Pretty json print, added parsing functionality

examples/AntaresMQTTSubscribe/AntaresMQTTSubscribe.ino

@@ -1,3 +1,20 @@
+/*
+    This is an example sketch to subscribe to MQTT data on ESP8266
+    via the Antares IoT Platform.
+
+    MQTT server & port:
+    platform.antares.id, port 1338
+
+    MQTT topic:
+    /oneM2M/req/your-access-key/antares-cse/json
+
+    The main function in this sketch is the callback function,
+    which will be fired every time a new message is published
+    to the topic.
+
+    For more information, please visit https://antares.id/id/docs.html
+*/
+
 #include <AntaresESP8266MQTT.h>
 
 #define ACCESSKEY "your-access-key"
@@ -10,12 +27,23 @@
 AntaresESP8266MQTT antares(ACCESSKEY);
 
 void callback(char topic[], byte payload[], unsigned int length) {
-  String topicString = String(topic);
-  String payloadString = antares.byteToString(payload, length);
+  /*
+    Get the whole received data, including the topic,
+    and parse the data according to the Antares data format.
+  */
+  antares.get(topic, payload, length);
 
-  Serial.println("[ANTARES] New Mesage: ");
-  Serial.println(topicString);
-  Serial.println(payloadString);
+  Serial.println("New Message!");
+  // Print topic and payload
+  Serial.println("Topic: " + antares.getTopic());
+  Serial.println("Payload: " + antares.getPayload());
+  // Print individual data
+  Serial.println("Temperature: " + String(antares.getInt("temperature")));
+  Serial.println("Humidity: " + String(antares.getInt("humidity")));
+  Serial.println("Wind speed: " + String(antares.getFloat("wind_speed")));
+  Serial.println("Rain level: " + String(antares.getFloat("rain_level")));
+  Serial.println("Latitude: " + antares.getString("latitude"));
+  Serial.println("Longitude: " + antares.getString("longitude"));
 }
 
 void setup() {
@@ -26,5 +54,9 @@ void setup() {
   antares.setCallback(callback);
 }
 void loop() {
+  /*
+    Check if we're still connected to the MQTT broker/server.
+    If disconnected, the device will try to reconnect.
+  */
   antares.checkMqttConnection();
 }