22 @@ String OpenMetrics::getPayload(void) {
       "gauge", "dbm");
   add_metric_point("", String(wifiConnector.RSSI()));
 
-  if (config.hasSensorS8 && measure.CO2 >= 0) {
+  // Initialize default invalid value for each measurements
-    add_metric("co2",
-               "Carbon dioxide concentration as measured by the AirGradient S8 "
-               "sensor, in parts per million",
-               "gauge", "ppm");
-    add_metric_point("", String(measure.CO2));
-  }
-
   float _temp = utils::getInvalidTemperature();
   float _hum = utils::getInvalidHumidity();
   int pm01 = utils::getInvalidPmValue();
   int pm25 = utils::getInvalidPmValue();
   int pm10 = utils::getInvalidPmValue();
   int pm03PCount = utils::getInvalidPmValue();
+  int co2 = utils::getInvalidCO2();
   int atmpCompensated = utils::getInvalidTemperature();
   int ahumCompensated = utils::getInvalidHumidity();
+  int tvoc = utils::getInvalidVOC();
+  int tvocRaw = utils::getInvalidVOC();
+  int nox = utils::getInvalidNOx();
+  int noxRaw = utils::getInvalidNOx();
+
+  // Get values
   if (config.hasSensorPMS1 && config.hasSensorPMS2) {
     _temp = (measure.getFloat(Measurements::Temperature, 1) +
              measure.getFloat(Measurements::Temperature, 2)) /
@@ -81,7 +81,10 @@ String OpenMetrics::getPayload(void) {
             measure.getFloat(Measurements::Humidity, 2)) /
            2.0f;
     pm01 = (measure.get(Measurements::PM01, 1) + measure.get(Measurements::PM01, 2)) / 2.0f;
-    pm25 = (measure.get(Measurements::PM25, 1) + measure.get(Measurements::PM25, 2)) / 2.0f;
+    float correctedPm25_1 = measure.getCorrectedPM25(*ag, config, false, 1);
+    float correctedPm25_2 = measure.getCorrectedPM25(*ag, config, false, 2);
+    float correctedPm25 = (correctedPm25_1 + correctedPm25_2) / 2.0f;
+    pm25 = round(correctedPm25);
     pm10 = (measure.get(Measurements::PM10, 1) + measure.get(Measurements::PM10, 2)) / 2.0f;
     pm03PCount =
         (measure.get(Measurements::PM03_PC, 1) + measure.get(Measurements::PM03_PC, 2)) / 2.0f;
@@ -94,7 +97,8 @@ String OpenMetrics::getPayload(void) {
 
       if (config.hasSensorPMS1) {
         pm01 = measure.get(Measurements::PM01);
-        pm25 = measure.get(Measurements::PM25);
+        float correctedPm = measure.getCorrectedPM25(*ag, config, false, 1);
+        pm25 = round(correctedPm);
         pm10 = measure.get(Measurements::PM10);
         pm03PCount = measure.get(Measurements::PM03_PC);
       }
@@ -103,7 +107,8 @@ String OpenMetrics::getPayload(void) {
         _temp = measure.getFloat(Measurements::Temperature, 1);
         _hum = measure.getFloat(Measurements::Humidity, 1);
         pm01 = measure.get(Measurements::PM01, 1);
-        pm25 = measure.get(Measurements::PM25, 1);
+        float correctedPm = measure.getCorrectedPM25(*ag, config, false, 1);
+        pm25 = round(correctedPm);
         pm10 = measure.get(Measurements::PM10, 1);
         pm03PCount = measure.get(Measurements::PM03_PC, 1);
       }
@@ -111,13 +116,25 @@ String OpenMetrics::getPayload(void) {
         _temp = measure.getFloat(Measurements::Temperature, 2);
         _hum = measure.getFloat(Measurements::Humidity, 2);
         pm01 = measure.get(Measurements::PM01, 2);
-        pm25 = measure.get(Measurements::PM25, 2);
+        float correctedPm = measure.getCorrectedPM25(*ag, config, false, 2);
+        pm25 = round(correctedPm);
         pm10 = measure.get(Measurements::PM10, 2);
         pm03PCount = measure.get(Measurements::PM03_PC, 2);
       }
     }
   }
 
+  if (config.hasSensorSGP) {
+    tvoc = measure.get(Measurements::TVOC);
+    tvocRaw = measure.get(Measurements::TVOCRaw);
+    nox = measure.get(Measurements::NOx);
+    noxRaw = measure.get(Measurements::NOxRaw);
+  }
+
+  if (config.hasSensorS8) {
+    co2 = measure.get(Measurements::CO2);
+  }
+
   /** Get temperature and humidity compensated */
   if (ag->isOne()) {
     atmpCompensated = _temp;
@@ -127,6 +144,7 @@ String OpenMetrics::getPayload(void) {
     ahumCompensated = ag->pms5003t_1.compensateHum(_hum);
   }
 
+  // Add measurements that valid to the metrics
   if (config.hasSensorPMS1 || config.hasSensorPMS2) {
     if (utils::isValidPm(pm01)) {
       add_metric("pm1",
@@ -159,36 +177,44 @@ String OpenMetrics::getPayload(void) {
   }
 
   if (config.hasSensorSGP) {
-    if (utils::isValidVOC(measure.TVOC)) {
+    if (utils::isValidVOC(tvoc)) {
       add_metric("tvoc_index",
                  "The processed Total Volatile Organic Compounds (TVOC) index "
                  "as measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(measure.TVOC));
+      add_metric_point("", String(tvoc));
     }
-    if (utils::isValidVOC(measure.TVOCRaw)) {
+    if (utils::isValidVOC(tvocRaw)) {
       add_metric("tvoc_raw",
                  "The raw input value to the Total Volatile Organic Compounds "
                  "(TVOC) index as measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(measure.TVOCRaw));
+      add_metric_point("", String(tvocRaw));
     }
-    if (utils::isValidNOx(measure.NOx)) {
+    if (utils::isValidNOx(nox)) {
       add_metric("nox_index",
                  "The processed Nitrous Oxide (NOx) index as measured by the "
                  "AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(measure.NOx));
+      add_metric_point("", String(nox));
     }
-    if (utils::isValidNOx(measure.NOxRaw)) {
+    if (utils::isValidNOx(noxRaw)) {
       add_metric("nox_raw",
                  "The raw input value to the Nitrous Oxide (NOx) index as "
                  "measured by the AirGradient SGP sensor",
                  "gauge");
-      add_metric_point("", String(measure.NOxRaw));
+      add_metric_point("", String(noxRaw));
     }
   }
 
+  if (utils::isValidCO2(co2)) {
+    add_metric("co2",
+               "Carbon dioxide concentration as measured by the AirGradient S8 "
+               "sensor, in parts per million",
+               "gauge", "ppm");
+    add_metric_point("", String(co2));
+  }
+
   if (utils::isValidTemperature(_temp)) {
     add_metric("temperature",
                "The ambient temperature as measured by the AirGradient SHT / PMS "
@@ -197,25 +223,21 @@ String OpenMetrics::getPayload(void) {
     add_metric_point("", String(_temp));
   }
   if (utils::isValidTemperature(atmpCompensated)) {
-    add_metric(
+    add_metric("temperature_compensated",
-        "temperature_compensated",
+               "The compensated ambient temperature as measured by the AirGradient SHT / PMS "
-        "The compensated ambient temperature as measured by the AirGradient SHT / PMS "
+               "sensor, in degrees Celsius",
-        "sensor, in degrees Celsius",
+               "gauge", "celsius");
-        "gauge", "celsius");
     add_metric_point("", String(atmpCompensated));
   }
   if (utils::isValidHumidity(_hum)) {
-    add_metric(
+    add_metric("humidity", "The relative humidity as measured by the AirGradient SHT sensor",
-        "humidity",
+               "gauge", "percent");
-        "The relative humidity as measured by the AirGradient SHT sensor",
-        "gauge", "percent");
     add_metric_point("", String(_hum));
   }
   if (utils::isValidHumidity(ahumCompensated)) {
-    add_metric(
+    add_metric("humidity_compensated",
-        "humidity_compensated",
+               "The compensated relative humidity as measured by the AirGradient SHT / PMS sensor",
-        "The compensated relative humidity as measured by the AirGradient SHT / PMS sensor",
+               "gauge", "percent");
-        "gauge", "percent");
     add_metric_point("", String(ahumCompensated));
   }
 

examples/OneOpenAir/OtaHandler.h

@@ -1,206 +0,0 @@
-#ifndef _OTA_HANDLER_H_
-#define _OTA_HANDLER_H_
-#include <Arduino.h>
-#include <esp_err.h>
-#include <esp_http_client.h>
-#include <esp_ota_ops.h>
-
-#define OTA_BUF_SIZE 1024
-#define URL_BUF_SIZE 256
-
-enum OtaUpdateOutcome {
-  UPDATE_PERFORMED,
-  ALREADY_UP_TO_DATE,
-  UPDATE_FAILED,
-  UDPATE_SKIPPED
-};
-
-enum OtaState {
-  OTA_STATE_BEGIN,
-  OTA_STATE_FAIL,
-  OTA_STATE_SKIP,
-  OTA_STATE_UP_TO_DATE,
-  OTA_STATE_PROCESSING,
-  OTA_STATE_SUCCESS
-};
-
-typedef void(*OtaHandlerCallback_t)(OtaState state,
-                                   String message);
-
-class OtaHandler {
-public:
-  void updateFirmwareIfOutdated(String deviceId) {
-    String url = "http://hw.airgradient.com/sensors/airgradient:" + deviceId +
-                 "/generic/os/firmware.bin";
-    url += "?current_firmware=";
-    url += GIT_VERSION;
-    char urlAsChar[URL_BUF_SIZE];
-    url.toCharArray(urlAsChar, URL_BUF_SIZE);
-    Serial.printf("checking for new OTA update @ %s\n", urlAsChar);
-
-    esp_http_client_config_t config = {};
-    config.url = urlAsChar;
-    OtaUpdateOutcome ret = attemptToPerformOta(&config);
-    Serial.println(ret);
-    if (this->callback) {
-      switch (ret) {
-      case OtaUpdateOutcome::UPDATE_PERFORMED:
-        this->callback(OtaState::OTA_STATE_SUCCESS, "");
-        break;
-      case OtaUpdateOutcome::UDPATE_SKIPPED:
-        this->callback(OtaState::OTA_STATE_SKIP, "");
-        break;
-      case OtaUpdateOutcome::ALREADY_UP_TO_DATE:
-        this->callback(OtaState::OTA_STATE_UP_TO_DATE, "");
-        break;
-      case OtaUpdateOutcome::UPDATE_FAILED:
-        this->callback(OtaState::OTA_STATE_FAIL, "");
-        break;
-      default:
-        break;
-      }
-    }
-  }
-
-  void setHandlerCallback(OtaHandlerCallback_t callback) {
-    this->callback = callback;
-  }
-
-private:
-  OtaHandlerCallback_t callback;
-
-  OtaUpdateOutcome attemptToPerformOta(const esp_http_client_config_t *config) {
-    esp_http_client_handle_t client = esp_http_client_init(config);
-    if (client == NULL) {
-      Serial.println("Failed to initialize HTTP connection");
-      return OtaUpdateOutcome::UPDATE_FAILED;
-    }
-
-    esp_err_t err = esp_http_client_open(client, 0);
-    if (err != ESP_OK) {
-      esp_http_client_cleanup(client);
-      Serial.printf("Failed to open HTTP connection: %s\n",
-                    esp_err_to_name(err));
-      return OtaUpdateOutcome::UPDATE_FAILED;
-    }
-    esp_http_client_fetch_headers(client);
-
-    int httpStatusCode = esp_http_client_get_status_code(client);
-    if (httpStatusCode == 304) {
-      Serial.println("Firmware is already up to date");
-      cleanupHttp(client);
-      return OtaUpdateOutcome::ALREADY_UP_TO_DATE;
-    } else if (httpStatusCode != 200) {
-      Serial.printf("Firmware update skipped, the server returned %d\n",
-                    httpStatusCode);
-      cleanupHttp(client);
-      return OtaUpdateOutcome::UDPATE_SKIPPED;
-    }
-
-    esp_ota_handle_t update_handle = 0;
-    const esp_partition_t *update_partition = NULL;
-    Serial.println("Starting OTA update ...");
-    update_partition = esp_ota_get_next_update_partition(NULL);
-    if (update_partition == NULL) {
-      Serial.println("Passive OTA partition not found");
-      cleanupHttp(client);
-      return OtaUpdateOutcome::UPDATE_FAILED;
-    }
-    Serial.printf("Writing to partition subtype %d at offset 0x%x\n",
-                  update_partition->subtype, update_partition->address);
-
-    err = esp_ota_begin(update_partition, OTA_SIZE_UNKNOWN, &update_handle);
-    if (err != ESP_OK) {
-      Serial.printf("esp_ota_begin failed, error=%d\n", err);
-      cleanupHttp(client);
-      return OtaUpdateOutcome::UPDATE_FAILED;
-    }
-
-    esp_err_t ota_write_err = ESP_OK;
-    char *upgrade_data_buf = (char *)malloc(OTA_BUF_SIZE);
-    if (!upgrade_data_buf) {
-      Serial.println("Couldn't allocate memory for data buffer");
-      return OtaUpdateOutcome::UPDATE_FAILED;
-    }
-
-    int binary_file_len = 0;
-    int totalSize = esp_http_client_get_content_length(client);
-    Serial.println("File size: " + String(totalSize) + String(" bytes"));
-
-    // Show display start update new firmware.
-    if (this->callback) {
-      this->callback(OtaState::OTA_STATE_BEGIN, "");
-    }
-
-    // Download file and write new firmware to OTA partition
-    uint32_t lastUpdate = millis();
-    while (1) {
-      int data_read =
-          esp_http_client_read(client, upgrade_data_buf, OTA_BUF_SIZE);
-      if (data_read == 0) {
-        if (this->callback) {
-          this->callback(OtaState::OTA_STATE_PROCESSING, String(100));
-        }
-        Serial.println("Connection closed, all data received");
-        break;
-      }
-      if (data_read < 0) {
-        Serial.println("Data read error");
-        if (this->callback) {
-          this->callback(OtaState::OTA_STATE_FAIL, "");
-        }
-        break;
-      }
-      if (data_read > 0) {
-        ota_write_err = esp_ota_write(
-            update_handle, (const void *)upgrade_data_buf, data_read);
-        if (ota_write_err != ESP_OK) {
-          if (this->callback) {
-            this->callback(OtaState::OTA_STATE_FAIL, "");
-          }
-          break;
-        }
-        binary_file_len += data_read;
-
-        int percent = (binary_file_len * 100) / totalSize;
-        uint32_t ms = (uint32_t)(millis() - lastUpdate);
-        if (ms >= 250) {
-          // sm.executeOTA(StateMachine::OtaState::OTA_STATE_PROCESSING, "",
-          //               percent);
-          if (this->callback) {
-            this->callback(OtaState::OTA_STATE_PROCESSING,
-                           String(percent));
-          }
-          lastUpdate = millis();
-        }
-      }
-    }
-    free(upgrade_data_buf);
-    cleanupHttp(client);
-    Serial.printf("# of bytes written: %d\n", binary_file_len);
-
-    esp_err_t ota_end_err = esp_ota_end(update_handle);
-    if (ota_write_err != ESP_OK) {
-      Serial.printf("Error: esp_ota_write failed! err=0x%d\n", err);
-      return OtaUpdateOutcome::UPDATE_FAILED;
-    } else if (ota_end_err != ESP_OK) {
-      Serial.printf("Error: esp_ota_end failed! err=0x%d. Image is invalid",
-                    ota_end_err);
-      return OtaUpdateOutcome::UPDATE_FAILED;
-    }
-
-    err = esp_ota_set_boot_partition(update_partition);
-    if (err != ESP_OK) {
-      Serial.printf("esp_ota_set_boot_partition failed! err=0x%d\n", err);
-      return OtaUpdateOutcome::UPDATE_FAILED;
-    }
-    return OtaUpdateOutcome::UPDATE_PERFORMED;
-  }
-
-  void cleanupHttp(esp_http_client_handle_t client) {
-    esp_http_client_close(client);
-    esp_http_client_cleanup(client);
-  }
-};
-
-#endif

library.properties

@@ -1,5 +1,5 @@
 name=AirGradient Air Quality Sensor
-version=3.1.10
+version=3.1.21
 author=AirGradient <support@airgradient.com>
 maintainer=AirGradient <support@airgradient.com>
 sentence=ESP32-C3 / ESP8266 library for air quality monitor measuring PM, CO2, Temperature, TVOC and Humidity with OLED display.

src/AgApiClient.cpp

@@ -59,9 +59,20 @@ bool AgApiClient::fetchServerConfiguration(void) {
 #else
   HTTPClient client;
   client.setTimeout(timeoutMs);
-  if (client.begin(uri) == false) {
+  if (apiRootChanged) {
-    getConfigFailed = true;
+    // If apiRoot is changed, assume not using https
-    return false;
+    if (client.begin(uri) == false) {
+      logError("Begin HTTPClient failed (GET)");
+      getConfigFailed = true;
+      return false;
+    }
+  } else {
+    // By default, airgradient using https
+    if (client.begin(uri, AG_SERVER_ROOT_CA) == false) {
+      logError("Begin HTTPClient using tls failed (GET)");
+      getConfigFailed = true;
+      return false;
+    }
   }
 #endif
 
@@ -90,8 +101,6 @@ bool AgApiClient::fetchServerConfiguration(void) {
   String respContent = client.getString();
   client.end();
 
-  // logInfo("Get configuration: " + respContent);
-
   /** Parse configuration and return result */
   return config.parse(respContent, false);
 }
@@ -115,22 +124,37 @@ bool AgApiClient::postToServer(String data) {
   }
 
   String uri = apiRoot + "/sensors/airgradient:" + ag->deviceId() + "/measures";
-  // logInfo("Post uri: " + uri);
+#ifdef ESP8266
-  // logInfo("Post data: " + data);
-
-  WiFiClient wifiClient;
   HTTPClient client;
-  client.setTimeout(timeoutMs);
+  WiFiClient wifiClient;
-  if (client.begin(wifiClient, uri.c_str()) == false) {
+  if (client.begin(wifiClient, uri) == false) {
-    logError("Init client failed");
+    getConfigFailed = true;
     return false;
   }
+#else
+  HTTPClient client;
+  client.setTimeout(timeoutMs);
+  if (apiRootChanged) {
+    // If apiRoot is changed, assume not using https
+    if (client.begin(uri) == false) {
+      logError("Begin HTTPClient failed (POST)");
+      getConfigFailed = true;
+      return false;
+    }
+  } else {
+    // By default, airgradient using https
+    if (client.begin(uri, AG_SERVER_ROOT_CA) == false) {
+      logError("Begin HTTPClient using tls failed (POST)");
+      getConfigFailed = true;
+      return false;
+    }
+  }
+#endif
   client.addHeader("content-type", "application/json");
   int retCode = client.POST(data);
   client.end();
 
   logInfo(String("POST: ") + uri);
-  // logInfo(String("DATA: ") + data);
   logInfo(String("Return code: ") + String(retCode));
 
   if ((retCode == 200) || (retCode == 429)) {
@@ -189,7 +213,10 @@ bool AgApiClient::sendPing(int rssi, int bootCount) {
 
 String AgApiClient::getApiRoot() const { return apiRoot; }
 
-void AgApiClient::setApiRoot(const String &apiRoot) { this->apiRoot = apiRoot; }
+void AgApiClient::setApiRoot(const String &apiRoot) {
+  this->apiRootChanged = true;
+  this->apiRoot = apiRoot;
+}
 
 /**
  * @brief Set http request timeout. (Default: 10s)

src/AgApiClient.h

@@ -20,8 +20,14 @@ class AgApiClient : public PrintLog {
 private:
   Configuration &config;
   AirGradient *ag;
+#ifdef ESP8266
+  // ESP8266 not support HTTPS
   String apiRoot = "http://hw.airgradient.com";
+#else
+  String apiRoot = "https://hw.airgradient.com";
+#endif
 
+  bool apiRootChanged = false; // Indicate if setApiRoot() is called
   bool getConfigFailed;
   bool postToServerFailed;
   bool notAvailableOnDashboard = false; // Device not setup on Airgradient cloud dashboard.

src/AgConfigure.cpp

@@ -292,8 +292,8 @@ void Configuration::defaultConfig(void) {
   // PM2.5 correction
   pmCorrection.algorithm = None;
   pmCorrection.changed = false;
-  pmCorrection.intercept = -1;
+  pmCorrection.intercept = 0;
-  pmCorrection.scalingFactor = -1;
+  pmCorrection.scalingFactor = 1;
   pmCorrection.useEPA = false;
 
   saveConfig();
@@ -354,16 +354,16 @@ bool Configuration::begin(void) {
  * @return false Failure
  */
 bool Configuration::parse(String data, bool isLocal) {
-  logInfo("Parse configure: " + data);
+  logInfo("Parsing configuration: " + data);
 
   JSONVar root = JSON.parse(data);
   failedMessage = "";
-  if (root == undefined) {
+  if (root == undefined || JSONVar::typeof_(root) != "object") {
+    logError("Parse configuration failed, JSON invalid (" + JSONVar::typeof_(root) + ")");
     failedMessage = "JSON invalid";
-    logError(failedMessage);
     return false;
   }
-  logInfo("Parse configure success");
+  logInfo("Parse configuration success");
 
   /** Is configuration changed */
   bool changed = false;
@@ -1369,7 +1369,12 @@ bool Configuration::isPMCorrectionChanged(void) {
  */
 bool Configuration::isPMCorrectionEnabled(void) {
   PMCorrection pmCorrection = getPMCorrection();
-  return pmCorrection.algorithm != PMCorrectionAlgorithm::None;
+  if (pmCorrection.algorithm == PMCorrectionAlgorithm::None ||
+      pmCorrection.algorithm == PMCorrectionAlgorithm::Unknown) {
+    return false;
+  }
+
+  return true;
 }
 
 Configuration::PMCorrection Configuration::getPMCorrection(void) {

src/AgOledDisplay.cpp

@@ -12,7 +12,7 @@
  */
 void OledDisplay::showTempHum(bool hasStatus, char *buf, int buf_size) {
   /** Temperature */
-  float temp = value.getFloat(Measurements::Temperature);
+  float temp = value.getAverage(Measurements::Temperature);
   if (utils::isValidTemperature(temp)) {
     float t = 0.0f;
     if (config.isTemperatureUnitInF()) {
@@ -44,7 +44,7 @@ void OledDisplay::showTempHum(bool hasStatus, char *buf, int buf_size) {
   DISP()->drawUTF8(1, 10, buf);
 
   /** Show humidity */
-  int rhum = (int)value.getFloat(Measurements::Humidity);
+  int rhum = round(value.getAverage(Measurements::Humidity));
   if (utils::isValidHumidity(rhum)) {
     snprintf(buf, buf_size, "%d%%", rhum);
   } else {
@@ -292,7 +292,7 @@ void OledDisplay::showDashboard(const char *status) {
       DISP()->drawUTF8(1, 27, "CO2");
 
       DISP()->setFont(u8g2_font_t0_22b_tf);
-      int co2 = value.get(Measurements::CO2);
+      int co2 = round(value.getAverage(Measurements::CO2));
       if (utils::isValidCO2(co2)) {
         sprintf(strBuf, "%d", co2);
       } else {
@@ -313,11 +313,10 @@ void OledDisplay::showDashboard(const char *status) {
       DISP()->drawStr(55, 27, "PM2.5");
 
       /** Draw PM2.5 value */
-
+      int pm25 = round(value.getAverage(Measurements::PM25));
-      int pm25 = value.get(Measurements::PM25);
       if (utils::isValidPm(pm25)) {
         if (config.hasSensorSHT && config.isPMCorrectionEnabled()) {
-          pm25 = (int)value.getCorrectedPM25(*ag, config);
+          pm25 = round(value.getCorrectedPM25(*ag, config, true));
         }
         if (config.isPmStandardInUSAQI()) {
           sprintf(strBuf, "%d", ag->pms5003.convertPm25ToUsAqi(pm25));
@@ -343,7 +342,7 @@ void OledDisplay::showDashboard(const char *status) {
       DISP()->drawStr(100, 27, "VOC:");
 
       /** Draw tvocIndexvalue */
-      int tvoc = value.get(Measurements::TVOC);
+      int tvoc = round(value.getAverage(Measurements::TVOC));
       if (utils::isValidVOC(tvoc)) {
         sprintf(strBuf, "%d", tvoc);
       } else {
@@ -352,7 +351,7 @@ void OledDisplay::showDashboard(const char *status) {
       DISP()->drawStr(100, 39, strBuf);
 
       /** Draw NOx label */
-      int nox = value.get(Measurements::NOx);
+      int nox = round(value.getAverage(Measurements::NOx));
       DISP()->drawStr(100, 53, "NOx:");
       if (utils::isValidNOx(nox)) {
         sprintf(strBuf, "%d", nox);
@@ -365,7 +364,7 @@ void OledDisplay::showDashboard(const char *status) {
     ag->display.clear();
 
     /** Set CO2 */
-    int co2 = value.get(Measurements::CO2);
+    int co2 = round(value.getAverage(Measurements::CO2));
     if (utils::isValidCO2(co2)) {
       snprintf(strBuf, sizeof(strBuf), "CO2:%d", co2);
     } else {
@@ -376,9 +375,9 @@ void OledDisplay::showDashboard(const char *status) {
     ag->display.setText(strBuf);
 
     /** Set PM */
-    int pm25 = value.get(Measurements::PM25);
+    int pm25 = round(value.getAverage(Measurements::PM25));
     if (config.hasSensorSHT && config.isPMCorrectionEnabled()) {
-      pm25 = (int)value.getCorrectedPM25(*ag, config);
+      pm25 = round(value.getCorrectedPM25(*ag, config, true));
     }
 
     ag->display.setCursor(0, 12);
@@ -390,12 +389,12 @@ void OledDisplay::showDashboard(const char *status) {
     ag->display.setText(strBuf);
 
     /** Set temperature and humidity */
-    float temp = value.getFloat(Measurements::Temperature);
+    float temp = value.getAverage(Measurements::Temperature);
     if (utils::isValidTemperature(temp)) {
       if (config.isTemperatureUnitInF()) {
         snprintf(strBuf, sizeof(strBuf), "T:%0.1f F", utils::degreeC_To_F(temp));
       } else {
-        snprintf(strBuf, sizeof(strBuf), "T:%0.f1 C", temp);
+        snprintf(strBuf, sizeof(strBuf), "T:%0.1f C", temp);
       }
     } else {
       if (config.isTemperatureUnitInF()) {
@@ -408,7 +407,7 @@ void OledDisplay::showDashboard(const char *status) {
     ag->display.setCursor(0, 24);
     ag->display.setText(strBuf);
 
-    int rhum = (int)value.getFloat(Measurements::Humidity);
+    int rhum = round(value.getAverage(Measurements::Humidity));
     if (utils::isValidHumidity(rhum)) {
       snprintf(strBuf, sizeof(strBuf), "H:%d %%", rhum);
     } else {

src/AgStateMachine.cpp

@@ -13,6 +13,7 @@
 #define RGB_COLOR_Y 255, 150, 0  /** Yellow */
 #define RGB_COLOR_O 255, 40, 0  /** Orange */
 #define RGB_COLOR_P 180, 0, 255 /** Purple */
+#define RGB_COLOR_CLEAR 0, 0, 0 /** No color */
 
 /**
  * @brief Animation LED bar with color
@@ -47,55 +48,76 @@ void StateMachine::ledStatusBlinkDelay(uint32_t ms) {
 }
 
 /**
- * @brief Led bar show led color status
+ * @brief Led bar show PM or CO2 led color status
  *
+ * @return true if all led bar are used, false othwerwise 
  */
-void StateMachine::sensorhandleLeds(void) {
+bool StateMachine::sensorhandleLeds(void) {
+  int totalLedUsed = 0;
   switch (config.getLedBarMode()) {
   case LedBarMode::LedBarModeCO2:
-    co2handleLeds();
+    totalLedUsed = co2handleLeds();
     break;
   case LedBarMode::LedBarModePm:
-    pm25handleLeds();
+    totalLedUsed = pm25handleLeds();
     break;
   default:
     ag->ledBar.clear();
     break;
   }
+
+  if (totalLedUsed == ag->ledBar.getNumberOfLeds()) {
+    return true;
+  }
+
+  // Clear the rest of unused led
+  int startIndex = totalLedUsed + 1;
+  for (int i = startIndex; i <= ag->ledBar.getNumberOfLeds(); i++) {
+    ag->ledBar.setColor(RGB_COLOR_CLEAR, ag->ledBar.getNumberOfLeds() - i);
+  }
+
+  return false;
 }
 
 /**
  * @brief Show CO2 LED status
  *
+ * @return return total number of led that are used on the monitor 
  */
-void StateMachine::co2handleLeds(void) {
+int StateMachine::co2handleLeds(void) {
-  int co2Value = value.get(Measurements::CO2);
+  int totalUsed = ag->ledBar.getNumberOfLeds();
-  if (co2Value <= 700) {
+  int co2Value = round(value.getAverage(Measurements::CO2));
+  if (co2Value <= 600) {
     /** G; 1 */
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 1);
-  } else if (co2Value <= 1000) {
+    totalUsed = 1;
+  } else if (co2Value <= 800) {
     /** GG; 2 */
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 2);
-  } else if (co2Value <= 1333) {
+    totalUsed = 2;
+  } else if (co2Value <= 1000) {
     /** YYY; 3 */
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 2);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 3);
-  } else if (co2Value <= 1666) {
+    totalUsed = 3;
+  } else if (co2Value <= 1250) {
     /** OOOO; 4 */
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 1);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 1);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 2);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 2);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 3);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 3);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 4);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 4);
-  } else if (co2Value <= 2000) {
+    totalUsed = 4;
+  } else if (co2Value <= 1500) {
     /** OOOOO; 5 */
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 1);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 1);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 2);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 2);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 3);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 3);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 4);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 4);
-    ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 5);
+    ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 5);
-  } else if (co2Value <= 2666) {
+    totalUsed = 5;
+  } else if (co2Value <= 1750) {
     /** RRRRRR; 6 */
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 2);
@@ -103,7 +125,8 @@ void StateMachine::co2handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 4);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 5);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 6);
-  } else if (co2Value <= 3333) {
+    totalUsed = 6;
+  } else if (co2Value <= 2000) {
     /** RRRRRRR; 7 */
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 2);
@@ -112,17 +135,19 @@ void StateMachine::co2handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 5);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 6);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 7);
-  } else if (co2Value <= 4000) {
+    totalUsed = 7;
-    /** RRRRRRRR; 8 */
+  } else if (co2Value <= 3000) {
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 1);
+    /** PPPPPPPP; 8 */
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 2);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 1);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 3);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 2);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 4);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 3);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 5);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 4);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 6);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 5);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 7);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 6);
-    ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 8);
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 7);
-  } else { /** > 4000 */
+    ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 8);
+    totalUsed = 8;
+  } else { /** > 3000 */
     /* PRPRPRPRP; 9 */
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 2);
@@ -133,37 +158,47 @@ void StateMachine::co2handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 7);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 8);
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 9);
+    totalUsed = 9;
   }
+
+  return totalUsed;
 }
 
 /**
  * @brief Show PM2.5 LED status
- *
+ * 
+ * @return return total number of led that are used on the monitor 
  */
-void StateMachine::pm25handleLeds(void) {
+int StateMachine::pm25handleLeds(void) {
-  int pm25Value = value.get(Measurements::PM25);
+  int totalUsed = ag->ledBar.getNumberOfLeds();
+
+  int pm25Value = round(value.getAverage(Measurements::PM25));
   if (config.hasSensorSHT && config.isPMCorrectionEnabled()) {
-    pm25Value = (int)value.getCorrectedPM25(*ag, config);
+    pm25Value = round(value.getCorrectedPM25(*ag, config, true));
   }
 
   if (pm25Value <= 5) {
     /** G; 1 */
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 1);
+    totalUsed = 1;
   } else if (pm25Value <= 9) {
     /** GG; 2 */
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_G, ag->ledBar.getNumberOfLeds() - 2);
+    totalUsed = 2;
   } else if (pm25Value <= 20) {
     /** YYY; 3 */
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 2);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 3);
+    totalUsed = 3;
   } else if (pm25Value <= 35) {
     /** YYYY; 4 */
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 1);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 2);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 3);
     ag->ledBar.setColor(RGB_COLOR_Y, ag->ledBar.getNumberOfLeds() - 4);
+    totalUsed = 4;
   } else if (pm25Value <= 45) {
     /** OOOOO; 5 */
     ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 1);
@@ -171,6 +206,7 @@ void StateMachine::pm25handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 3);
     ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 4);
     ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 5);
+    totalUsed = 5;
   } else if (pm25Value <= 55) {
     /** OOOOOO; 6 */
     ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 1);
@@ -179,6 +215,7 @@ void StateMachine::pm25handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 4);
     ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 5);
     ag->ledBar.setColor(RGB_COLOR_O, ag->ledBar.getNumberOfLeds() - 6);
+    totalUsed = 6;
   } else if (pm25Value <= 100) {
     /** RRRRRRR; 7 */
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 1);
@@ -188,6 +225,7 @@ void StateMachine::pm25handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 5);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 6);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 7);
+    totalUsed = 7;
   } else if (pm25Value <= 125) {
     /** RRRRRRRR; 8 */
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 1);
@@ -198,6 +236,7 @@ void StateMachine::pm25handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 6);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 7);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 8);
+    totalUsed = 8;
   } else if (pm25Value <= 225) {
     /** PPPPPPPPP; 9 */
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 1);
@@ -209,6 +248,7 @@ void StateMachine::pm25handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 7);
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 8);
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 9);
+    totalUsed = 9;
   } else { /** > 225 */
     /* PRPRPRPRP; 9 */
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 1);
@@ -220,7 +260,10 @@ void StateMachine::pm25handleLeds(void) {
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 7);
     ag->ledBar.setColor(RGB_COLOR_R, ag->ledBar.getNumberOfLeds() - 8);
     ag->ledBar.setColor(RGB_COLOR_P, ag->ledBar.getNumberOfLeds() - 9);
+    totalUsed = 9;
   }
+
+  return totalUsed;
 }
 
 void StateMachine::co2Calibration(void) {
@@ -311,6 +354,7 @@ void StateMachine::co2Calibration(void) {
 void StateMachine::ledBarTest(void) {
   if (config.isLedBarTestRequested()) {
     if (ag->isOne()) {
+      ag->ledBar.clear();
       if (config.getCountry() == "TH") {
         uint32_t tstart = millis();
         logInfo("Start run LED test for 2 min");
@@ -332,7 +376,12 @@ void StateMachine::ledBarTest(void) {
   }
 }
 
-void StateMachine::ledBarPowerUpTest(void) { ledBarRunTest(); }
+void StateMachine::ledBarPowerUpTest(void) { 
+  if (ag->isOne()) {
+    ag->ledBar.clear();
+  }
+  ledBarRunTest(); 
+}
 
 void StateMachine::ledBarRunTest(void) {
   if (ag->isOne()) {
@@ -585,15 +634,13 @@ void StateMachine::handleLeds(AgStateMachineState state) {
   }
 
   ledState = state;
-  if (ag->isOne()) {
-    ag->ledBar.clear(); // Set all LED OFF
-  }
   switch (state) {
   case AgStateMachineWiFiManagerMode: {
     /** In WiFi Manager Mode */
     /** Turn LED OFF */
     /** Turn middle LED Color */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ag->ledBar.setColor(0, 0, 255, ag->ledBar.getNumberOfLeds() / 2);
     } else {
       ag->statusLed.setToggle();
@@ -603,6 +650,7 @@ void StateMachine::handleLeds(AgStateMachineState state) {
   case AgStateMachineWiFiManagerPortalActive: {
     /** WiFi Manager has connected to mobile phone */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ag->ledBar.setColor(0, 0, 255);
     } else {
       ag->statusLed.setOn();
@@ -613,6 +661,7 @@ void StateMachine::handleLeds(AgStateMachineState state) {
     /** after SSID and PW entered and OK clicked, connection to WiFI network is
      * attempted */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ledBarSingleLedAnimation(255, 255, 255);
     } else {
       ag->statusLed.setOff();
@@ -622,6 +671,7 @@ void StateMachine::handleLeds(AgStateMachineState state) {
   case AgStateMachineWiFiManagerStaConnected: {
     /** Connecting to WiFi worked */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ag->ledBar.setColor(255, 255, 255);
     } else {
       ag->statusLed.setOff();
@@ -631,6 +681,7 @@ void StateMachine::handleLeds(AgStateMachineState state) {
   case AgStateMachineWiFiOkServerConnecting: {
     /** once connected to WiFi an attempt to reach the server is performed */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ledBarSingleLedAnimation(0, 255, 0);
     } else {
       ag->statusLed.setOff();
@@ -640,6 +691,7 @@ void StateMachine::handleLeds(AgStateMachineState state) {
   case AgStateMachineWiFiOkServerConnected: {
     /** Server is reachable, all fine */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ag->ledBar.setColor(0, 255, 0);
     } else {
       ag->statusLed.setOff();
@@ -656,6 +708,7 @@ void StateMachine::handleLeds(AgStateMachineState state) {
   case AgStateMachineWiFiManagerConnectFailed: {
     /** Cannot connect to WiFi (e.g. wrong password, WPA Enterprise etc.) */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ag->ledBar.setColor(255, 0, 0);
     } else {
       ag->statusLed.setOff();
@@ -674,6 +727,7 @@ void StateMachine::handleLeds(AgStateMachineState state) {
     /** Connected to WiFi but server not reachable, e.g. firewall block/
      * whitelisting needed etc. */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ag->ledBar.setColor(233, 183, 54); /** orange */
     } else {
       ag->statusLed.setOff();
@@ -690,6 +744,7 @@ void StateMachine::handleLeds(AgStateMachineState state) {
   case AgStateMachineWiFiOkServerOkSensorConfigFailed: {
     /** Server reachable but sensor not configured correctly */
     if (ag->isOne()) {
+      ag->ledBar.clear();
       ag->ledBar.setColor(139, 24, 248); /** violet */
     } else {
       ag->statusLed.setOff();
@@ -707,11 +762,10 @@ void StateMachine::handleLeds(AgStateMachineState state) {
     /** Connection to WiFi network failed credentials incorrect encryption not
      * supported etc. */
     if (ag->isOne()) {
-      /** WIFI failed status LED color */
+      bool allUsed = sensorhandleLeds();
-      ag->ledBar.setColor(255, 0, 0, 0);
+      if (allUsed == false) {
-      /** Show CO2 or PM color status */
+        ag->ledBar.setColor(255, 0, 0, 0);
-      // sensorLedColorHandler();
+      }
-      sensorhandleLeds();
     } else {
       ag->statusLed.setOff();
     }
@@ -721,11 +775,10 @@ void StateMachine::handleLeds(AgStateMachineState state) {
     /** Connected to WiFi network but the server cannot be reached through the
      * internet, e.g. blocked by firewall */
     if (ag->isOne()) {
-      ag->ledBar.setColor(233, 183, 54, 0);
+      bool allUsed = sensorhandleLeds();
-
+      if (allUsed == false) {
-      /** Show CO2 or PM color status */
+        ag->ledBar.setColor(233, 183, 54, 0);
-      sensorhandleLeds();
+      }
-      // sensorLedColorHandler();
     } else {
       ag->statusLed.setOff();
     }
@@ -735,10 +788,10 @@ void StateMachine::handleLeds(AgStateMachineState state) {
     /** Server is reachable but there is some configuration issue to be fixed on
      * the server side */
     if (ag->isOne()) {
-      ag->ledBar.setColor(139, 24, 248, 0);
+      bool allUsed = sensorhandleLeds();
-
+      if (allUsed == false) {
-      /** Show CO2 or PM color status */
+        ag->ledBar.setColor(139, 24, 248, 0);
-      sensorhandleLeds();
+      }
     } else {
       ag->statusLed.setOff();
     }

src/AgStateMachine.h

@@ -24,9 +24,9 @@ private:
 
   void ledBarSingleLedAnimation(uint8_t r, uint8_t g, uint8_t b);
   void ledStatusBlinkDelay(uint32_t delay);
-  void sensorhandleLeds(void);
+  bool sensorhandleLeds(void);
-  void co2handleLeds(void);
+  int co2handleLeds(void);
-  void pm25handleLeds(void);
+  int pm25handleLeds(void);
   void co2Calibration(void);
   void ledBarTest(void);
   void ledBarPowerUpTest(void);

src/AgValue.cpp

@@ -27,6 +27,12 @@
 #define json_prop_noxRaw "noxRaw"
 #define json_prop_co2 "rco2"
 
+Measurements::Measurements() {
+#ifndef ESP8266
+  _resetReason = (int)ESP_RST_UNKNOWN;
+#endif
+}
+
 void Measurements::maxPeriod(MeasurementType type, int max) {
   switch (type) {
   case Temperature:
@@ -189,7 +195,7 @@ bool Measurements::update(MeasurementType type, int val, int ch) {
 
   // Sanity check if measurement type is defined for integer data type or not
   if (temporary == nullptr) {
-    Serial.printf("%s is not defined for integer data type\n", measurementTypeStr(type));
+    Serial.printf("%s is not defined for integer data type\n", measurementTypeStr(type).c_str());
     // TODO: Just assert?
     return false;
   }
@@ -228,7 +234,7 @@ bool Measurements::update(MeasurementType type, int val, int ch) {
   // Calculate average based on how many elements on the list
   temporary->update.avg = temporary->sumValues / (float)temporary->listValues.size();
   if (_debug) {
-    Serial.printf("%s{%d}: %.2f\n", measurementTypeStr(type), ch, temporary->update.avg);
+    Serial.printf("%s{%d}: %.2f\n", measurementTypeStr(type).c_str(), ch, temporary->update.avg);
   }
 
   return true;
@@ -260,7 +266,7 @@ bool Measurements::update(MeasurementType type, float val, int ch) {
 
   // Sanity check if measurement type is defined for float data type or not
   if (temporary == nullptr) {
-    Serial.printf("%s is not defined for float data type\n", measurementTypeStr(type));
+    Serial.printf("%s is not defined for float data type\n", measurementTypeStr(type).c_str());
     // TODO: Just assert?
     return false;
   }
@@ -299,7 +305,7 @@ bool Measurements::update(MeasurementType type, float val, int ch) {
   // Calculate average based on how many elements on the list
   temporary->update.avg = temporary->sumValues / (float)temporary->listValues.size();
   if (_debug) {
-    Serial.printf("%s{%d}: %.2f\n", measurementTypeStr(type), ch, temporary->update.avg);
+    Serial.printf("%s{%d}: %.2f\n", measurementTypeStr(type).c_str(), ch, temporary->update.avg);
   }
 
   return true;
@@ -348,7 +354,7 @@ int Measurements::get(MeasurementType type, int ch) {
 
   // Sanity check if measurement type is defined for integer data type or not
   if (temporary == nullptr) {
-    Serial.printf("%s is not defined for integer data type\n", measurementTypeStr(type));
+    Serial.printf("%s is not defined for integer data type\n", measurementTypeStr(type).c_str());
     // TODO: Just assert?
     return false;
   }
@@ -383,7 +389,7 @@ float Measurements::getFloat(MeasurementType type, int ch) {
 
   // Sanity check if measurement type is defined for float data type or not
   if (temporary == nullptr) {
-    Serial.printf("%s is not defined for float data type\n", measurementTypeStr(type));
+    Serial.printf("%s is not defined for float data type\n", measurementTypeStr(type).c_str());
     // TODO: Just assert?
     return false;
   }
@@ -396,6 +402,52 @@ float Measurements::getFloat(MeasurementType type, int ch) {
   return temporary->listValues.back();
 }
 
+float Measurements::getAverage(MeasurementType type, int ch) {
+  // Sanity check to validate channel, assert if invalid
+  validateChannel(ch);
+
+  // Follow array indexing just for get address of the value type
+  ch = ch - 1;
+
+  // Define data point source. Data type doesn't matter because only to get the average value
+  FloatValue *temporary = nullptr;
+  Update update;
+  float measurementAverage;
+  switch (type) {
+  case CO2:
+    measurementAverage = _co2.update.avg;
+    break;
+  case TVOC:
+    measurementAverage = _tvoc.update.avg;
+    break;
+  case NOx:
+    measurementAverage = _nox.update.avg;
+    break;
+  case PM25:
+    measurementAverage = _pm_25[ch].update.avg;
+    break;
+  case Temperature:
+    measurementAverage = _temperature[ch].update.avg;
+    break;
+  case Humidity:
+    measurementAverage = _humidity[ch].update.avg;
+    break;
+  default:
+    // Invalidate, measurements type not handled
+    measurementAverage = -1000;
+    break;
+  };
+
+  // Sanity check if measurement type is not defined 
+  if (measurementAverage == -1000) {
+    Serial.printf("ERROR! %s is not defined on get average value function\n", measurementTypeStr(type).c_str());
+    delay(1000);
+    assert(0);
+  }
+
+  return measurementAverage; 
+}
+
 String Measurements::pms5003FirmwareVersion(int fwCode) {
   return pms5003FirmwareVersionBase("PMS5003x", fwCode);
 }
@@ -485,11 +537,12 @@ void Measurements::validateChannel(int ch) {
 
 float Measurements::getCorrectedPM25(AirGradient &ag, Configuration &config, bool useAvg, int ch) {
   float pm25;
+  float corrected;
   float humidity;
   float pm003Count;
-  int channel = ch - 1; // Array index
   if (useAvg) {
     // Directly call from the index
+    int channel = ch - 1; // Array index
     pm25 = _pm_25[channel].update.avg;
     humidity = _humidity[channel].update.avg;
     pm003Count = _pm_03_pc[channel].update.avg;
@@ -500,19 +553,27 @@ float Measurements::getCorrectedPM25(AirGradient &ag, Configuration &config, boo
   }
 
   Configuration::PMCorrection pmCorrection = config.getPMCorrection();
-  if (pmCorrection.algorithm == PMCorrectionAlgorithm::EPA_2021) {
+  switch (pmCorrection.algorithm) {
-    // EPA correction directly applied
+  case PMCorrectionAlgorithm::Unknown:
-    pm25 = ag.pms5003.compensate(pm25, humidity);
+  case PMCorrectionAlgorithm::None:
-  } else {
+    // If correction is Unknown, then default is None
-    // SLR correction, this is assumes before calling this function, correction algorithm is not None
+    corrected = pm25;
-    pm25 = ag.pms5003.slrCorrection(pm25, pm003Count, pmCorrection.scalingFactor, pmCorrection.intercept);
+    break;
+  case PMCorrectionAlgorithm::EPA_2021:
+    corrected = ag.pms5003.compensate(pm25, humidity);
+    break;
+  default: {
+    // All SLR correction using the same flow, hence default condition
+    corrected = ag.pms5003.slrCorrection(pm25, pm003Count, pmCorrection.scalingFactor,
+                                    pmCorrection.intercept);
     if (pmCorrection.useEPA) {
       // Add EPA compensation on top of SLR
-      pm25 = ag.pms5003.compensate(pm25, humidity);
+      corrected = ag.pms5003.compensate(corrected, humidity);
     }
   }
+  }
 
-  return pm25;
+  return corrected;
 }
 
 String Measurements::toString(bool localServer, AgFirmwareMode fwMode, int rssi, AirGradient &ag,
@@ -546,8 +607,8 @@ String Measurements::toString(bool localServer, AgFirmwareMode fwMode, int rssi,
     }
   }
 
-  root["boot"] = bootCount;
+  root["boot"] = _bootCount;
-  root["bootCount"] = bootCount;
+  root["bootCount"] = _bootCount;
   root["wifi"] = rssi;
 
   if (localServer) {
@@ -557,6 +618,11 @@ String Measurements::toString(bool localServer, AgFirmwareMode fwMode, int rssi,
     root["serialno"] = ag.deviceId();
     root["firmware"] = ag.getVersion();
     root["model"] = AgFirmwareModeName(fwMode);
+  } else {
+#ifndef ESP8266
+    root["resetReason"] = _resetReason;
+    root["freeHeap"] = ESP.getFreeHeap();
+#endif
   }
 
   String result = JSON.stringify(root);
@@ -841,10 +907,10 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
     pms[json_prop_pm03Count] = ag.round2(avg);
     pms["channels"]["1"][json_prop_pm03Count] = ag.round2(_pm_03_pc[0].update.avg);
     pms["channels"]["2"][json_prop_pm03Count] = ag.round2(_pm_03_pc[1].update.avg);
-  } else if (utils::isValidPm(_pm_03_pc[0].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_03_pc[0].update.avg)) {
     pms[json_prop_pm03Count] = ag.round2(_pm_03_pc[0].update.avg);
     pms["channels"]["1"][json_prop_pm03Count] = ag.round2(_pm_03_pc[0].update.avg);
-  } else if (utils::isValidPm(_pm_03_pc[1].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_03_pc[1].update.avg)) {
     pms[json_prop_pm03Count] = ag.round2(_pm_03_pc[1].update.avg);
     pms["channels"]["2"][json_prop_pm03Count] = ag.round2(_pm_03_pc[1].update.avg);
   }
@@ -856,10 +922,10 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
     pms[json_prop_pm05Count] = ag.round2(avg);
     pms["channels"]["1"][json_prop_pm05Count] = ag.round2(_pm_05_pc[0].update.avg);
     pms["channels"]["2"][json_prop_pm05Count] = ag.round2(_pm_05_pc[1].update.avg);
-  } else if (utils::isValidPm(_pm_05_pc[0].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_05_pc[0].update.avg)) {
     pms[json_prop_pm05Count] = ag.round2(_pm_05_pc[0].update.avg);
     pms["channels"]["1"][json_prop_pm05Count] = ag.round2(_pm_05_pc[0].update.avg);
-  } else if (utils::isValidPm(_pm_05_pc[1].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_05_pc[1].update.avg)) {
     pms[json_prop_pm05Count] = ag.round2(_pm_05_pc[1].update.avg);
     pms["channels"]["2"][json_prop_pm05Count] = ag.round2(_pm_05_pc[1].update.avg);
   }
@@ -870,10 +936,10 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
     pms[json_prop_pm1Count] = ag.round2(avg);
     pms["channels"]["1"][json_prop_pm1Count] = ag.round2(_pm_01_pc[0].update.avg);
     pms["channels"]["2"][json_prop_pm1Count] = ag.round2(_pm_01_pc[1].update.avg);
-  } else if (utils::isValidPm(_pm_01_pc[0].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_01_pc[0].update.avg)) {
     pms[json_prop_pm1Count] = ag.round2(_pm_01_pc[0].update.avg);
     pms["channels"]["1"][json_prop_pm1Count] = ag.round2(_pm_01_pc[0].update.avg);
-  } else if (utils::isValidPm(_pm_01_pc[1].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_01_pc[1].update.avg)) {
     pms[json_prop_pm1Count] = ag.round2(_pm_01_pc[1].update.avg);
     pms["channels"]["2"][json_prop_pm1Count] = ag.round2(_pm_01_pc[1].update.avg);
   }
@@ -885,10 +951,10 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
     pms[json_prop_pm25Count] = ag.round2(avg);
     pms["channels"]["1"][json_prop_pm25Count] = ag.round2(_pm_25_pc[0].update.avg);
     pms["channels"]["2"][json_prop_pm25Count] = ag.round2(_pm_25_pc[1].update.avg);
-  } else if (utils::isValidPm(_pm_25_pc[0].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_25_pc[0].update.avg)) {
     pms[json_prop_pm25Count] = ag.round2(_pm_25_pc[0].update.avg);
     pms["channels"]["1"][json_prop_pm25Count] = ag.round2(_pm_25_pc[0].update.avg);
-  } else if (utils::isValidPm(_pm_25_pc[1].update.avg)) {
+  } else if (utils::isValidPm03Count(_pm_25_pc[1].update.avg)) {
     pms[json_prop_pm25Count] = ag.round2(_pm_25_pc[1].update.avg);
     pms["channels"]["2"][json_prop_pm25Count] = ag.round2(_pm_25_pc[1].update.avg);
   }
@@ -1010,4 +1076,50 @@ JSONVar Measurements::buildPMS(AirGradient &ag, int ch, bool allCh, bool withTem
   return pms;
 }
 
-void Measurements::setDebug(bool debug) { _debug = debug; }
+void Measurements::setDebug(bool debug) { _debug = debug; }
+
+int Measurements::bootCount() { return _bootCount; }
+
+void Measurements::setBootCount(int bootCount) { _bootCount = bootCount; }
+
+#ifndef ESP8266
+void Measurements::setResetReason(esp_reset_reason_t reason) {
+  switch (reason) {
+  case ESP_RST_UNKNOWN:
+    Serial.println("Reset reason: ESP_RST_UNKNOWN");
+    break;
+  case ESP_RST_POWERON:
+    Serial.println("Reset reason: ESP_RST_POWERON");
+    break;
+  case ESP_RST_EXT:
+    Serial.println("Reset reason: ESP_RST_EXT");
+    break;
+  case ESP_RST_SW:
+    Serial.println("Reset reason: ESP_RST_SW");
+    break;
+  case ESP_RST_PANIC:
+    Serial.println("Reset reason: ESP_RST_PANIC");
+    break;
+  case ESP_RST_INT_WDT:
+    Serial.println("Reset reason: ESP_RST_INT_WDT");
+    break;
+  case ESP_RST_TASK_WDT:
+    Serial.println("Reset reason: ESP_RST_TASK_WDT");
+    break;
+  case ESP_RST_WDT:
+    Serial.println("Reset reason: ESP_RST_WDT");
+    break;
+  case ESP_RST_BROWNOUT:
+    Serial.println("Reset reason: ESP_RST_BROWNOUT");
+    break;
+  case ESP_RST_SDIO:
+    Serial.println("Reset reason: ESP_RST_SDIO");
+    break;
+  default:
+    Serial.println("Reset reason: unknown");
+    break;
+  }
+
+  _resetReason = (int)reason;
+}
+#endif

src/AgValue.h

@@ -34,7 +34,7 @@ private:
   };
 
 public:
-  Measurements() {}
+  Measurements();
   ~Measurements() {}
 
   // Enumeration for every AG measurements
@@ -114,9 +114,19 @@ public:
    */
   float getFloat(MeasurementType type, int ch = 1);
 
+  /**
+   * @brief Get the target measurement average value
+   *
+   * @param type measurement type that will be retrieve
+   * @param ch target type value channel
+   * @return moving average value of target measurements type  
+   */
+  float getAverage(MeasurementType type, int ch = 1);
 
   /**
    * @brief Get the Corrected PM25 object based on the correction algorithm from configuration
+   * 
+   * If correction is not enabled, then will return the raw value (either average or last value)
    *
    * @param ag AirGradient instance
    * @param config Configuration instance
@@ -137,8 +147,12 @@ public:
    */
   void setDebug(bool debug);
 
-  // TODO: update this to use setter
+  int bootCount();
-  int bootCount;
+  void setBootCount(int bootCount);
+
+#ifndef ESP8266
+  void setResetReason(esp_reset_reason_t reason);
+#endif
 
 private:
   // Some declared as an array (channel), because FW_MODE_O_1PPx has two PMS5003T
@@ -161,7 +175,8 @@ private:
   IntegerValue _pm_25_pc[2]; // particle count 2.5
   IntegerValue _pm_5_pc[2];  // particle count 5.0
   IntegerValue _pm_10_pc[2]; // particle count 10
-
+  int _bootCount;
+  int _resetReason;
   bool _debug = false;
 
   /**

src/AirGradient.h

@@ -15,7 +15,46 @@
 #include "Main/utils.h"
 
 #ifndef GIT_VERSION
-#define GIT_VERSION "3.1.10-snap"
+#define GIT_VERSION "3.1.21-snap"
+#endif
+
+#ifndef ESP8266
+// Airgradient server root ca certificate
+const char *const AG_SERVER_ROOT_CA =
+    "-----BEGIN CERTIFICATE-----\n"
+    "MIIF4jCCA8oCCQD7MgvcaVWxkTANBgkqhkiG9w0BAQsFADCBsjELMAkGA1UEBhMC\n"
+    "VEgxEzARBgNVBAgMCkNoaWFuZyBNYWkxEDAOBgNVBAcMB01hZSBSaW0xGTAXBgNV\n"
+    "BAoMEEFpckdyYWRpZW50IEx0ZC4xFDASBgNVBAsMC1NlbnNvciBMYWJzMSgwJgYD\n"
+    "VQQDDB9BaXJHcmFkaWVudCBTZW5zb3IgTGFicyBSb290IENBMSEwHwYJKoZIhvcN\n"
+    "AQkBFhJjYUBhaXJncmFkaWVudC5jb20wHhcNMjEwOTE3MTE0NDE3WhcNNDEwOTEy\n"
+    "MTE0NDE3WjCBsjELMAkGA1UEBhMCVEgxEzARBgNVBAgMCkNoaWFuZyBNYWkxEDAO\n"
+    "BgNVBAcMB01hZSBSaW0xGTAXBgNVBAoMEEFpckdyYWRpZW50IEx0ZC4xFDASBgNV\n"
+    "BAsMC1NlbnNvciBMYWJzMSgwJgYDVQQDDB9BaXJHcmFkaWVudCBTZW5zb3IgTGFi\n"
+    "cyBSb290IENBMSEwHwYJKoZIhvcNAQkBFhJjYUBhaXJncmFkaWVudC5jb20wggIi\n"
+    "MA0GCSqGSIb3DQEBAQUAA4ICDwAwggIKAoICAQC6XkVQ4O9d5GcUjPYRgF/uaY6O\n"
+    "5ry1xCGvotxkEeKkBk99lB1oNUUfNsP5bwuDci4XKfY9Ro6/jmkfHSVcPAwUnjAt\n"
+    "BcHqZtA/cMXykaynf9yXPxPQN7XLu/Rk32RIfb90sIGS318xgNziCYvzWZmlxpxc\n"
+    "3gUcAgGtamlgZ6wD3yOHVo8B9aFNvmP16QwkUm8fKDHunJG+iX2Bxa4ka5FJovhG\n"
+    "TnUwtso6Vrn0JaWF9qWcPZE0JZMjFW8PYRriyJmHwr/nAXfPPKphD1oRO+oA7/jq\n"
+    "dYkrJw6+OHfFXnPB1xkeh4OPBzcCZHT5XWNfwBYazYpjcJa9ngGFSmg8lX1ac23C\n"
+    "zea1XJmSrPwbZbWxoQznnf7Y78mRjruYKgSP8rf74KYvBe/HGPL5NQyXQ3l6kwmu\n"
+    "CCUqfcC0wCWEtWESxwSdFE2qQii8CZ12kQExzvR2PrOIyKQYSdkGx9/RBZtAVPXP\n"
+    "hmLuRBQYHrF5Cxf1oIbBK8OMoNVgBm6ftt15t9Sq9dH5Aup2YR6WEJkVaYkYzZzK\n"
+    "X7M+SQcdbXp+hAO8PFpABJxkaDAO2kiB5Ov7pDYPAcmNFqnJT48AY0TZJeVeCa5W\n"
+    "sIv3lPvB/XcFjP0+aZxxNSEEwpGPUYgvKUYUUmb0NammlYQwZHKaShPEmZ3UZ0bp\n"
+    "VNt4p6374nzO376sSwIDAQABMA0GCSqGSIb3DQEBCwUAA4ICAQB/LfBPgTx7xKQB\n"
+    "JNMUhah17AFAn050NiviGJOHdPQely6u3DmJGg+ijEVlPWO1FEW3it+LOuNP5zOu\n"
+    "bhq8paTYIxPxtALIxw5ksykX9woDuX3H6FF9mPdQIbL7ft+3ZtZ4FWPui9dUtaPe\n"
+    "ZBmDFDi4U29nhWZK68JSp5QkWjfaYLV/vtag7120eVyGEPFZ0UAuTUNqpw+stOt9\n"
+    "gJ2ZxNx13xJ8ZnLK7qz1crPe8/8IVAdxbVLoY7JaWPLc//+VF+ceKicy8+4gV7zN\n"
+    "Gnq2IyM+CHFz8VYMLbW+3eVp4iJjTa72vae116kozboEIUVN9rgLqIKyVqQXiuoN\n"
+    "g3xY+yfncPB2+H/+lfyy6mepPIfgksd3+KeNxFADSc5EVY2JKEdorRodnAh7a8K6\n"
+    "WjTYgq+GjWXU2uQW2SyPt6Tu33OT8nBnu3NB80eT8WXgdVCkgsuyCuLvNRf1Xmze\n"
+    "igvurpU6JmQ1GlLgLJo8omJHTh1zIbkR9injPYne2v9ciHCoP6+LDEqe+rOsvPCB\n"
+    "C/o/iZ4svmYX4fWGuU7GgqZE8hhrC3+GdOTf2ADC752cYCZxBidXGtkrGNoHQKmQ\n"
+    "KCOMFBxZIvWteB3tUo3BKYz1D2CvKWz1wV4moc5JHkOgS+jqxhvOkQ/vfQBQ1pUY\n"
+    "TMui9BSwU7B1G2XjdLbfF3Dc67zaSg==\n"
+    "-----END CERTIFICATE-----\n";
 #endif
 
 /**

src/OtaHandler.cpp

@@ -0,0 +1,171 @@
+#include "OtaHandler.h"
+
+#ifndef ESP8266 // Only for esp32 based mcu
+
+#include "AirGradient.h"
+
+void OtaHandler::setHandlerCallback(OtaHandlerCallback_t callback) { _callback = callback; }
+
+void OtaHandler::updateFirmwareIfOutdated(String deviceId) {
+  String url =
+      "https://hw.airgradient.com/sensors/airgradient:" + deviceId + "/generic/os/firmware.bin";
+  url += "?current_firmware=";
+  url += GIT_VERSION;
+  char urlAsChar[URL_BUF_SIZE];
+  url.toCharArray(urlAsChar, URL_BUF_SIZE);
+  Serial.printf("checking for new OTA update @ %s\n", urlAsChar);
+
+  esp_http_client_config_t config = {};
+  config.url = urlAsChar;
+  config.cert_pem = AG_SERVER_ROOT_CA;
+  OtaUpdateOutcome ret = attemptToPerformOta(&config);
+  Serial.println(ret);
+  if (_callback) {
+    switch (ret) {
+    case OtaUpdateOutcome::UPDATE_PERFORMED:
+      _callback(OtaState::OTA_STATE_SUCCESS, "");
+      break;
+    case OtaUpdateOutcome::UPDATE_SKIPPED:
+      _callback(OtaState::OTA_STATE_SKIP, "");
+      break;
+    case OtaUpdateOutcome::ALREADY_UP_TO_DATE:
+      _callback(OtaState::OTA_STATE_UP_TO_DATE, "");
+      break;
+    case OtaUpdateOutcome::UPDATE_FAILED:
+      _callback(OtaState::OTA_STATE_FAIL, "");
+      break;
+    default:
+      break;
+    }
+  }
+}
+
+OtaHandler::OtaUpdateOutcome
+OtaHandler::attemptToPerformOta(const esp_http_client_config_t *config) {
+  esp_http_client_handle_t client = esp_http_client_init(config);
+  if (client == NULL) {
+    Serial.println("Failed to initialize HTTP connection");
+    return OtaUpdateOutcome::UPDATE_FAILED;
+  }
+
+  esp_err_t err = esp_http_client_open(client, 0);
+  if (err != ESP_OK) {
+    esp_http_client_cleanup(client);
+    Serial.printf("Failed to open HTTP connection: %s\n", esp_err_to_name(err));
+    return OtaUpdateOutcome::UPDATE_FAILED;
+  }
+  esp_http_client_fetch_headers(client);
+
+  int httpStatusCode = esp_http_client_get_status_code(client);
+  if (httpStatusCode == 304) {
+    Serial.println("Firmware is already up to date");
+    cleanupHttp(client);
+    return OtaUpdateOutcome::ALREADY_UP_TO_DATE;
+  } else if (httpStatusCode != 200) {
+    Serial.printf("Firmware update skipped, the server returned %d\n", httpStatusCode);
+    cleanupHttp(client);
+    return OtaUpdateOutcome::UPDATE_SKIPPED;
+  }
+
+  esp_ota_handle_t update_handle = 0;
+  const esp_partition_t *update_partition = NULL;
+  Serial.println("Starting OTA update ...");
+  update_partition = esp_ota_get_next_update_partition(NULL);
+  if (update_partition == NULL) {
+    Serial.println("Passive OTA partition not found");
+    cleanupHttp(client);
+    return OtaUpdateOutcome::UPDATE_FAILED;
+  }
+  Serial.printf("Writing to partition subtype %d at offset 0x%x\n", update_partition->subtype,
+                update_partition->address);
+
+  err = esp_ota_begin(update_partition, OTA_SIZE_UNKNOWN, &update_handle);
+  if (err != ESP_OK) {
+    Serial.printf("esp_ota_begin failed, error=%d\n", err);
+    cleanupHttp(client);
+    return OtaUpdateOutcome::UPDATE_FAILED;
+  }
+
+  esp_err_t ota_write_err = ESP_OK;
+  char *upgrade_data_buf = (char *)malloc(OTA_BUF_SIZE);
+  if (!upgrade_data_buf) {
+    Serial.println("Couldn't allocate memory for data buffer");
+    return OtaUpdateOutcome::UPDATE_FAILED;
+  }
+
+  int binary_file_len = 0;
+  int totalSize = esp_http_client_get_content_length(client);
+  Serial.println("File size: " + String(totalSize) + String(" bytes"));
+
+  // Show display start update new firmware.
+  if (_callback) {
+    _callback(OtaState::OTA_STATE_BEGIN, "");
+  }
+
+  // Download file and write new firmware to OTA partition
+  uint32_t lastUpdate = millis();
+  while (1) {
+    int data_read = esp_http_client_read(client, upgrade_data_buf, OTA_BUF_SIZE);
+    if (data_read == 0) {
+      if (_callback) {
+        _callback(OtaState::OTA_STATE_PROCESSING, String(100));
+      }
+      Serial.println("Connection closed, all data received");
+      break;
+    }
+    if (data_read < 0) {
+      Serial.println("Data read error");
+      if (_callback) {
+        _callback(OtaState::OTA_STATE_FAIL, "");
+      }
+      break;
+    }
+    if (data_read > 0) {
+      ota_write_err = esp_ota_write(update_handle, (const void *)upgrade_data_buf, data_read);
+      if (ota_write_err != ESP_OK) {
+        if (_callback) {
+          _callback(OtaState::OTA_STATE_FAIL, "");
+        }
+        break;
+      }
+      binary_file_len += data_read;
+
+      int percent = (binary_file_len * 100) / totalSize;
+      uint32_t ms = (uint32_t)(millis() - lastUpdate);
+      if (ms >= 250) {
+        // sm.executeOTA(StateMachine::OtaState::OTA_STATE_PROCESSING, "",
+        //               percent);
+        if (_callback) {
+          _callback(OtaState::OTA_STATE_PROCESSING, String(percent));
+        }
+        lastUpdate = millis();
+      }
+    }
+  }
+  free(upgrade_data_buf);
+  cleanupHttp(client);
+  Serial.printf("# of bytes written: %d\n", binary_file_len);
+
+  esp_err_t ota_end_err = esp_ota_end(update_handle);
+  if (ota_write_err != ESP_OK) {
+    Serial.printf("Error: esp_ota_write failed! err=0x%d\n", err);
+    return OtaUpdateOutcome::UPDATE_FAILED;
+  } else if (ota_end_err != ESP_OK) {
+    Serial.printf("Error: esp_ota_end failed! err=0x%d. Image is invalid", ota_end_err);
+    return OtaUpdateOutcome::UPDATE_FAILED;
+  }
+
+  err = esp_ota_set_boot_partition(update_partition);
+  if (err != ESP_OK) {
+    Serial.printf("esp_ota_set_boot_partition failed! err=0x%d\n", err);
+    return OtaUpdateOutcome::UPDATE_FAILED;
+  }
+  return OtaUpdateOutcome::UPDATE_PERFORMED;
+}
+
+void OtaHandler::cleanupHttp(esp_http_client_handle_t client) {
+  esp_http_client_close(client);
+  esp_http_client_cleanup(client);
+}
+
+#endif

src/OtaHandler.h

@@ -0,0 +1,43 @@
+#ifndef OTA_HANDLER_H
+#define OTA_HANDLER_H
+#ifndef ESP8266 // Only for esp32 based mcu
+
+#include <Arduino.h>
+#include <esp_err.h>
+#include <esp_http_client.h>
+#include <esp_ota_ops.h>
+
+#define OTA_BUF_SIZE 1024
+#define URL_BUF_SIZE 256
+
+class OtaHandler {
+public:
+  enum OtaState {
+    OTA_STATE_BEGIN,
+    OTA_STATE_FAIL,
+    OTA_STATE_SKIP,
+    OTA_STATE_UP_TO_DATE,
+    OTA_STATE_PROCESSING,
+    OTA_STATE_SUCCESS
+  };
+
+  typedef void (*OtaHandlerCallback_t)(OtaState state, String message);
+  void setHandlerCallback(OtaHandlerCallback_t callback);
+  void updateFirmwareIfOutdated(String deviceId);
+
+private:
+  OtaHandlerCallback_t _callback;
+
+  enum OtaUpdateOutcome {
+    UPDATE_PERFORMED = 0,
+    ALREADY_UP_TO_DATE,
+    UPDATE_FAILED,
+    UPDATE_SKIPPED
+  }; // Internal use
+
+  OtaUpdateOutcome attemptToPerformOta(const esp_http_client_config_t *config);
+  void cleanupHttp(esp_http_client_handle_t client);
+};
+
+#endif // ESP8266
+#endif //  OTA_HANDLER_H