I have been using the ESP8266 to transfer data to the Ubidots platform over the MQTT connection for the last year. When I tried it again today, it did not work. The code has not changed. As an alternative I used the “base code” for the MQTT connection again and tried to transfer just a simple Variable, where I also get the same error message:
“Attempting MQTT connection…failed, rc=-4 try again in 3 seconds”
I am sure that my TOKEN is correct, so I can rule that out as the cause.
Can you help me?
Thank you very much in advance!
Code:
#include "UbidotsESPMQTT.h"
#define TOKEN "" // Your Ubidots TOKEN
#define WIFINAME "" //Your SSID
#define WIFIPASS "" // Your Wifi Pass
Ubidots client(TOKEN);
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i=0;i<length;i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}
void setup() {
// put your setup code here, to run once:
//client.ubidotsSetBroker("business.api.ubidots.com"); // Sets the broker properly for the business account
client.setDebug(true); // Pass a true or false bool value to activate debug messages
Serial.begin(115200);
client.wifiConnection(WIFINAME, WIFIPASS);
client.begin(callback);
}
void loop() {
// put your main code here, to run repeatedly:
if(!client.connected()){
client.reconnect();
}
float value1 = 5.3;
client.add("temperature", value1);
client.ubidotsPublish("my-new-device");
client.loop();
}
Greetings, a return code equals to -4 means a connection timeout issue, it is generally related with the access point or network connection, can you try in another site or network?
Hello,
thank you for your anaswer! Yes, i tried 2 different networks and the internet connection seems to work.
This is what i get in the Serial Monitor:
1384, room 16
12:51:23.225 -> tail 8
12:51:23.225 -> chksum …WiFi connected
12:52:08.296 -> IP address:
12:52:08.296 -> 172.20.10.6
12:52:08.296 -> entra
12:52:08.296 -> Attempting MQTT connection…failed, rc=-4 try again in 3 seconds
12:52:26.537 -> Attempting MQTT connection…
I have just uploaded the firmware below to an ESP8266 and it works properly, please give it a try:
/****************************************
* Include Libraries
****************************************/
#include "UbidotsESPMQTT.h"
/****************************************
* Define Constants
****************************************/
#define TOKEN "..." // Your Ubidots TOKEN
#define WIFINAME "..." //Your SSID
#define WIFIPASS "...." // Your Wifi Pass
Ubidots client(TOKEN);
/****************************************
* Auxiliar Functions
****************************************/
void callback(char* topic, byte* payload, unsigned int length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i=0; i < length; i++) {
Serial.print((char) payload[i]);
}
Serial.println();
}
/****************************************
* Main Functions
****************************************/
void setup() {
// put your setup code here, to run once:
client.ubidotsSetBroker("industrial.api.ubidots.com"); // Sets the broker properly for the business account
client.setDebug(true); // Pass a true or false bool value to activate debug messages
Serial.begin(115200);
client.wifiConnection(WIFINAME, WIFIPASS);
client.begin(callback);
}
void loop() {
// put your main code here, to run repeatedly:
if(!client.connected()){
client.reconnect();
}
// Publish values to 2 different data sources
client.add("stuff", 10.2); //Insert your variable Labels and the value to be sent
client.ubidotsPublish("source1");
client.add("stuff", 10.2);
client.add("more-stuff", 120.2);
client.ubidotsPublish("source2");
client.loop();
delay(10000);
}
