Is there a ready to use way for onboard full data logging like MP does?
I was thinking to make one, but don’t really have the time now. 
Thx,
Gábor
MP does not do “full data logging”! It merely records the MAVLink protocol stream into the .tlog file.
APM:Plane already has a configurable onboard logging function and the APM2.5/2.6 has a flash chip for logging on board.
This information is easily found in the documentation which you should have read before posting a question.
Hi Stefan and Gabor,
I actually would like to add tlog logging to the SD card on PX4, to complement the dataflash logging. The reason I think it would be useful is there are a lot of tools for processing tlogs in interesting ways so having a high rate (maybe 20Hz?) tlog on the SD card would be very useful.
We’d still have the dataflash logging as well.
I’ve been meaning to add this for a while, just haven’t done it yet, sorry!
Cheers, Tridge
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Now i started to use a Android phone to do this for me.
This was the easy way.
It also gives me a unlimited telemetry range.
So it does bough. Keeps the tlogs on the phone, and also able to send it down realtime.
This i will have to try. 
(Works on the table.)
Thx,
Gábor