I had an issue with getting the DataLogger IoT connected with ThingSpeak. I keep getting the error: [W] ThingSpeak MQTT disconnected - reconnecting.......[E] ThingSpeak MQTT: Connection Error [-2] 36.710,23.561,99605.406,33429.094,176 [W] ThingSpeak MQTT disconnected - reconnecting.......[E] ThingS…

Ok I’ve figured it out :slight_smile: I have built a Python script to test sending data to ThingSpeak, which gave me a more detailed feedback to debug the issue. The problem was indeed the certificate. I’ve proceeded according to the instructions on Mathworks (linked in original post) - but due to …

You can try most of the suggestions here ThingSpeak MQTT: Connection Error [-2] - Google Search ; I’d start with regenerating credentials and maybe trying the alternate port number (1883), set your router/firewall, ensure you aren’t already using the username or cert on another client, etc

Also see this: [image] Unknown Error (-2) When Using MQTT Secure Client on SparkFun 9Dof DataLogger Wifi Just in case someone else hits a wall on this issue, make sure you save the cert in .pem format, not .der. If you saved in the wrong format, you can convert with this …

DataLogger IoT & ThingSpeak Connection Issue

Sensors

dcarter May 10, 2025, 10:30pm 4

Also see this:

Topic		Replies	Views
Creating and Connecting to ThingSpeak using the Datalogger IOT 9Dof IMU & Motion	1	1230	July 6, 2023
Unknown Error (-2) When Using MQTT Secure Client on SparkFun 9Dof DataLogger Wifi	4	426	May 10, 2025
Uploading Certs onto the SparkFun DataLogger Wifi	1	274	May 16, 2024
SparkFun DataLogger IoT uploading data format Wifi	2	878	January 4, 2024
SparkFun DataLogger IoT 9-DoF Wifi	4	1695	August 24, 2023

DataLogger IoT & ThingSpeak Connection Issue

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