"I captured the data on the Rx line of the OSD, and I have found the RC_CHANNELS messages sent by the Ardupilot (system 01, component 01) regularly:
Radio turned off:FS LN SQ SS SC MI TS32LH RCLH1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 CC RS…"
"Ok, to simplify things, I connected the OSD Tx line to my FTDI's Rx line and dumped the raw serial communication data with my Linux. (Do yourself a favor if you try this: issue an "stty -F /dev/ttyUSB0 57600 raw" command to capture…"
"I made some measurements today with my logical analyzer and yep, the OSD definitely requests a huge amount data from the autopilot through mavlink.Right after the first heartbeat arrives on the OSD's Rx line (D1) from the autopilot, the OSD…"