diff --git a/examples/OneOpenAir/OneOpenAir.ino b/examples/OneOpenAir/OneOpenAir.ino
index 85db0da..3619c75 100644
--- a/examples/OneOpenAir/OneOpenAir.ino
+++ b/examples/OneOpenAir/OneOpenAir.ino
@@ -38,7 +38,6 @@ CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 #include "Arduino.h"
 #include "EEPROM.h"
 #include "ESPmDNS.h"
-#include "Libraries/airgradient-ota/src/airgradientOta.h"
 #include "LocalServer.h"
 #include "MqttClient.h"
 #include "OpenMetrics.h"
@@ -54,6 +53,7 @@ CC BY-SA 4.0 Attribution-ShareAlike 4.0 International License
 #include "Libraries/airgradient-client/src/cellularModuleA7672xx.h"
 #include "Libraries/airgradient-client/src/airgradientCellularClient.h"
 #include "Libraries/airgradient-client/src/airgradientWifiClient.h"
+#include "Libraries/airgradient-ota/src/airgradientOta.h"
 #include "Libraries/airgradient-ota/src/airgradientOtaWifi.h"
 #include "Libraries/airgradient-ota/src/airgradientOtaCellular.h"
 #include "esp_system.h"
@@ -147,6 +147,7 @@ static void displayExecuteOta(AirgradientOTA::OtaResult result, String msg, int
 static int calculateMaxPeriod(int updateInterval);
 static void setMeasurementMaxPeriod();
 static void newMeasurementCycle();
+static void networkSignalCheck();
 static void networkingTask(void *args);
 
 AgSchedule dispLedSchedule(DISP_UPDATE_INTERVAL, updateDisplayAndLedBar);
@@ -160,6 +161,7 @@ AgSchedule tempHumSchedule(SENSOR_TEMP_HUM_UPDATE_INTERVAL, tempHumUpdate);
 AgSchedule tvocSchedule(SENSOR_TVOC_UPDATE_INTERVAL, updateTvoc);
 AgSchedule watchdogFeedSchedule(60000, wdgFeedUpdate);
 AgSchedule checkForUpdateSchedule(FIRMWARE_CHECK_FOR_UPDATE_MS, checkForFirmwareUpdate);
+AgSchedule networkSignalCheckSchedule(10000, networkSignalCheck);
 
 void setup() {
   /** Serial for print debug message */
@@ -575,6 +577,7 @@ void otaHandlerCallback(AirgradientOTA::OtaResult result, const char *msg) {
     displayExecuteOta(result, fwNewVersion, 0);
     break;
   case AirgradientOTA::InProgress:
+    Serial.printf("OTA progress: %s", msg);
     displayExecuteOta(result, "", std::stoi(msg));
     break;
   case AirgradientOTA::Failed:
@@ -1329,8 +1332,8 @@ void postUsingCellular() {
   }
 
   // Build payload include all measurements from queue
-  String payload;
-  payload += String(CELLULAR_MEASUREMENT_INTERVAL / 1000); // Convert to seconds
+  std::string payload;
+  payload += std::to_string(CELLULAR_MEASUREMENT_INTERVAL / 1000); // Convert to seconds
   for (int i = 0; i < queueSize; i++) {
     auto mc = measurementCycleQueue.at(i);
     payload += ",";
@@ -1341,8 +1344,7 @@ void postUsingCellular() {
   xSemaphoreGive(mutexMeasurementCycleQueue);
 
   // Attempt to send
-  Serial.println(payload);
-  if (agClient->httpPostMeasures(payload.c_str()) == false) {
+  if (agClient->httpPostMeasures(payload) == false) {
     // Consider network has a problem, retry in next schedule 
     Serial.println("Post measures failed, retry in next schedule");
     return;
@@ -1364,7 +1366,7 @@ void sendDataToServer(void) {
 
   if (networkOption == UseWifi) {
     postUsingWifi();
-  } else {
+  } else if (networkOption == UseCellular) {
     postUsingCellular();
   }
 }
@@ -1443,6 +1445,20 @@ int calculateMaxPeriod(int updateInterval) {
   }
 }
 
+
+void networkSignalCheck() {
+  if (networkOption == UseWifi) {
+    Serial.printf("WiFi RSSI %d\n", wifiConnector.RSSI());
+  } else if (networkOption == UseCellular) {
+    auto result = cell->retrieveSignal();
+    if (result.status != CellReturnStatus::Ok) {
+      // TODO: Need to do something when get signal failed
+      return;
+    }
+    Serial.printf("Cellular signal strength %d\n", result.data);
+  }
+}
+
 void networkingTask(void *args) {
   // OTA check on boot
 #ifdef ESP8266
@@ -1453,7 +1469,15 @@ void networkingTask(void *args) {
   checkForUpdateSchedule.update(); 
 #endif
 
-  // TODO: Need to better define delay value
+  // Because cellular interval is longer, needs to send first measures cycle on
+  // boot to indicate that its online
+  if (networkOption == UseCellular) {
+    Serial.println("Prepare first measures cycle to send on boot for 20s");
+    delay(20000);
+    newMeasurementCycle();
+    sendDataToServer();
+    measurementSchedule.update();
+  }
 
   // Reset scheduler
   configSchedule.update();
@@ -1489,6 +1513,7 @@ void networkingTask(void *args) {
     }
 
     // Run scheduler
+    networkSignalCheckSchedule.run();
     configSchedule.run();
     transmissionSchedule.run();
     checkForUpdateSchedule.run();
diff --git a/src/AgValue.cpp b/src/AgValue.cpp
index dc3f58f..fd5e5f0 100644
--- a/src/AgValue.cpp
+++ b/src/AgValue.cpp
@@ -3,6 +3,7 @@
 #include "AirGradient.h"
 #include "App/AppDef.h"
 #include <cmath>
+#include <sstream>
 
 #define json_prop_pmFirmware     "firmware"
 #define json_prop_pm01Ae "pm01"
@@ -733,90 +734,104 @@ Measurements::MeasurementCycle Measurements::getMeasurementCycle() {
   return mc;
 }
 
-String Measurements::buildMeasurementPayload(MeasurementCycle &mc) {
-  String result;
-
-  int co2 = utils::getInvalidCO2();
-  float temp = utils::getInvalidTemperature();
-  float hum = utils::getInvalidHumidity();
-  float pm01 = utils::getInvalidPmValue();
-  float pm25 = utils::getInvalidPmValue();
-  float pm10 = utils::getInvalidPmValue();
-  int nox = utils::getInvalidNOx();
-  int pm003Count = utils::getInvalidPmValue();
+std::string Measurements::buildMeasurementPayload(MeasurementCycle &mc) {
+  std::ostringstream oss;
 
   // CO2
   if (utils::isValidCO2(mc.co2)) {
-    co2 = std::round(mc.co2);
+    oss << std::round(mc.co2);
   }
 
-  // NOx
-  if (utils::isValidNOx(mc.nox)) {
-    nox = std::round(mc.nox);
-  }
+  oss << ",";
 
-  /// Temperature 
+  // Temperature 
   if (utils::isValidTemperature(mc.temperature[0]) && utils::isValidTemperature(mc.temperature[1])) {
-    temp = ag->round2((mc.temperature[0] + mc.temperature[1]) / 2.0f);
+    float temp = (mc.temperature[0] + mc.temperature[1]) / 2.0f;
+    oss << std::round(temp * 10);
   } else if (utils::isValidTemperature(mc.temperature[0])) {
-    temp = ag->round2(mc.temperature[0]);
+    oss << std::round(mc.temperature[0] * 10);
   } else if (utils::isValidTemperature(mc.temperature[1])) {
-    temp = ag->round2(mc.temperature[1]);
+    oss << std::round(mc.temperature[1] * 10);
   }
 
+  oss << ",";
+
   // Humidity
   if (utils::isValidHumidity(mc.humidity[0]) && utils::isValidHumidity(mc.humidity[1])) {
-    hum = ag->round2((mc.humidity[0] + mc.humidity[1]) / 2.0f);
+    float hum = (mc.humidity[0] + mc.humidity[1]) / 2.0f;
+    oss << std::round(hum * 10);
   } else if (utils::isValidHumidity(mc.humidity[0])) {
-    hum = ag->round2(mc.humidity[0]);
+    oss << std::round(mc.humidity[0] * 10);
   } else if (utils::isValidHumidity(mc.humidity[1])) {
-    hum = ag->round2(mc.humidity[1]);
+    oss << std::round(mc.humidity[1] * 10);
   }
 
+  oss << ",";
+
   /// PM1.0 atmospheric environment
   if (utils::isValidPm(mc.pm_01[0]) && utils::isValidPm(mc.pm_01[1])) {
-    pm01 = ag->round2((mc.pm_01[0] + mc.pm_01[1]) / 2.0f);
+    float pm01 = (mc.pm_01[0] + mc.pm_01[1]) / 2.0f;
+    oss << std::round(pm01 * 10);
   } else if (utils::isValidPm(mc.pm_01[0])) {
-    pm01 = ag->round2(mc.pm_01[0]);
+    oss << std::round(mc.pm_01[0] * 10);
   } else if (utils::isValidPm(mc.pm_01[1])) {
-    pm01 = ag->round2(mc.pm_01[1]);
+    oss << std::round(mc.pm_01[1] * 10);
   }
 
+  oss << ",";
+
   /// PM2.5 atmospheric environment
   if (utils::isValidPm(mc.pm_25[0]) && utils::isValidPm(mc.pm_25[1])) {
-    pm25 = ag->round2((mc.pm_25[0] + mc.pm_25[1]) / 2.0f);
+    float pm25 = (mc.pm_25[0] + mc.pm_25[1]) / 2.0f;
+    oss << std::round(pm25 * 10);
   } else if (utils::isValidPm(mc.pm_25[0])) {
-    pm25 = ag->round2(mc.pm_25[0]);
+    oss << std::round(mc.pm_25[0] * 10);
   } else if (utils::isValidPm(mc.pm_25[1])) {
-    pm25 = ag->round2(mc.pm_25[1]);
+    oss << std::round(mc.pm_25[1] * 10);
   }
 
+  oss << ",";
+
   /// PM10 atmospheric environment
   if (utils::isValidPm(mc.pm_10[0]) && utils::isValidPm(mc.pm_10[1])) {
-    pm10 = ag->round2((mc.pm_10[0] + mc.pm_10[1]) / 2.0f);
+    float pm10 = (mc.pm_10[0] + mc.pm_10[1]) / 2.0f;
+    oss << std::round(pm10 * 10);
   } else if (utils::isValidPm(mc.pm_10[0])) {
-    pm10 = ag->round2(mc.pm_10[0]);
+    oss << std::round(mc.pm_10[0] * 10);
   } else if (utils::isValidPm(mc.pm_10[1])) {
-    pm10 = ag->round2(mc.pm_10[1]);
+    oss << std::round(mc.pm_10[1] * 10);
   }
 
+  oss << ",";
+
+  // NOx
+  if (utils::isValidNOx(mc.nox)) {
+    oss << std::round(mc.nox);
+  }
+
+  oss << ",";
+
+  // TVOC
+  if (utils::isValidVOC(mc.tvoc)) {
+    oss << std::round(mc.tvoc);
+  }
+
+  oss << ",";
+
   /// PM 0.3 particle count
   if (utils::isValidPm03Count(mc.pm_03_pc[0]) && utils::isValidPm03Count(mc.pm_03_pc[1])) {
-    pm003Count = std::round((mc.pm_03_pc[0] + mc.pm_03_pc[1]) / 2.0f);
+    oss << std::round((mc.pm_03_pc[0] + mc.pm_03_pc[1]) / 2.0f);
   } else if (utils::isValidPm03Count(mc.pm_03_pc[0])) {
-    pm003Count = std::round(mc.pm_03_pc[0]);
+    oss << std::round(mc.pm_03_pc[0]);
   } else if (utils::isValidPm03Count(mc.pm_03_pc[1])) {
-    pm003Count = std::round(mc.pm_03_pc[1]);
+    oss << std::round(mc.pm_03_pc[1]);
   }
 
-  char datapoint[128] = {0};
-  Serial.printf(datapoint, 128, "%d,%.0f,%.0f,%.0f,%.0f,%.0f,%d,%d\n", co2,
-                temp * 10, hum * 10, pm01 * 10, pm25 * 10, pm10 * 10, nox,
-                pm003Count);
-  snprintf(datapoint, 128, "%d,%.0f,%.0f,%.0f,%.0f,%.0f,%d,%d", co2, temp * 10,
-           hum * 10, pm01 * 10, pm25 * 10, pm10 * 10, nox, pm003Count);
+  // char datapoint[128] = {0};
+  // snprintf(datapoint, 128, "%d,%.0f,%.0f,%.0f,%.0f,%.0f,%d,%d,%d", co2, temp * 10,
+  //          hum * 10, pm01 * 10, pm25 * 10, pm10 * 10, tvoc, nox, pm003Count);
 
-  return String(datapoint);
+  return oss.str();
 }
 
 
diff --git a/src/AgValue.h b/src/AgValue.h
index a0378ab..5edec72 100644
--- a/src/AgValue.h
+++ b/src/AgValue.h
@@ -182,7 +182,7 @@ public:
 
   MeasurementCycle getMeasurementCycle();
 
-  String buildMeasurementPayload(MeasurementCycle &mc);
+  std::string buildMeasurementPayload(MeasurementCycle &mc);
 
   /**
    * Set to true if want to debug every update value