Check BIN log messages are multi instance.

[billbonney]

@billbonney can you check that mavlink and bin log message instances work? We use that a lot now, and will be using it more and more over time
for example, BATTERY_STATUS is multi-instance in MAVLink2, IMU is multi-instance in bin logs

Originally posted by @tridge in ArduPilot/ardupilot_wiki#6957 (comment)