gsm/gsm0480.c: introduce gsm0480_extract_ie_by_tag()
In some cases, there is no need to parse the whole message,
e.g. during the conversion from DTAP to GSUP/MAP. This
function can be used to extract given IE from a message.
Change-Id: I3989d061903352473305f80712f1a1560d05df3d
diff --git a/tests/ussd/ussd_test.ok b/tests/ussd/ussd_test.ok
index aff383e..8fa4348 100644
--- a/tests/ussd/ussd_test.ok
+++ b/tests/ussd/ussd_test.ok
@@ -1,3 +1,9 @@
+[i] Testing gsm0480_extract_ie_by_tag()
+[?] REGISTER message with Facility IE (len=21): a1 13 02 01 03 02 01 3b 30 0b 04 01 0f 04 06 2a d5 4c 16 1b 01
+[?] REGISTER message with SS version IE (len=1): 00
+[?] FACILITY message with Facility IE (len=18): a2 10 02 01 01 30 0b 02 01 3c 30 06 04 01 0f 04 01 32
+[?] RELEASE COMPLETE message with Facility IE (len=8): a3 06 02 01 05 02 01 24
+
Tested if it still works. Text was: **321#
interrogateSS CFU text..'' code 33
Testing parsing a USSD request and truncated versions