neels uploaded patch set #3 to this change.

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support "empty" SCCP N-Connect from MSC

Teach osmo-bsc to handle empty N-Connect. So far we were always
expecting user data in an SCCP N-Connect from an MSC. However, it is
perfectly valid for an initial BSSMAP request to follow later.

This is relevant for:
- Handover Request (incoming inter-BSC handover)
- Perform Location Request (query physical location of the MS)

Add state WAIT_INITIAL_USER_DATA with new timeout net X25. Always enter
this state so that we don't have two separate code paths for handling
initial user data.

Related: SYS#5864
Change-Id: I535c791fa01e99a2226392eb05f676ba6c3cc16e
---
M include/osmocom/bsc/bsc_subscr_conn_fsm.h
M src/osmo-bsc/bsc_subscr_conn_fsm.c
M src/osmo-bsc/net_init.c
M src/osmo-bsc/osmo_bsc_bssap.c
M tests/timer.vty
5 files changed, 135 insertions(+), 37 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/73/27373/3

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