I don't know the H520E but I think (or better I hope) it is very similar to H520.
For H520 and H Plus (both PX4) I know two different types of log:
- TLOG files recorded at the ST16. That are basically the MAV-link messages sent to the ST16
- ULOG files recorded at the memory card of the drone.
Ulog files have a lot of data in. More information here:
Log Analysis using Flight Review · PX4 v1.9.0 User Guide
I use Flight review to read those logs:
Flight Review
To read TLOG files I use Q500log2kml. It is not perfect and read only some of the MAVlink messages, not all; hopefully the most interesting.
Q500log2kml was made for legacy Yuneec flight logs and the PX4 related came on top. Unfortunately no good/intuitive user interface for PX4 stuff but better than nothing.
Windows64bit:
http://h-elsner.mooo.com/downloads/q500log2kml_en.zip
LINUX 64bit:
http://h-elsner.mooo.com/downloads/q500log2kml_en.tar.gz
User manual:
http://h-elsner.mooo.com/pdf/Q500log2kml_en.pdf
br HE