Change in osmo-ttcn3-hacks[master]: BSC_Tests: fix a race condition in TC_fh_params_handover_cmd

[fixeria]

fixeria has uploaded this change for review. ( https://gerrit.osmocom.org/c/osmo-ttcn3-hacks/+/26322 )


Change subject: BSC_Tests: fix a race condition in TC_fh_params_handover_cmd
......................................................................

BSC_Tests: fix a race condition in TC_fh_params_handover_cmd

As can be seen from ttcn3-bsc-test run #1565 on Jenkins [1], it may
happen that the VTY command requesting handover reaches the IUT earlier
than the SCCP 'SACK CC' message.  In this case, the 'SUBSCR_CONN' FSM
remains in state 'WAIT_CC', so we get an error:

  (bts=0,trx=0,ts=0,ss=0) (ARFCN 871) --> BTS 1 Manually triggering Handover from VTY
  SUBSCR_CONN(msc0-conn204)[0x5633b2877af0]{WAIT_CC}: Received Event HANDOVER_START
  SUBSCR_CONN(msc0-conn204)[0x5633b2877af0]{WAIT_CC}: Event HANDOVER_START not permitted

The easiest way to avoid this is to introduce and artificial delay
after the connection establishment and before triggering the handover.

[1] https://jenkins.osmocom.org/jenkins/view/TTCN3/job/ttcn3-bsc-test/1565/

Change-Id: I19f7ca942e22d7930a56d1a525414f137a9ef831
---
M bsc/BSC_Tests.ttcn
1 file changed, 1 insertion(+), 0 deletions(-)



  git pull ssh://gerrit.osmocom.org:29418/osmo-ttcn3-hacks refs/changes/22/26322/1

diff --git a/bsc/BSC_Tests.ttcn b/bsc/BSC_Tests.ttcn
index 4fdd059..dda1dcd 100644
--- a/bsc/BSC_Tests.ttcn
+++ b/bsc/BSC_Tests.ttcn
@@ -8888,6 +8888,7 @@
 
 	/* Establish a dedicated channel, so we can trigger handover */
 	dt := f_est_dchan(f_rnd_ra_cs(), 23, f_rnd_octstring(16));
+	f_sleep(0.5);
 
 	/* Trigger handover from BTS0 to BTS1 */
 	f_bts_0_cfg(BSCVTY, { "neighbor bts 1" });

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Gerrit-Project: osmo-ttcn3-hacks
Gerrit-Branch: master
Gerrit-Change-Id: I19f7ca942e22d7930a56d1a525414f137a9ef831
Gerrit-Change-Number: 26322
Gerrit-PatchSet: 1
Gerrit-Owner: fixeria <vyanitskiy at sysmocom.de>
Gerrit-MessageType: newchange
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