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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
-----
#42<code><cs>
Checksum:
---------
XOR over Signs intrepreted as 4-bit numbers (see translation table below)
DTMF-Sign | Number
------------+----------
D | 0
1 | 1
2 | 2
3 | 3
4 | 4
5 | 5
6 | 6
7 | 7
8 | 8
9 | 9
0 | 10
* | 11
# | 12
A | 13
B | 14
C | 15
Codes:
------
0 .. shut up (rfkill)
1 .. unshut up (no rfkill)
8 .. activate payload receiver
9 .. reset settings
C .. cancel all commands
# .. reset (hardware reboot only)
* .. safe mode (stop all activties and harvest energy)
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