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Add LAPDm Bter frames to LAPDm_Types.ttcn and BTS_Tests.ttcn

The new type LapdmFrameBter and its send and receive template is used to
send and receive Bter frames, which has a short L2 header and uses all
23 octets for payload.

Bter frames are DCCH UI frames with SAPI 0 and 23 octets sent on
downlink only.

Change-Id: I07a4fd9879dfd9de441c0348a84b7dd5c9864eb4
---
M bts/BTS_Tests.ttcn
M library/LAPDm_Types.ttcn
2 files changed, 40 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/14/33814/1

diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn
index 2a56a25..37d15b8 100644
--- a/bts/BTS_Tests.ttcn
+++ b/bts/BTS_Tests.ttcn
@@ -7325,6 +7325,8 @@
 			lapdm.b4 := dec_LapdmFrameB4(l2);
 		} else if (ischosen(exp.bbis)) {
 			lapdm.bbis := dec_LapdmFrameBbis(l2);
+		} else if (ischosen(exp.bter)) {
+			lapdm.bter := dec_LapdmFrameBter(l2);
 		}
 		log("Rx LAPDm ", lapdm);
 		if (match(lapdm, exp)) {
diff --git a/library/LAPDm_Types.ttcn b/library/LAPDm_Types.ttcn
index baa2b7e..4d02863 100644
--- a/library/LAPDm_Types.ttcn
+++ b/library/LAPDm_Types.ttcn
@@ -211,10 +211,20 @@
 	external function dec_LapdmFrameBbis(in octetstring stream) return LapdmFrameBbis
 		with { extension "prototype(convert) decode(RAW)" };
 
+	type record LapdmFrameBter {
+		octetstring		payload
+	} with { variant "" };
+
+	external function enc_LapdmFrameBter(in LapdmFrameBter si) return octetstring
+		with { extension "prototype(convert) encode(RAW)" };
+	external function dec_LapdmFrameBter(in octetstring stream) return LapdmFrameBter
+		with { extension "prototype(convert) decode(RAW)" };
+
 	type union LapdmFrame {
 		LapdmFrameAB	ab,
 		LapdmFrameBbis	bbis,
-		LapdmFrameB4	b4
+		LapdmFrameB4	b4,
+		LapdmFrameBter	bter
 	} with { variant "" };
 
 	external function enc_LapdmFrame(in LapdmFrame si) return octetstring
@@ -361,6 +371,17 @@
 		}
 	}
 
+	template LapdmFrame ts_LAPDm_Bter_UI(octetstring l3) := {
+		bter := {
+			payload := l3
+		}
+	}
+	template LapdmFrame tr_LAPDm_Bter_UI(template octetstring l3) := {
+		bter := {
+			payload := l3
+		}
+	}
+
 	template LapdmFrame tr_LAPDm_I(template LapdmSapi sapi, template boolean c_r,
 					template boolean p, template uint3_t nr,
 					template uint3_t ns, template octetstring l3,

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