I spent so much time trying to figure out how to wirelessly reset the Arduino, which is a requirement for uploading code to the processor.

I came up with a new solution for the wireless reset: On the programmer side, I have a powerful electromagnet connected through a power transistor to a RTS pin on a FTDI adapter. On B10N1C PCB I have a Hall effect sensor connected to a reset pin. HM 10/11 stays in design.

The electromagnet must be located close to the skin in order to accomplish the uploading code.

I have already a prototype for testing.