CODEWITHSUNDEEP
iotthingsboardarduino-esp32
Sushmitha TS
Sushmitha TS

Reputation: 1

Failed to connect to Thingsboard Server

I am trying to monitor the temperature with dht22 and esp32 and send the data to the thingsboard. The Arduino sketch is as below:

\

#include "DHT.h"
#include <WiFi.h>
#include <ThingsBoard.h>

#define WIFI_SSID "*****"
#define WIFI_PASSWORD "******"

#define TOKEN "DHT22_TEMP"

// DHT
#define DHTPIN 2
#define DHTTYPE DHT22

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

WiFiClient wifiClient;

// Initialize DHT sensor.
DHT dht(DHTPIN, DHTTYPE);

ThingsBoard tb(wifiClient);

int status = WL_IDLE_STATUS;
unsigned long lastSend;

void setup()
{
  Serial.begin(115200);
  dht.begin();
  delay(10);
  InitWiFi();
  lastSend = 0;
}

void loop()
{
  if ( !tb.connected() ) {
    reconnect();
  }

  if ( millis() - lastSend > 1000 ) { // Update and send only after 1 seconds
    getAndSendTemperatureAndHumidityData();
    lastSend = millis();
  }

  tb.loop();
}

void getAndSendTemperatureAndHumidityData()
{
  Serial.println("Collecting temperature data.");

  // Reading temperature or humidity takes about 250 milliseconds!
  float humidity = dht.readHumidity();
  // Read temperature as Celsius (the default)
  float temperature = dht.readTemperature();

  // Check if any reads failed and exit early (to try again).
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.println("Sending data to ThingsBoard:");
  Serial.print("Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.println(" *C ");

  tb.sendTelemetryFloat("temperature", temperature);
  tb.sendTelemetryFloat("humidity", humidity);
}

void InitWiFi()
{
  Serial.println("Connecting to AP ...");
  // attempt to connect to WiFi network

  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to AP");
}


void reconnect() {
  // Loop until we're reconnected
  while (!tb.connected()) {
    status = WiFi.status();
    if ( status != WL_CONNECTED) {
      WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
      while (WiFi.status() != WL_CONNECTED) {
        delay(500);
        Serial.print(".");
      }
      Serial.println("Connected to AP");
    }
    Serial.print("Connecting to ThingsBoard node ...");
    if ( tb.connect(thingsboardServer, TOKEN) ) {
      Serial.println( "[DONE]" );
    } else {
      Serial.print( "[FAILED]" );
      Serial.println( " : retrying in 5 seconds]" );
      // Wait 5 seconds before retrying
      delay( 5000 );
    }
  }
}

When this code is uploaded, it says:

"Connecting to ThingsBoard Server... [TB] Connection to server failed [Failed] Retrying in 5 seconds"

I expect it to connect to thingsboard and send the data to it, Thingsboard is installed on-premise.

Upvotes: 0

Views: 880

Answers (1)

AgusK
AgusK

Reputation: 23

i never use thingsboar demo, i was using thingsboard cloud, to set up connection the server i use it like a define

#define TOKEN               "YOUR_ACCESS_TOKEN"
#define THINGSBOARD_SERVER  "demo.thingsboard.io"

all the rest must work, i will see again the example code from thingsboard example

Upvotes: 0

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