Please connect a debug node(set to display the complete msg object) to the output of an mqtt-in node and show us what it looks like. (copy and paste it to a reply)
In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)
``` 
   code goes here 
```
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 icon.
See this post for more details - How to share code or flow json
- Why not use auto-detect (parsed JSON object, string or buffer)?
- what version of NR and node.js are you running? (see NR startup log) \