I’ve tried connecting the N2+ to the Yamaha AVR without the TV. CEC works there – I’m able to run scan in cec-client and get back devices, and I can see CEC packets from the N2+ with the logic analyser.
Doing the same with the TV plugged in, the N2+ sends the start bit, and then the first bit, then messes up the timing of the second bit, and then tries sending another start bit and gives up:
TRAFFIC: [ 277096] >> 01
TRAFFIC: [ 278760] >> 01:83
TRAFFIC: [ 278760] << 1f:84:41:00:01
WARNING: [ 278774] Write: write failed
TRAFFIC: [ 278774] << 1f:84:41:00:01
WARNING: [ 278790] Write: write failed
I’m out of ideas 🤷