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osmo-msc/openbsc/tests/sndcp_xid
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Philipp Maier db142dc59d sndcp: Allow empty SNDCP-XID indications 
In some rare cases the modem might send a xid indication that does
not contain anything except the version number field. The sgsn
ignors such SNDCP-XID indications by stripping the entire field
from the response. We found a modem in the wild that started to
act problematic when the empty SNDCP-XID was missing in the
response. This patch changes the XID negotiation behaviour in
a way that if a modem should send empty SNDCP-XID indications,
the reply will also contain an empty SNDCP-XID indication. Apart
from that the SNDCP-XID version number is now parsed and echoed
in the response. This ensures that we always reply with the version
number that the modem expects. (The version was 0 in all cases we
observed so far)

Change-Id: I097a770cb4907418f53e620a051ebb8cd110c5f2
Related: OS#1794
 		2016-12-23 11:19:15 +01:00
..
Makefile.am SNDCP: add SNDCP-XID encoder/decoder and unit test 2016-09-24 03:17:58 +00:00
sndcp_xid_test.c sndcp: Allow empty SNDCP-XID indications 2016-12-23 11:19:15 +01:00
sndcp_xid_test.ok SNDCP: add SNDCP-XID encoder/decoder and unit test 2016-09-24 03:17:58 +00:00