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MQTT.FX to ThingSpeak MQTT Broker
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March 6, 2018
11:02 pm
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rstacey
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Hi:

I've tried running your MQTT.FX to ThingSpeak tutorial and I'm not receiving data on my channel.  The MQTT.FX log shows I'm successfully Publishing data, however, on the ThingSpeak side my channel shows 0 entries.  I could use some help on the ThingSpeak side debugging this.

Thanks,

Ralph.

March 7, 2018
9:10 am
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JasonW

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The log in MQTT.fx only records that a publish message was sent successfully.  It won't tell you anything about what happens on service side.  For example, if the API key or channel number is wrong, an error won't show up in the MQTT.fx log.

Here is a handy list of things to check if MQTT publish isn't working for you:
https://www.mathworks.com/help/thingspeak/troubleshoot-MQTT-publish.html  

March 9, 2018
6:44 pm
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rstacey
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Found the problem.  I was using the MQTT API key in the Publish link in MQTT.FX.  I replaced it with the Write API key and all's well.  Thanks.

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