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PFCP_Emulation: respond to incoming Heartbeat Req

This is a mandatory procedure that every 3GPP TS 29.244 compliant
peer shall support.

Change-Id: I93990feb1864701e2903af85480093ef751bafe5
Related: SYS#6772
---
M library/PFCP_CodecPort.ttcn
M library/PFCP_Emulation.ttcn
2 files changed, 16 insertions(+), 1 deletion(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/53/37953/1

diff --git a/library/PFCP_CodecPort.ttcn b/library/PFCP_CodecPort.ttcn
index 8d4078d..783ffb0 100644
--- a/library/PFCP_CodecPort.ttcn
+++ b/library/PFCP_CodecPort.ttcn
@@ -26,6 +26,12 @@
 	PDU_PFCP pdu
 }
 
+template (present) PFCP_Unitdata
+tr_PFCP_UD(template (present) PDU_PFCP pdu := ?) := {
+	peer := ?,
+	pdu := pdu
+}
+
 /* Translation port on top of IPL4asp; ASP_Event passed through transparently */
 type port PFCP_PT message {
 	out PFCP_Unitdata;
diff --git a/library/PFCP_Emulation.ttcn b/library/PFCP_Emulation.ttcn
index d872367..2fb3a8a 100644
--- a/library/PFCP_Emulation.ttcn
+++ b/library/PFCP_Emulation.ttcn
@@ -15,6 +15,7 @@
 import from General_Types all;
 import from Osmocom_Types all;
 import from PFCP_Types all;
+import from PFCP_Templates all;
 import from PFCP_CodecPort all;
 import from PFCP_CodecPort_CtrlFunct all;
 
@@ -123,7 +124,15 @@
 
 	while (true) {
 		alt {
-		[] PFCP.receive(PFCP_Unitdata:?) -> value ud {
+		[] PFCP.receive(tr_PFCP_UD(tr_PFCP_Heartbeat_Req)) -> value ud {
+				log("Rx Heartbeat Req: ", ud.pdu);
+				pdu := valueof(ts_PFCP_Heartbeat_Resp(g_recovery_timestamp));
+				pdu.sequence_number := ud.pdu.sequence_number;
+				ud.pdu := pdu;
+				PFCP.send(ud);
+			}
+
+		[] PFCP.receive(tr_PFCP_UD(?)) -> value ud {
 				log("PFCP_Emulation main() PFCP.receive: ", ud);
 				vc_conn := null;
 				if (ud.pdu.s_flag == '1'B) {

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