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Difficoltà di connessione con il client MQTT al server di thingspeak

Matteo on 7 Dec 2023
Latest activity Reply by Christopher Stapels on 7 Dec 2023

Buongiorno, non mi è possibile connetermi al canale di thingspeak che ho creato, per passare i dati tramite MQTT. Il codice segue la libreria PubSubClient su arduino ide, l'errore restituito dal serial monitor dell'ide é: -4 : MQTT_CONNECTION_TIMEOUT - the server didn't respond within the keepalive time.
Allego il codice per eventuali verifiche:
Grazie per a disponibilità
#include "PubSubClient.h"
#include <ESP8266WiFi.h>
#include "secrets.h"
bool DEBUG = false; // true=serial message of debug enabled
char* server = "mqtt.thingspeak.com";
WiFiClient wifiClient;
PubSubClient client(server, 1883, wifiClient);
String payload;
// BME280 Setting
#include <Wire.h>
#include <Adafruit_BME280.h>
//#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BME280 bme; // I2C
bool BMEStatus;
ADC_MODE(ADC_VCC); // Set ADC for read Vcc
// Update time in seconds. Min with Thingspeak is ~20 seconds
const int UPDATE_INTERVAL_SECONDS = 3600; //il clock interno ha un errore del 5% questo valore va tarato sperimentalmente
//const int UPDATE_INTERVAL_SECONDS = 60; // caricamento ogni minuto solo per test
void setup()
{
// Connect BME280 GND TO pin14 OR board's GND
pinMode(14, OUTPUT);
digitalWrite(14, LOW);
Serial.begin(115200);
delay(10);
// BME280 Initialise I2C communication as MASTER
Wire.begin(13, 12); //Wire.begin([SDA], [SCL])
BMEStatus = bme.begin();
if (!BMEStatus)
{
if (DEBUG) { Serial.println("Could not find BME280!"); }
//while (1);
}
// Weather monitoring See chapter 3.5 Recommended modes of operation
bme.setSampling(Adafruit_BME280::MODE_FORCED,
Adafruit_BME280::SAMPLING_X1, // temperature
Adafruit_BME280::SAMPLING_X1, // pressure
Adafruit_BME280::SAMPLING_X1, // humidity
Adafruit_BME280::FILTER_OFF );
// read values from the sensor
float temperature, humidity, pressure;
if (BMEStatus)
{
temperature = bme.readTemperature();
humidity = bme.readHumidity();
pressure = bme.readPressure() / 100.0F;
}
else
{
if (DEBUG) Serial.println("Could not find BME280!");
temperature=0;
humidity=0;
pressure=0;
}
float voltage = ESP.getVcc();
voltage = voltage/1024.0; //volt
if (DEBUG)
{
Serial.println("T= " + String(temperature) + "°C H= " + String(humidity) + "% P=" + String(pressure) + "hPa V=" + voltage + "V");
}
// Construct MQTT payload
payload="field1=";
payload+=temperature;
payload+="&field2=";
payload+=humidity;
payload+="&field3=";
payload+=pressure;
payload+="&field4=";
payload+=voltage;
payload+="&status=MQTTPUBLISH";
//Connect to Wifi
if (DEBUG)
{
Serial.println();
Serial.print("\nConnecting to WiFi SSID ");
Serial.print(SECRET_SSID);
}
WiFi.begin(SECRET_SSID, SECRET_PASS);
int timeOut=10; // Time out to connect is 10 seconds
while ((WiFi.status() != WL_CONNECTED) && timeOut>0)
{
delay(1000);
if (DEBUG) { Serial.print("."); }
timeOut--;
}
if (timeOut==0) //No WiFi!
{
if (DEBUG) Serial.println("\nTimeOut Connection, go to sleep!\n\n");
ESP.deepSleep(1E6 * UPDATE_INTERVAL_SECONDS);
}
if (DEBUG) // Yes WiFi
{
Serial.print("\nWiFi connected with IP address: ");
Serial.println(WiFi.localIP());
}
// Reconnect if MQTT client is not connected.
if (!client.connected())
{
reconnect();
}
mqttpublish();
delay(200); // Waiting for transmission to complete!!! (ci vuole)
WiFi.disconnect( true );
delay( 1 );
if (DEBUG) { Serial.println("Go to sleep!\n\n"); }
// Sleep ESP and disable wifi at wakeup
ESP.deepSleep( 1E6 * UPDATE_INTERVAL_SECONDS, WAKE_RF_DISABLED );
}
void loop()
{
//there's nothing to do
}
void mqttpublish()
{
// read values from the sensor
float temperature, humidity, pressure;
if (DEBUG)
{
Serial.print("Sending payload: ");
Serial.println(payload);
}
// Create a topic string and publish data to ThingSpeak channel feed.
String topicString ="channels/" + String( channelID ) + "/publish/"+String(writeAPIKey);
unsigned int length=topicString.length();
char topicBuffer[length];
topicString.toCharArray(topicBuffer,length+1);
if (client.publish(topicBuffer, (char*) payload.c_str()))
{
if (DEBUG) Serial.println("Publish ok");
}
else
{
if (DEBUG) Serial.println("Publish failed");
}
}
void reconnect()
{
String clientName="MY-ESP";
// Loop until we're reconnected
while (!client.connected())
{
if (DEBUG) Serial.println("Attempting MQTT connection...");
// Try to connect to the MQTT broker
if (client.connect((char*) clientName.c_str()))
{
if (DEBUG) Serial.println("Connected");
}
else
{
if (DEBUG)
{
Serial.print("failed, try again");
// Print to know why the connection failed.
// See http://pubsubclient.knolleary.net/api.html#state for the failure code explanation.
Serial.print(client.state());
Serial.println(" try again in 2 seconds");
}
delay(2000);
}
}
}

1 Comment

Christopher Stapels
Christopher Stapels on 7 Dec 2023
Your code is using the deprecated MQTT format. Have a look at the MQTT doc for the new format, and see the examples for some code.
You will have to make an MQTT devicein ThingSepak and add the channel that you want to be able to interact with to th device for publish and subscribe.

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