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JsonVariant automatically promotes to JsonObject or JsonArray on write

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Benoit Blanchon
2019-01-29 14:09:09 +01:00
parent 5aea1363cc
commit 6f55d1e58f
53 changed files with 1197 additions and 541 deletions
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31
examples/JsonServer/JsonServer.ino
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@ -2,15 +2,15 @@
// Copyright Benoit Blanchon 2014-2018
// MIT License
//
// This example shows how to implement an HTTP server that sends JSON document
// in the responses.
// This example shows how to implement an HTTP server that sends a JSON document
// in the response.
// It uses the Ethernet library but can be easily adapted for Wifi.
//
// It sends the value of the analog and digital pins.
// The JSON document looks like the following:
// The JSON document contains the values of the analog and digital pins.
// It looks like that:
// {
// "analog": [ 0, 1, 2, 3, 4, 5 ],
// "digital": [ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 ]
// "analog": [0, 76, 123, 158, 192, 205],
// "digital": [1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0]
// }
#include <ArduinoJson.h>
@ -51,15 +51,12 @@ void loop() {
// Read the request (we ignore the content in this example)
while (client.available()) client.read();
// Allocate the JSON document
// Use arduinojson.org/assistant to compute the capacity.
// Allocate a temporary JsonDocument
// Use arduinojson.org/v6/assistant to compute the capacity.
StaticJsonDocument<500> doc;
// Make our document represent an object
JsonObject root = doc.to<JsonObject>();
// Create the "analog" array
JsonArray analogValues = root.createNestedArray("analog");
JsonArray analogValues = doc.createNestedArray("analog");
for (int pin = 0; pin < 6; pin++) {
// Read the analog input
int value = analogRead(pin);
@ -69,7 +66,7 @@ void loop() {
}
// Create the "digital" array
JsonArray digitalValues = root.createNestedArray("digital");
JsonArray digitalValues = doc.createNestedArray("digital");
for (int pin = 0; pin < 14; pin++) {
// Read the digital input
int value = digitalRead(pin);
@ -83,9 +80,11 @@ void loop() {
Serial.println();
// Write response headers
client.println("HTTP/1.0 200 OK");
client.println("Content-Type: application/json");
client.println("Connection: close");
client.println(F("HTTP/1.0 200 OK"));
client.println(F("Content-Type: application/json"));
client.println(F("Connection: close"));
client.print(F("Content-Length: "));
client.println(measureJsonPretty(doc));
client.println();
// Write JSON document