Hi! Thanks for the in-depth post and pictures - that really helps!
I think you might be hitting: http://www.espruino.com/Troubleshooting#espruino-works-when-connected-to-a-computer-but-stops-when-powered-from-something-else
You'll need USB.setConsole(1) in onInit on the WiFi, and Bluetooth.setConsole(1) on the MDBT42
The other one (as far as I can see) is grounding. While there are 2 wires for RX/TX on serial communications the voltages on the serial lines are relative to GND, so you actually need to connect the two GND pins on MDBT42 and Espruino Wifi together as well in order for it to function properly/reliably.
Otherwise after that I reckon you'd be sorted!
As soon as I have a moment, I try it and I tell you ...
Thank you so much!
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