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Can not connect to ThingSpeak MQTT broker using MQTT X Client

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Hello,
I have a problem with the connection to thingspeak MQTT broker using MQTT x client. After pressing the "Connect" button after a few seconds connection is not set.
I have followed the instructions described in: https://de.mathworks.com/help/thingspeak/use-desktop-mqtt-client-to-publish-to-a-channel.html.
Below you can see the settings in the MQTT X client. ClientID, Username and Password I took from the credentials file which was created when I add a new MQTT device in thingspeak.
I have already checked the discussion with a similar problem, but I can not figure out what could be the source of the problem.
I would like to ask your help with this problem.
Thank you,
Levani Meskhiya

Accepted Answer

Vinod
Vinod on 4 Apr 2022
If you're connecting over Secure MQTT, you need to use port 8883, not port 1883 as your screenshot shows.
  9 Comments
Vinod
Vinod on 4 Apr 2022
Edited: Vinod on 4 Apr 2022
If websocket works, I would reccomend secure websocket (wss://) on port 443 with SSL/TLS enabled and CA signed server.
You'd have to check with your IT administrator about outgoing connection and which network ports are allowed, and specifically if outgoing connections on port 8883 are blocked by your firewall.

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More Answers (1)

Hoa Vinh
Hoa Vinh on 15 Feb 2024
I have problem cannot connect MQTTX to Thingspeak mqtt server.
host: mqtt:// mqtt3.thingspeak.com & port 1883 -> cannot
host: mqtts:// mqtt3.thingspeak.com & port 8883 -> cannot
What is the issue ?
  1 Comment
Milan Tomin
Milan Tomin on 2 Mar 2024
Edited: Milan Tomin on 2 Mar 2024
Having the same problem, have you found any solution?
Although im using sp-react-native-mqtt in react native to connect to thingspeak.
I keep getting unknown host exception error, so it seems that the mqtt3.thingspeak.com part is somehow problematic?

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