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

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Anam Amjad
Anam Amjad 2022-7-5
评论： Vinod 2024-8-1
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.
  2 个评论
Geoff Hayes
Geoff Hayes 2022-7-6
@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
Hafiz Hamza 2023-12-5
@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.

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Vinod
Vinod 2022-7-6
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.
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Mohamed
Mohamed 2024-7-31
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
Vinod 2024-8-1
For MATLAB R2019a/R019b, you need to install this toolbox and follow the examples in there.

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