Sending data to ThingsBoard from NodeMCU

ThingsBoard is an open source IoT platform to which data can be transmitted by device like NodeMCU using the MQTT protocol. Below is the video which explains the NodeMCU code.

Below is the code for the same:

#include <ESP8266WiFi.h>

#include <PubSubClient.h>

const char* ssid = "your wifi username";

const char* password = "your wifi password";

#define TOKEN "HuIeGJ8HJjy9GNafQs2J" //Access token of device Temperature-Sensor

char ThingsboardHost[] = "demo.thingsboard.io";

WiFiClient wifiClient;

PubSubClient client(wifiClient);

int status = WL_IDLE_STATUS;

void setup()

{

  Serial.begin(115200);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {

    delay(200);

    Serial.print(".");

  }

  Serial.println("");

  Serial.print("connected to");

  Serial.println(ssid);

  client.setServer( ThingsboardHost, 1883 );

}

void loop()

{

if ( !client.connected() )

{

    reconnect();

}

getAndSendTemperatureAndHumidityData();

  delay(5000);

}

void getAndSendTemperatureAndHumidityData()

{

 

 

  // Prepare a JSON payload string

  String payload = "{";

 payload += "\"Humidity\":";payload += 75; payload += ",";

 payload += "\"Temperature\":";payload += 45;

  payload += "}";

  char attributes[1000];

  payload.toCharArray( attributes, 1000 );

  client.publish( "v1/devices/me/telemetry",attributes);

  Serial.println( attributes );

   

}

void reconnect() {

  // Loop until we're reconnected

  while (!client.connected()) {

    status = WiFi.status();

    if ( status != WL_CONNECTED) {

      WiFi.begin(ssid, password);

      while (WiFi.status() != WL_CONNECTED) {

        delay(500);

        Serial.print(".");

      }

      Serial.println("Connected to AP");

    }

    Serial.print("Connecting to ThingsBoard node ...");

    // Attempt to connect (clientId, username, password)

    if ( client.connect("Esp8266", TOKEN, NULL) ) {

      Serial.println( "[DONE]" );

    } else {

      Serial.print( "[FAILED] [ rc = " );

      Serial.println( " : retrying in 5 seconds]" );

      delay( 500 );

    }

  }

}