Variability in the response style from certain modems causes the parsing
of the +CGMR response to fail. For example, the Telit HE910 inserts an
empty string ("") in the second field of the response, causing the
sscanf implementation to fail.
This patch converts the parsing of the CGMR response to a regex that
allows for more flexibility and robustness, and adds unit tests around
the parsing call.
Signed-off-by: Nick Stevens <Nick.Stevens@digi.com>
Previously the enable unsolicited messages command (+CNMI) was only
being sent on the primary. This patch adds support for sending the
enable on the secondary as well. If the secondary doesn't exist, or if
setting the enable causes an error, a warning is logged but no error is
propagated up.
This change is needed for proper SMS operation on the Telit HE910, which
requires that +CNMI be sent to both primary and secondary. Since a
failure to send the +CNMI command on the secondary is a non-fatal error,
it is unlikely that this will cause issues with other modems.
Signed-off-by: Nick Stevens <Nick.Stevens@digi.com>
Nick Stevens