ubxtool - last_statement_identifier functionality

[Martin Laabs]

Hi,

I currently separate the gps_io class out of the ubxtool to re-utilize it 
in my program without the opts global variable.

I think there was a plan to filter received messages with the 
last_statement_identifier member in the ubx class. However, it seems to be 
not implemented in the ubx class. The ubxtool neither use that functionality.

I certainly need this filtering later to ensure e.g. a VALSET was 
successful carried out. Since this is only relevant for the msg_decoder 
method I would like to remove the class member 'last_statement_identifier' 
and handle the filtering outside the class by e.g. returning the 
statement_identifier from the decode_msg as well. Does someone expect some 
adverse side-effects from that?

Best regards,
 Martin

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