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ESP32_JSON_TEST/ESP32_JSON_TEST.ino

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+/*
+  Rui Santos
+  Complete project details at Complete project details at https://RandomNerdTutorials.com/esp32-http-get-post-arduino/
+
+  Permission is hereby granted, free of charge, to any person obtaining a copy
+  of this software and associated documentation files.
+
+  The above copyright notice and this permission notice shall be included in all
+  copies or substantial portions of the Software.
+*/
+
+#include <WiFi.h>
+#include <HTTPClient.h>
+#include <Arduino_JSON.h>
+
+const char* ssid = "Livebox-37cc";
+const char* password = "8A6060920A8A86896F770F2C47";
+
+//Your Domain name with URL path or IP address with path
+const char* serverName = "http://192.168.1.3:81/json.htm?type=command&param=getuservariables";
+
+//const char* serverName = "http://api.openweathermap.org/data/2.5/weather?q=La%20gacilly,fr&APPID=feba3f4d926db3b358a25ec782bd1c8b&lang=FR&units=metric";
+// the following variables are unsigned longs because the time, measured in
+// milliseconds, will quickly become a bigger number than can be stored in an int.
+unsigned long lastTime = 0;
+// Timer set to 10 minutes (600000)
+//unsigned long timerDelay = 600000;
+// Set timer to 5 seconds (5000)
+unsigned long timerDelay = 5000;
+
+String sensorReadings;
+float sensorReadingsArr[3];
+
+void setup() {
+  Serial.begin(115200);
+
+  WiFi.begin(ssid, password);
+  Serial.println("Connecting");
+  while(WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    Serial.print(".");
+  }
+  Serial.println("");
+  Serial.print("Connected to WiFi network with IP Address: ");
+  Serial.println(WiFi.localIP());
+ 
+  Serial.println("Timer set to 5 seconds (timerDelay variable), it will take 5 seconds before publishing the first reading.");
+}
+
+void loop() {
+  //Send an HTTP POST request every 10 minutes
+  if ((millis() - lastTime) > timerDelay) {
+    //Check WiFi connection status
+    if(WiFi.status()== WL_CONNECTED){
+              
+      sensorReadings = httpGETRequest(serverName);
+      Serial.println(sensorReadings);
+      JSONVar myObject = JSON.parse(sensorReadings);
+  
+      // JSON.typeof(jsonVar) can be used to get the type of the var
+      if (JSON.typeof(myObject) == "undefined") {
+        Serial.println("Parsing input failed!");
+        return;
+      }
+    
+      Serial.print("JSON object = ");
+      Serial.println(myObject);
+    
+      // myObject.keys() can be used to get an array of all the keys in the object
+      JSONVar keys = myObject.keys();
+    
+      for (int i = 0; i < keys.length(); i++) {
+        JSONVar value = myObject[keys[i]];
+        
+        Serial.print(keys[i]);
+        Serial.print(" = ");
+        Serial.println(value);
+        sensorReadingsArr[i] = double(value);
+      }
+      Serial.print("1 = ");
+      Serial.println(sensorReadingsArr[0]);
+      Serial.print("2 = ");
+      Serial.println(sensorReadingsArr[1]);
+      Serial.print("3 = ");
+      Serial.println(sensorReadingsArr[2]);
+    }
+    else {
+      Serial.println("WiFi Disconnected");
+    }
+    lastTime = millis();
+  }
+}
+
+String httpGETRequest(const char* serverName) {
+  WiFiClient client;
+  HTTPClient http;
+    
+  // Your Domain name with URL path or IP address with path
+  http.begin(client, serverName);
+  
+  // If you need Node-RED/server authentication, insert user and password below
+  //http.setAuthorization("REPLACE_WITH_SERVER_USERNAME", "REPLACE_WITH_SERVER_PASSWORD");
+  
+  // Send HTTP POST request
+  int httpResponseCode = http.GET();
+  
+  String payload = "{}"; 
+  
+  if (httpResponseCode>0) {
+    Serial.print("HTTP Response code: ");
+    Serial.println(httpResponseCode);
+    payload = http.getString();
+  }
+  else {
+    Serial.print("Error code: ");
+    Serial.println(httpResponseCode);
+  }
+  // Free resources
+  http.end();
+
+  return payload;
+}