vty_test_runner: update ipa sending code

Factor out 2, add 3 functions. Those functions are simple wrappers
around hex strings specific to IPA protocol. Not all of them are
utilized at the moment but they were checked with wireshark while
working on the tests. It might come in handy if we'd like to further
expand related test harness in future. The same goes for optional
verbosity argument which is not used right now but will be handy for
future debugging.

openbsc/tests/vty_test_runner.py

@@ -736,13 +736,13 @@ class TestVTYNAT(TestVTYGenericBSC):
         self.assertEqual(data, "\x00\x01\xfe\x04")
 
         print "Going to send ID_RESP response"
-        res = ussdSocket.send("\x00\x07\xfe\x05\x00\x04\x01\x6b\x65\x79")
+        res = ipa_send_resp(ussdSocket, "\x6b\x65\x79")
         self.assertEqual(res, 10)
 
         # initiating PING/PONG cycle to know, that the ID_RESP message has been processed
 
         print "Going to send PING request"
-        res = ussdSocket.send("\x00\x01\xfe\x00")
+        res = ipa_send_ping(ussdSocket)
         self.assertEqual(res, 4)
 
         print "Expecting PONG response"
@@ -1007,6 +1007,31 @@ def add_nat_test(suite, workdir):
     test = unittest.TestLoader().loadTestsFromTestCase(TestVTYNAT)
     suite.addTest(test)
 
+def ipa_send_pong(x, verbose = False):
+    if (verbose):
+        print "\tBSC -> NAT: PONG!"
+    return x.send("\x00\x01\xfe\x01")
+
+def ipa_send_ping(x, verbose = False):
+    if (verbose):
+        print "\tBSC -> NAT: PING?"
+    return x.send("\x00\x01\xfe\x00")
+
+def ipa_send_ack(x, verbose = False):
+    if (verbose):
+            print "\tBSC -> NAT: IPA ID ACK"
+    return x.send("\x00\x01\xfe\x06")
+
+def ipa_send_reset(x, verbose = False):
+    if (verbose):
+        print "\tBSC -> NAT: RESET"
+    return x.send("\x00\x12\xfd\x09\x00\x03\x05\x07\x02\x42\xfe\x02\x42\xfe\x06\x00\x04\x30\x04\x01\x20")
+
+def ipa_send_resp(x, tk, verbose = False):
+    if (verbose):
+        print "\tBSC -> NAT: IPA ID RESP"
+    return x.send("\x00\x07\xfe\x05\x00\x04\x01" + tk)
+
 def add_bsc_test(suite, workdir):
     if not os.path.isfile(os.path.join(workdir, "src/osmo-bsc/osmo-bsc")):
         print("Skipping the BSC test")