OpenBikeSensorFirmware Support OBS-lite variant

See https://github.com/openbikesensor/OpenBikeSensor_PCB_Board/tree/obs-lite

[x] Detect OBS-lite variant via VoltageMeter -> GND
[x] Be relaxed is hardware is not found in OBS lite mode
[ ] Remove / hide features not supported in OBS lite
[ ] ...

Aug 21 '22 10:08 amandel

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Aug 27 '22 08:08 sonarqubecloud[bot]

@opatut - this version should be ready to run on OBS-lite. For now OBS-lite has

no / fixed config
distance offset is fixed 0
name is derived from mac address OpenBikeSensor-lite-XXXX
formal reporting is only via BLE (sorry). You can use nRF Connect or hopefully the upcoming SimRa Android version to receive the data
serial is today used for debug output only
detection of the variant is via GPIO 34 which must be pulled to GND

Aug 27 '22 09:08 amandel

Awesome, just a two days ago I received the 0.1.1 PCB and today I'm going to solder it and try it out.

We should talk about serial output some time. I would suggest trying out protobuf as a platform for generating a binary protocol that can efficiently (within the limits of a background Android app, for example) be streamed, parsed, stored and so on. It should be rather easy to use on the embedded device, as it compiles to C++. We could have a "debug" message type as well, and a tiny python script to read your serial output for debug messages and output them as text on the command line, to help with development ;)