proof of concept: RaspberryPi2 <-> RaspberryPi2 (mule_pi) <-> RaspberryPi2

I decided 1st to realize this configuration as some sort of  "proof of concept":

RaspberryPi2 (rural kiosk pi) <->  RaspberryPi2 (mule_pi) <->  RaspberryPi2  (server_connect_pi)

Then next steps will follow - User backend is developped in parallel.

All necessary elements are available.
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2nd will be server-backend

3rd will be ANDORID transporting APP.