I am unable to connect MQTT client using Thingspeak in MATLAB.

Here is my piece of code, I am following the steps of the tutorial https://www.mathworks.com/help/icomm/ug/get-started-with-mqtt.html

clientID = "client id";
userName = "user name";
password = "password";

rootCert = "Path";

brokerAddress = "ssl://mqtt3.thingspeak.com";
port = 8883;

mqClient = mqttclient(brokerAddress, Port = port, ClientID = clientID,...
    Username = userName, Password = password, CARootCertificate = rootCert);

upon reaching the mqClient, the following error occurs

ThingSpeakMQTT
Error: File: ThingSpeakMQTT.m 
Incorrect use of '=' operator. To assign a value to a variable, use '='. 
To compare values for equality, use '=='.

Please someone guide me on this.

[Geoff Hayes]

@Anam Amjad - you are using R2022a which Create MQTT client connected to broker suggests when this functionality was introduced? (I'm not entirely sure of this though...) Note that https://www.mathworks.com/matlabcentral/answers/1753160-incorrect-use-of-operator-to-assign-a-value-to-a-variable-use-to-compare-values-for-equal had a similar error but the way you have written the above code seems to be correct (and identical to that from the link you posted).

[Hafiz Hamza]

@Anam Amjad

Dera Anam,

I am facing the similar problem(Unable to connect to the ThingsBoard Server) that I think you have solved. I shall be very grateful to you if you please give a bit of your valuable time for assisting me in this matter.

Answer 1

[Vinod]

I believe you are using an older version of MATLAB. You need to use MATLAB R2022a or newer and have a license to the Industrial Communication Toolbox to use the syntax you have in the example.

[Anam Amjad]

Yes, I am using R2019a. Let me install the newer version.

Thank you.

[Hafiz Hamza]

@Anam Amjad

Dera Anam,

I am facing the similar problem(Unable to connect to the ThingsBoard Server) that I think you have solved. I shall be very grateful to you if you please give a bit of your valuable time for assisting me in this matter.

[Hafiz Hamza]

@Vinod

Dear Vinod,

I request if you please refer my query to @Anam Amjad

[Mohamed]

I am using matlab 2019 and i am unable to use MQTT library i am getting the folowing error: Undefined function or variable 'mqttclient'. Error in Untitled (line 4) mqttClient = mqttclient("tcp://"my server ip"", 'Port', 1883);

is there a solution?

[Vinod]

For MATLAB R2019a/R019b, you need to install this toolbox and follow the examples in there.