fixeria has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/27994 )

Change subject: BTS_Tests: workaround addr='0.0.0.0' in f_rtpem_activate() ......................................................................

BTS_Tests: workaround addr='0.0.0.0' in f_rtpem_activate()

If a CRXC message contains optional remote IP and port IEs, the CRCX ACK received from the BTS is expected to contain its listen address and port. In some cases osmo-bts may indicate nonsense addr='0.0.0.0', and indeed the RTP_Emulation component is not gonna like this. This makes both BTS_Tests.TC_speech_rtp_tch[fh] test cases fail whenever executed in Docker:

Connection refused (unexpected)

Let's work this around by sending the remote IP and port IEs in additional MDCX message and omitting them in CRCX. This mimics osmo-bsc's behavior and makes both test cases pass.

Change-Id: I03453e72f62819989dfe6aa12d8bd889fced1046 Related: OS#5242 --- M bts/BTS_Tests.ttcn 1 file changed, 19 insertions(+), 7 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/94/27994/1

diff --git a/bts/BTS_Tests.ttcn b/bts/BTS_Tests.ttcn index 06fe43b..c2de538 100644 --- a/bts/BTS_Tests.ttcn +++ b/bts/BTS_Tests.ttcn @@ -2532,16 +2532,28 @@ var PortNumber rtpem_bind_port := mp_rtpem_bind_port; f_rtpem_bind(RTPEM_CTRL, mp_rtpem_bind_ip, rtpem_bind_port);

- /* Step 3: send CRCX with the configured address/port to the IUT */ - var RSL_Message rsl_pdu := f_rsl_transceive_ret( - ts_RSL_IPA_CRCX(g_chan_nr, f_inet_addr(mp_rtpem_bind_ip), rtpem_bind_port), + /* Step 3a: send CRCX to create an RTP connection at the IUT */ + var RSL_Message crcx_ack := f_rsl_transceive_ret( + /* FIXME (OS#5242): do not include Remote IP/Port IEs because + * osmo-bts would respond with nonsense listen addr='0.0.0.0'. */ + ts_RSL_IPA_CRCX(g_chan_nr, omit, omit), tr_RSL_IPA_CRCX_ACK(g_chan_nr, ?, ?, ?), "IPA CRCX ACK"); + var uint16_t conn_id := crcx_ack.ies[1].body.ipa_conn_id;

- /* Step 4: connect to the IUT's address/port parsed from CRCX ACK */ - var HostName local_addr := f_inet_ntoa(rsl_pdu.ies[2].body.ipa_local_ip); - var PortNumber local_port := rsl_pdu.ies[3].body.ipa_local_port; - f_rtpem_connect(RTPEM_CTRL, local_addr, local_port); + /* Step 3b: send MDCX with the configured address/port to the IUT */ + var RSL_Message mdcx_ack := f_rsl_transceive_ret( + ts_RSL_IPA_MDCX(g_chan_nr, conn_id, + remote_ip := f_inet_addr(mp_rtpem_bind_ip), + remote_port := rtpem_bind_port, + rtp_pt2 := 0), + tr_RSL_IPA_MDCX_ACK(g_chan_nr, conn_id, ?, ?, ?), + "IPA MDCX ACK"); + + /* Step 4: connect to the IUT's address/port parsed from MDCX ACK */ + var HostName bts_bind_ip := f_inet_ntoa(mdcx_ack.ies[2].body.ipa_local_ip); + var PortNumber bts_bind_port := mdcx_ack.ies[3].body.ipa_local_port; + f_rtpem_connect(RTPEM_CTRL, bts_bind_ip, bts_bind_port);

/* Step 5: set the given RTP emulation mode */ f_rtpem_mode(RTPEM_CTRL, mode);