Hi,

uint8_t bits[15]; /* 114 bits + 2 steal bits. Filled MSB first */

if i do 8 * 15 = 120

that would make 6 bits extra... not 2 bits

And how exactly would you pack 116 bits in an integer number of bytes ...

should i discard the last 6 bits of the last byte?

The very comment you quoted above says there are 114+2 bits of payload ... 120 - (114+2) = 4 padding bits, not 6 ...

Or maybe you're under the misguided impression that "steal bits" are "padding bits" in which case it just shows you need to reread the GSM 05.xx series of specifications.

Cheers,

Sylvain