Channel group to physical CAN device mapping

[paweller]

Hello,

I have got a setup where five pysical CAN devices get recorded. When looking at the corresponding .mf4 file utilizing asammdf.MDF(fp).channels_db channel group indices well and beyond zero to five are displayed. Neither the master_db nor the bus_logging_map attribute seem to give me the channel group to physical CAN device mapping.

Did I just miss something or how to I get this mapping?
Any hint is much appreciated.

Cheers!

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Edit: I found a solution via the detour of utilizing the CAN devices' names as stated during the recording.

grp_ch_mapping = [
    mdf.groups[grp[0]]['channels'][grp[1]]['source']['path']
    for hits in [mdf.whereis(sig) for sig in sig_names] for grp in hits
]

However, this only works if the CAN devices' names that got used during recording are known. How can this mapping be done without knowing the names?