It seams that some manufacturers are sending the NMEA checksum using lower case characters for a...f.
So It would be good of the library would also accept them in the checksum.
This has been fixed already on last summer, but for some reason I had not pushed it to github. Now it is there wit some other updates I had on my own code.
It seams that some manufacturers are sending the NMEA checksum using lower case characters for a...f. So It would be good of the library would also accept them in the checksum.