Could Not Able to Connect to ThingsBoard Using MQTT.

Dear Community,

I am trying to Access the Data That I have Populated on ThingsBoard IoT Server Using MQTT Protocol with the help of ESP8266 D1 Mini. I am Trying to Take that Data Using MATLAM Industrail Communication ToolBox for Which I Have Written the Following Code.

% Replace these values with your ThingsBoard MQTT broker details

brokerAddress = "ssl://demo.thingsboard.io"; % Adjust the broker address

port = 1883; % Use the appropriate port for secure MQTT

% Replace these values with your ThingsBoard device details

clientID = "";

userName = "";

password = ""; % Leave empty if not required

% Replace this with the path to the root certificate you downloaded

rootCert = "";

% Create an MQTT client

mqClient = mqttclient(brokerAddress, 'Port', port, 'ClientID', clientID, ...

'Username', userName, 'Password', password, 'CARootCertificate', rootCert);

% Check if the connection is established

mqClient.Connected

% Expected output: ans = int32(1)

% Subscribe to the telemetry topic

topicToSub = "v1/devices/me/telemetry";

subscribe(mqClient, topicToSub);

% Wait for a while to receive messages (adjust the time as needed)

pause(60);

% Peek at the MQTT client to view received messages

peek(mqClient);

% Close the MQTT client

clear mqClient;

%%%%%%_______________________RESULT____________________________%%%%%%

>> MQTT_Receive

Warning: Using a port that allows unencrypted communication. For confidential matters, considering using an encryption

enforcing port, such as 8883.

Error using MQTT_Receive

Failed to establish a connection with broker "ssl://demo.thingsboard.io".

Desperately Looking Forward for Your Assistance............

Regards

Answer 1

[Divyanshu]

Hi Hafiz,

I understand that you are facing issues while connecting to ThingsBoard using MQTT. This is a bug which is already reported and the team is working on it.

Meanwhile, you can try using MQTT Explorer app (separate software) to establish the connection successfully.

[Hafiz Hamza]

I am very grateful to hear from you.

Please confrim one thing do I have to code all again to switch to MQTT explorer? As I already have esblished a connection to ThingsBoard using ESP8266 and transferring the data to the server. The difficulty arices when I am trying to access the data using MATLAB.

[Divyanshu]

Yes I think, you have to re-establish the connection using MQTT explorer app and then proceed.

Also, you can try updating to the latest version of MATLAB and retry doing it from MATLAB itself.

Hope it helps!

[Hafiz Hamza]

Thank you very much. Could you please refer me to a specific documnt that will help me to start from the bigining. I mean to establish a connection of MQTT explorer to both ESP8266 and MATLAB.

Regards

[Divyanshu]

Hi, I would recommend trying again with MATLAB by updating it to latest version, before moving to MQTT explorer app.