Iuh_Emulation: Avoid sending events to HNBAP if socket is not connected

This should hopefully fix HNB_Tests errors showing up in jenkins after
the test finishes:
Iuh_Emulation.ttcn:203 Dynamic test case error: Port HNBAP has neither connections nor mappings. Message cannot be sent on it.

Change-Id: Ide201425e81dcfe2fd395d820bdcbd74f5415ef5
diff --git a/library/Iuh_Emulation.ttcn b/library/Iuh_Emulation.ttcn
index 75a95ba..bc8e7c3 100644
--- a/library/Iuh_Emulation.ttcn
+++ b/library/Iuh_Emulation.ttcn
@@ -128,6 +128,12 @@
 	return conn_id;
 }
 
+private function f_send_IUHEM_Event(template (value) IUHEM_Event evt) runs on Iuh_Emulation_CT {
+	if (HNBAP.checkstate("Connected")) {
+		HNBAP.send(evt);
+	}
+}
+
 function main(Iuh_conn_parameters p, charstring id) runs on Iuh_Emulation_CT {
 	var Result res;
 	g_pars := p;
@@ -147,7 +153,7 @@
 
 	/* notify user about SCTP establishment */
 	if (p.remote_sctp_port != -1) {
-		HNBAP.send(IUHEM_Event:{up_down:=IUHEM_EVENT_UP});
+		f_send_IUHEM_Event(IUHEM_Event:{up_down:=IUHEM_EVENT_UP});
 	}
 
 	while (true) {
@@ -194,13 +200,13 @@
 			g_last_conn_id := asp_evt.connOpened.connId;
 			log("Established a new Iuh connection (conn_id=", g_last_conn_id, ")");
 
-			HNBAP.send(IUHEM_Event:{up_down:=IUHEM_EVENT_UP}); /* TODO: send g_last_conn_id */
+			f_send_IUHEM_Event(IUHEM_Event:{up_down:=IUHEM_EVENT_UP}); /* TODO: send g_last_conn_id */
 		}
 
 		[] Iuh.receive(ASP_Event:{connClosed:=?}) -> value asp_evt {
 			log("Iuh: Closed");
 			g_self_conn_id := -1;
-			HNBAP.send(IUHEM_Event:{up_down:=IUHEM_EVENT_DOWN});  /* TODO: send asp_evt.connClosed.connId */
+			f_send_IUHEM_Event(IUHEM_Event:{up_down:=IUHEM_EVENT_DOWN});  /* TODO: send asp_evt.connClosed.connId */
 			if (not emu_is_server()) {
 				self.stop;
 			}