I am unable to connect MQTT client using Thingspeak in MATLAB.
11 views (last 30 days)
Show older comments
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 Comments
Geoff Hayes
on 6 Jul 2022
@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
on 5 Dec 2023
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.
Accepted Answer
Vinod
on 6 Jul 2022
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.
5 Comments
Mohamed
on 31 Jul 2024 at 6:00
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
on 1 Aug 2024 at 3:19
More Answers (0)
Communities
More Answers in the ThingSpeak Community
See Also
Categories
Find more on Web Services in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!