How to use multiple types for mavlogdump.py

[anshulsood-02]

I am trying to use this command:
mavlogdump.py --types=BAT,BARO --format=csv L1.BIN > L1.csv

But it only generates a csv of the first type mentioned.
The code mentions: types of messages (comma separated with wildcard)
but I am not sure if it works or if I am typing it wrong.

[peterbarker]

@anshulsood-02 you cn only dump from one message type when generating a CSV.

We could probably come up with a rule on when to emit a CSV line, but we don't have one ATM. You don't want to emit for every (e.g.) BAT and BARO line, for example. Most sensible would probably emit any time you've seen all message types and get an instance of the first message, or something along those lines.

[shancock884]

In the current implementation of mavlogdump.py, you get a clear message if you try to specify multiple types when dumping to CSV:

$ mavlogdump.py --format=csv --types=UNIT,MULT ArduPlane-Soaring-00000045.BIN 
Need exactly one type when dumping CSV from bin file

I don't know if this would count as a 'fix' for this issue? - at least the restriction is made clear to the user in a nice way.

(See also: #905 (comment))