I have a copter that has a PixRacer running 3.6.8 and has been running great for some time. I originally had a FrSky X4SB RX and was using the FrSky port on the pixracer to pass telemetry to the RX and everything worked great. I decided to upgrade to the new R9M and the R9Slim+ and thought originally it would be a direct drop replacement. After installing and finding out that the Telemetry was not passing I started to search the internet for help. Others claim to have great success with other FC other claim they did have a problem until the firmware on in BetaFlight or others have been fixed. What I am finding is that when the R9Slim is powered up with the PixRacer the telemtry com fails to pass anything. But if I boot the PixRacer first and the wait for it to completely load then power the RX telemtry starts to flow. I reached out to frsky and they claim it is the FC that has the problem not the RX because others are working. Is there a chance to add a delay to eliminate a timeout that must be happening when the S-Port on the R9 RX is used to pass telemetry?
Edit - Just one more thing I did purchase a " FrSky Yaapu Telemetry Converter" to see if it was just a problem with the FrSky Serial4 on the PixRacer. Using the converter I plugged it into Telem2 and set the protocol to 10 and also found the same issue. A race to recognize the S-Port happening. While on Telem2 again if I boot the PixRacer completely first then power the RX telemtry starts to flow on Serial2.
Thanks again for all you awesome work…