Pr/spektrum accept 0x01or0x02 #42
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…'no first frame' error message to print in fewer than 80 characters
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Solved Problem
Some combinations of Spectrum RC Transmitters bound to the satellite receiver on the VOXL2 Sentinel drone result in DSM packets with protocol byte 0x01. The current spektrum_rc driver will only accept packets with 0x02 protocol byte. The current system will reject DSM packets in this case and not print the protocol version as the string is too long for the character terminal.
Addresses VOXL2 forum issue: https://forum.modalai.com/topic/2703/voxl2-spektrum-receiver-error/
Solution
Changelog Entry
For release notes: Change spectrum_rc to accept protocol bytes 0x01 or 0x02 and shorten 'no first frame' error message to print in fewer than 80 characters
Alternatives
This avoids having to try alternative transmitter hardware
Test coverage
Ground test with DX7 transmitter shows expected behavior passing valid rc_input to the system. Input pauses and resumes as expected cycling power on the transmitter and VOXL2.