Hi there!
I came across the weird behavior of mqqt node. I made new espboard that publishes to mqtt and made new flow with mqqt-in node. This node in debug node shows "undefined". I tried various scenarios and got the same result.
However if I change topic in already existing mqqt node from other previously created flows it shows correct output.
So if I copy this mqqt node with correct output then this newly created node again gives "undefined". If I grab new mqqt node from left panel - again gives "undefined".
Tried to restart server, reloaded browser - no luck so far.
Any ideas?
- How do you have the debug node setup?
- Is the debug node connected directly to the MQTT node?
- Show us a screenshot of the flow and debug output
Your debug is set to watch msg.solar. MQTT node ONLY delivers values in msg.payload
Yes, You are right! I changed msg.solar to msg.payload and now everything runs. Thanks a lot! 
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