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Protocol Definition between Ground Stations and Command RX
==========================================================
Introduction
------------
- using DTMF on FM
- receiver should be activated for min. 200ms every 5s to listen for new commands
- signs get scrambled using a secret Code Table
- every command must be aknowledged by a beacon with the unscrambled code
Frame
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#42<code><cs>
Checksum:
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XOR over Signs intrepreted as HEX (0-9A-D#*) -> (0-9A-F)
Codes:
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0 .. shut up (rfkill)
1 .. unshut up (no rfkill)
8 .. activate payload receiver
C .. cancel all commands
# .. reset
* .. safe mode (stop all activties and harvest energy)
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