After some use with my PropBoard (which I’m loving so far) I have a couple hardware suggestions that would make troubleshooting and ease of use a lot easier. First would be an onboard smd LED for the rx/tx pins, one to indicate power, and/or a configurable LED. These should be able to be toggled on or off to reduce power consumption. I would also find an smd momentary tactile push button very useful to reset the board (like on ordinary Arduinos) so I don’t need to disconnect and reconnect to restart my program. Feel free to include your own suggestions or feedback!