@andyp1per I was not clear in my introduction that this system kind of works but it is slow and inreliable.
Trying to get up to speed on Yaapu Frsky passthrough
Frsy bidirectional thread
Yaapu Ardupilot dev conference 2020
Which seems dependent on FrSky but you say that TBS are working on it. Many things I don’t understand yet.
I may be able to work around the mavlink parameters by buffering them in mavproxy. Need to look into that.
In armed operation the largest waste of bandwidth is having to repeat the gps location messages in crsf with the location messages in mavlink. The transmitter only needs altitude and airspeed at high frequency. Ideally there would be some kind of crsf-mavlink message bridge in the Tracer Tx.
Looks like I am gradually talking my way out of this being an Ardupilot problem.
My airframe is very compact. I don’t see any viable options for the Rx other than TBS Tracer Nano.