helpers: allow 19-digit reported ICCIDs

The mm_3gpp_parse_iccid() method does validation of the ICCID string
and was originally implemented to handle +CRSM reported values. The
implementation was looking for 20-digit strings, even for 19-digit
ICCIDs (those finished with a trailing 'F').

We now extend the logic to also validate ICCID strings reported as
19-digit values directly, and when that happens we won't allow
swapping of the digits (a +CRSM specific requirement) or trailing 'F'
characters (as that is only required when reporting 19-digit ICCIDs
with 20-digit strings).

This change allows us to e.g. use the u-blox specific AT+CCID command
and validate the returned ICCID with the same helper method, which
currently fails:

  (ttyACM2): --> 'AT+CCID<CR>'
  (ttyACM2): <-- '<CR><LF>+CCID: 8934077700015848638<CR><LF><CR><LF>OK<CR><LF>'
  couldn't load SIM identifier: 'Invalid ICCID response size (was 19, expected 20)'

0 files changed, 0 insertions, 0 deletions