So, after realizing, that this PCBA is not suitable for my mWessenger project, I decided to reconfigure it just by replacing some resistors/capacitors/jumpers and use it for other purposes.

At the moment I'll post schematics in "as-it-is" stage, however, I plan to make it work with tiny solar panel and Li-Po battery. - Then I'll post all other files. Probably, I'll even design some enclosure for 3D-printing.

If you are interested in helping / joining this project - just let me know, I'll share design files already now with you ;)