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Change-Id: I7928d78e2ce3e6eca545455d08bc89ca67e01f9f
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Change-Id: I67659275beda1b6a89bdf11eb0231438b0c8b912
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Reshuffle the decision not to activate PDCH when GPRS is off:
Even though all current callers should avoid passing a PDCH activation in case
GPRS is off, it's a better idea to not assert on it and crash osmo-bsc.
Move the decision to omit PDCH activation and logging about it into the actual
functions that do PDCH activation. If PDCH activation is skipped, the lchan
then just stays as it was, and that's what it should anyway be doing.
Change-Id: Ib26642f08044d71a2469e6dbabf1e6fbcb02044d
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In rsl_chan_activate_lchan(), remove a condition to also allow switching pchan
modes when not in PDCH mode, which is actually not needed and would hinder
switching from pchan=NONE or between TCH/F <-> TCH/H.
Refactor the part where lchan_alloc() decides to switch a pchan mode into a
separate function, ts_usable_as_pchan(), which transparently checks both dyn TS
kinds for:
- Already in switchover? (missing check for ip.access style dyn TS)
- Is the lchan->state in error? (missing check for ip.access style dyn TS)
- Switch from pchan=NONE? (missing feature for Osmocom style dyn TS, for proper
handling with gprs mode none)
- Switch between TCH/F <-> TCH/H when all subslots are unused?
(missing feature for Osmocom style dyn TS, also useful for gprs mode none)
Always pass the desired pchan in the dyn_as_pchan argument to the _lc_find_*
functions to make switchover decisions transparent. Use the _lc_dyn_find_bts()
function for ip.access style dyn TS for the same reason.
Related: OS#3244
Change-Id: I72d5d833b186b1e1925d513885b405d8c19aa496
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Recent Icf6e25ff068e8a2600562d52726ead65e864ec02 changed the dyn_ts_init() hook
from bootstrap_rsl() to the Channel OPSTART ACK, but this is not sufficient.
Now RBS2k never calls dyn_ts_init(), and we may need to wait for RSL:
Dyn TS should actually be initialized only when *both* OML opstart and RSL link
are established. To that end, introduce a generalized API to query OML and RSL
status and to trigger a timeslot init at the appropriate time.
Add gsm_ts_check_init() to be called both when RSL and OML opstart are
established: trigger gsm_ts_init() only when both are given.
Add gsm_bts_trx_ts->initialized flag to mark whether initialization has already
taken place. Add gsm_bts_mark_all_ts_uninitialized() to conveniently clear this
flag for all TS in a BTS.
Add gsm_bts_model.oml_is_ts_ready() callback so that each BTS implementation
can return the OML status of a timeslot in its own OML implementation.
Actually, currently all BTS models that need this init mechanism store the TS'
OML status in ts->mo.nm_state. While we would in practice correctly init dyn TS
by just looking at ts->mo.nm_state, semantically, the decision whether the TS
is ready is up to the BTS models' specific OML implementations.
From bootstrap_rsl(), call gsm_ts_check_init(), in case the TS OML Opstart has
happened before RSL is established -- applies to all BTS models.
For all BTS models:
- call gsm_{bts,trx}_mark_all_ts_uninitialized() when OM is torn down, to make
sure the TS init mechanism will work a second time.
For all BTS models supporting dyn TS, i.e. osmo-bts, nanobts and RBS2k:
- implement oml_is_ts_ready().
- call gsm_ts_check_init() when a Channel OM is taken into operation.
Any BTS models that don't set oml_is_ts_ready() will see a ts init as soon as
RSL is bootstrapped (incidentally, the old dyn TS behavior before recent
Icf6e25ff068e8a2600562d52726ead65e864ec02).
This firstly fixes dyn TS for RBS2k by re-adding the initial switch to PDCH,
and furthermore does so only after both OML TS opstart and RSL are through.
This fixes the ttcn3-bsc-tests around dyn TS, since for the osmo-bts-virtual,
the RSL is established only after OML opstart on the TS, which was broken by
Icf6e25ff068e8a2600562d52726ead65e864ec02.
Nokia Site and Siemens BS11 practically do not require this init mechanism,
since all that happens there so far is dyn TS init, and these BTS models do not
support dyn TS of any kind. A future patch may add oml_is_ts_ready().
Related: OS#3205
Change-Id: I99f29d2ba079f6f4b77f0af12d9784588d2f56b3
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Set lchan->state to LCHAN_S_ACT_REQ in rsl_chan_activate_lchan(), not in
handle_new_assignment().
This is the first part of a fix for dynamic timeslots handling in the gscon.
Rationale:
In rsl_chan_activate_lchan(), we may choose to set the lchan state to
LCHAN_S_REL_REQ and wait for dyn TS switchover from PDCH.
So the caller from bsc_api.c handle_new_assignment() must not bluntly set the
state to LCHAN_S_ACT_REQ, which is not accurate in the case of dyn TS
switchover.
In case of dyn TS switchover, a later release ack received from the BTS will
cause rsl_chan_activate_lchan() to be called again, at which point we may
accurately set state LCHAN_S_ACT_REQ, and continue the Assignment.
Related: OS#3211
Change-Id: Iedb4fb63bf1959d5f1d2c6edb6a7f5097ff16bd7
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Move to its own function, store pointer to proper header format and use
the already defined IE define from libosmocore instead of using
hardcoded values.
Depends on: Change-Id I7cb65f3ff1cfdbe4eee97b7545bcd13a38c72e25
Change-Id: I845fd3f0c6ff31f268f68a31e1d55981f7ec6129
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messages received
Change-Id: I2e2e40bcb9365420f7e79d8d954505b0d2376bed
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In the current implementation of osmo-bsc, the subscriber connection is
not handled (very) statefully. However, there is some state keeping in the
code that handles the mgcp connection, but there are still to much loose ends
which allow odd situations to happen, which then lead severe error situations
(see also closes tags at the end) This commit adds a number of improvements
to fix those problems.
- Use an osmo-fsm to control the gsm_subscriber_connection state and
make sure that certain operations can only take place at certain states
(e.g let connection oriented SCCP traffic only pass when an SCCP connection
actually exists.
Remove the old osmo_bsc_mgcp.c code. Use the recently developed MGCP client
FSM to handle the MGCP connections.
Also make sure that stuff that already works does not break. This in
particular refers to the internal handover capability and the respective
unit-tests.
See also OS#2823, OS#2768 and OS#2898
- Fix logic to permit assignment to a signalling channel. (OS#2762)
- Introduce T993210 to release lchan + subscr_conn if MSC fails to respond
The GSM specs don't have an explicit timer for this, so let's introdcue
a custom timer (hence starting with 99).
This timeout catches the following situation:
* we send a SCCP CR with COMPL_L3_INFO from the MS to the MSC,
* the MSC doesn't respond (e.g. SCCP routing failure, program down, ...)
The MS is supposed to timeout with T3210, 3220 or 3230. But the BSC
shouldn't trust the MS but have some timer on its own.
SCCP would have a timer T(conn est), but that one is specified to be
1-2min and hence rather long.
See also: OS#2775
- Terminate bsc_subscr_conn_fsm on SCCP N-DISC.ind from MSC
If the MSC is disconnecting the SCCP channel, we must terminate the FSM
which in turn will release all lchan's and other state.
This makes TC_chan_rel_hard_rlsd pass, see also OS#2731
As a side-effect, this fixes TC_chan_act_ack_est_ind_refused(),
where the MSC is answering with CREF to our CR/COMPL_L3.
- Release subscriber connection on RLL RELEASE IND of SAPI0 on main DCCH
The subscriber connection isn't really useful for anything after the
SAPI0 main signalling link has been released. We could try to
re-establish, but our best option is probably simply releasing the
subscriber_conn and anything related to it.
This will make TC_chan_rel_rll_rel_ind pass, see also OS#2730
This commit has been tested using the BSC_Tests TTCN3 testsuit and the
following tests were passed:
TC_chan_act_noreply
TC_chan_act_ack_noest
TC_chan_act_ack_est_ind_noreply
TC_chan_act_ack_est_ind_refused
TC_chan_act_nack
TC_chan_exhaustion
TC_ctrl
TC_chan_rel_conn_fail
TC_chan_rel_hard_clear
TC_chan_rel_hard_rlsd
TC_chan_rel_a_reset
TC_rll_est_ind_inact_lchan
TC_rll_est_ind_inval_sapi1
TC_rll_est_ind_inval_sapi3
TC_rll_est_ind_inval_sacch
TC_assignment_cic_only
TC_assignment_csd
TC_assignment_ctm
TC_assignment_fr_a5_0
TC_assignment_fr_a5_1_codec_missing
TC_assignment_fr_a5_1
TC_assignment_fr_a5_3
TC_assignment_fr_a5_4
TC_paging_imsi_nochan
TC_paging_tmsi_nochan
TC_paging_tmsi_any
TC_paging_tmsi_sdcch
TC_paging_tmsi_tch_f
TC_paging_tmsi_tch_hf
TC_paging_imsi_nochan_cgi
TC_paging_imsi_nochan_lac_ci
TC_paging_imsi_nochan_ci
TC_paging_imsi_nochan_lai
TC_paging_imsi_nochan_lac
TC_paging_imsi_nochan_all
TC_paging_imsi_nochan_plmn_lac_rnc
TC_paging_imsi_nochan_rnc
TC_paging_imsi_nochan_lac_rnc
TC_paging_imsi_nochan_lacs
TC_paging_imsi_nochan_lacs_empty
TC_paging_imsi_a_reset
TC_paging_counter
TC_rsl_drop_counter
TC_classmark
TC_unsol_ass_fail
TC_unsol_ass_compl
TC_unsol_ho_fail
TC_err_82_short_msg
TC_ho_int
Authors:
Harald Welte <laforge@gnumonks.org>
Philipp Maier <pmaier@sysmocom.de>
Neels Hofmeyr <neels@hofmeyr.de>
Closes: OS#2730
Closes: OS#2731
Closes: OS#2762
Closes: OS#2768
Closes: OS#2775
Closes: OS#2823
Closes: OS#2898
Closes: OS#2936
Change-Id: I68286d26e2014048b054f39ef29c35fef420cc97
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Handover decision 2 will also store the last seen mr nr for neighbor cell
measurements and hence can tell whether a neighbor's measurement is outdated.
Change-Id: Ic1148364597f91b5a55666c80c758b61fa56f582
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osmo-msc does currently not check if an MS attemts to establish an
SACCH link on SAPI=0. This combination is not permitted and should
be dropped.
- Make sure that establish indication for SAPI=0 and channel-type=SACCH
is not permitted
See also TTCN3 Testcase:
BSC_Tests.TC_rll_est_ind_inval_sacch
Change-Id: I12962072c0ea689d2b9b5c2899ffb59be9310dcb
Closes: OS#2750
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When the first EstablishInd (DCCH) is made by the MS, then it must by
definition happen on SAPI=0. The MS may establish multiple connection
on other SAPIs afterwards. At the moment osmo-bsc does not check the
SAPI when an EstablishInd message is received.
- For SAPIs other than 0, check if SAPI=0 has already been
established
See also TTCN3 testcases:
BSC_Tests.TC_rll_est_ind_inval_sapi1
BSC_Tests.TC_rll_est_ind_inval_sapi3
Change-Id: Ibf4fca0bd42dfe5bc63e8b08754ebbe0a5e252c3
Closes: OS#2750
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The IMMEDIATE ASSIGN REJECT message contains a wait indicator which
tells an MS requesting a channel to wait for a specified amount of
time before trying to request a channel again, i.e. the wait indicator
controls the T3122 timeout value in the MS.
Previously, the wait indicator was fixed to 10 seconds.
This is not sufficient if there are a lot of MS requesting channels
because the MS will retry too soon. Instead of using a fixed value,
maintain a dynamic wait indicator value based on average channel load.
The load (used vs. available channels on a BTS) is sampled once per
second, and once 8 samples have been collected we update a BTS-specific
T3122 wait indicator based on the measured load.
While the wait indicator could go up to 255 seconds, this initial
implementation keeps it in the range from 10 to 128 seconds.
Further experimentation and testing will show whether higher wait
indicator values are desirable, if the sampling rate needs to change,
or if the function mapping the load measurement to a wait indicator
value should change (currently we map the load average linearly into
the range [10, 128] inclusive).
Change-Id: I57e38f6d6ba3b23cc6e1f9520b90261dbb1f1cec
Related: OS#2592
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Local variable is_lu in rsl_rx_chan_rqd() has been unused
since commit 6082a377f57901302816a2e57e75a3f262b7b7e6.
Change-Id: I67594afcfa4104e91352d50f40ae9f2bc20f4cd1
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The up-to-date rqd_ta is required for assignment command. If the phone
moves, the timing advance might change. The rqd_ta will be updated by
each measurement report.
Change-Id: If1a592e590cfed55ff3dca5be89e2946e8017a22
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get_meas_rep_avg will return -EINVAL, if the required number of
measurements are not reached. There will be no handover possible until the
given number of measurements are available.
Change-Id: Ibc4410b4e162cdb6c070128d2c63946bb79d6d65
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This is needed, so channel can be negotiated before the actual channel
type is assigned.
In case there is no SDCCH available, try to assign what ever the MS requested.
If this is not possible try to assign TCH/F. If this is still not possible,
reject channel request.
Change-Id: I10fc9f60c58c6b7ed424a86ce23bf6b9802c9eb1
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There still is a lot of dead code that we inherited from the NITB
days, let's remove more of it.
libtrau will be re-introduced as part of osmo-mgw later.
Change-Id: I8e0af56a158f25a4f1384d667c03eb20e72df5b8
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Those NACKs shouldn't happen in production, and if they do, you probably
want to have a more persistent figure than a line in the log file about
it. Having counters allows the user to monitor this efficiently.
Change-Id: Ic82c6baaf4cb88d07bc5cdc200f8279cf130f396
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Those NACKs (CRCX/MDCX/PDCH_ACT) shouldn't happen in production, and
if they do, you probably want to have a more persistent figure than
a line in the log file about it. Having counters allows the user
to monitor this efficiently.
Change-Id: I5edf979c9a2b4c9a5a60eef9f66c26da54f2bddf
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Change-Id: I268f222140fa5783e1d19f81fbd45614aaa4b8c4
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Change-Id: I471b598af194dee78ebaa3414b6290c72d9bbcff
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We used to have a lot of counters only globlly per BSC, but they're
much more useful on a per-BTS level.
Change-Id: I954b9dda72b83b91d46a934c221a8b3375743599
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Previously we've used function so debug print always pointed to the same
place which is not very useful. Wrap it with macro so proper
file:line is printed. Also, make sure that we always change state only
through this wrapper and log only when the state has changed.
Change-Id: I21789f8021290965b61a54a2b23177ccbbfe8321
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Change-Id: I39e7b882caa98334636d19ccd104fd83d07d5055
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Change-Id: I64d84c52f6e38e98144eb9be8f0ab82e0e1f6cca
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This was originally a long series of commits converging to the final result
seen in this patch. It does not make much sense to review the smaller steps'
trial and error, we need to review this entire change as a whole.
Implement AoIP in osmo-msc and osmo-bsc.
Change over to the new libosmo-sigtran API with support for proper
SCCP/M3UA/SCTP stacking, as mandated by 3GPP specifications for the IuCS and
IuPS interfaces.
From here on, a separate osmo-stp process is required for SCCP routing between
OsmoBSC / OsmoHNBGW <-> OsmoMSC / OsmoSGSN
jenkins.sh: build from libosmo-sccp and osmo-iuh master branches now for new
M3UA SIGTRAN.
Patch-by: pmaier, nhofmeyr, laforge
Change-Id: I5ae4e05ee7c57cad341ea5e86af37c1f6b0ffa77
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When converting from GSM_PCHAN_PDCH, we should generate
a RSL channel number IE with the osmocom extension
RSL_CHAN_OSMO_PDCH rather than claiming it is a regular
TCH/F channel.
This is important as this function is used by
osmo-bts, too - and it decides which channel number IE is
put in the GSMTAP header for both GSMTAP tracing as well
as the GSMTAP based osmo-bts-virtual.
In order to avoid any unintended effect on libbsc,
we make sure to modify rsl_ipacc_pdch_activate() to
always use GSM_PCHAN_TCH_F in related RSL message.
Change-Id: Ie34219e64a6d89da4a79f2db8ec73d1909fb8280
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We no longer permit timers with a 0 value, so this case can never
happen. Also, if it should happen, I'd rather have a timter expiring
immediately (and breaking something) than not being started in the
first place.
Change-Id: Ibfcdd3ddc0155caee89c501498329bde247621a0
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If we want to instruct the BTS to stop sending a given SI, we must be
able to send the respective BCCH INFO / SACCH FILLING with a header but
without any L3 data IE. This patch enables the related functions to do
this whenever their data argument points to NULL.
Change-Id: I88b85614951a108574f05db3b706884afe7e87a9
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Disable large parts of the code that depend on BSC presence. The code sections
disabled by #if BEFORE_MSCSPLIT shall be modified or dropped in the course of
adding the A-interface.
Don't set msg->lchan nor msg->dst.
Don't use lchan in libmsc.
Decouple lac from bts.
Prepare entry/exit point for MSC -> BSC and MSC -> RNC communication:
Add msc_ifaces.[hc], a_iface.c, with a general msc_tx_dtap() to redirect to
different interfaces depending on the actual subscriber connection.
While iu_tx() is going to be functional fairly soon, the a_tx() is going to be
just a dummy for some time (see comment).
Add Iu specific fields in gsm_subscriber_connection: the UE connection pointer
and an indicator for the Integrity Protection status on Iu (to be fully
implemented in later commits).
Add lac member to gsm_subscriber_connection, to allow decoupling from
bts->location_area_code. The conn->lac will actually be set in iu.c in an
upcoming commit ("add iucs.[hc]").
move to libcommon-cs: gsm48_extract_mi(), gsm48_paging_extract_mi().
libmsc: duplicate gsm0808 / gsm48 functions (towards BSC).
In osmo-nitb, libmsc would directly call the functions on the BSC level, not
always via the bsc_api. When separating libmsc from libbsc, some functions are
missing from the linkage.
Hence duplicate these functions to libmsc, add an msc_ prefix for clarity, also
add a _tx to gsm0808_cipher_mode():
* add msc_gsm0808_tx_cipher_mode() (dummy/stub)
* add msc_gsm48_tx_mm_serv_ack()
* add msc_gsm48_tx_mm_serv_rej()
Call these from libmsc instead of
* gsm0808_cipher_mode()
* gsm48_tx_mm_serv_ack()
* gsm48_tx_mm_serv_rej()
Also add a comment related to msc_gsm0808_tx_cipher_mode() in two places.
Remove internal RTP streaming code; OsmoNITB supported that, but for OsmoMSC,
this will be done with an external MGCP gateway.
Remove LCHAN_MODIFY from internal MNCC state machine.
Temporarily disable all paging to be able to link libmsc without libbsc.
Skip the paging part of channel_test because the paging is now disabled.
Employ fake paging shims in order for msc_vlr_tests to still work.
msc_compl_l3(): publish in .h, tweak return value. Use new libmsc enum values
for return val, to avoid dependency on libbsc headers. Make callable from
other scopes: publish in osmo_msc.h and remove 'static' in osmo_msc.c
add gsm_encr to subscr_conn
move subscr_request to gsm_subscriber.h
subscr_request_channel() -> subscr_request_conn()
move to libmsc: osmo_stats_vty_add_cmds()
gsm_04_08: remove apply_codec_restrictions()
gsm0408_test: use NULL for root ctx
move to libbsc: gsm_bts_neighbor()
move to libbsc: lchan_next_meas_rep()
move vty config for t3212 to network level (periodic lu)
remove unneccessary linking from some tests
remove handle_abisip_signal()
abis_rsl.c: don't use libvlr from libbsc
gsm_subscriber_connection: put the LAC here, so that it is available without
accessing conn->bts. In bsc_api.c, place this lac in conn for the sake of
transition: Iu and A will use this new field to pass the LAC around, but in a
completely separate OsmoBSC this is not actually needed. It can be removed
again from osmo-bsc.git when the time has come.
Siemens MRPCI: completely drop sending the MRPCI messages for now, they shall
be added in osmo-bsc once the A-Interface code has settled. See OS#2389.
Related: OS#1845 OS#2257 OS#2389
Change-Id: Id3705236350d5f69e447046b0a764bbabc3d493c
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Original libvlr code is by Harald Welte <laforge@gnumonks.org>,
polished and tweaked by Neels Hofmeyr <nhofmeyr@sysmocom.de>.
This is a long series of trial-and-error development collapsed in one patch.
This may be split in smaller commits if reviewers prefer that. If we can keep
it as one, we have saved ourselves the additional separation work.
SMS:
The SQL based lookup of SMS for attached subscribers no longer works since the
SQL database no longer has the subscriber data. Replace with a round-robin on
the SMS recipient MSISDNs paired with a VLR subscriber RAM lookup whether the
subscriber is currently attached.
If there are many SMS for not-attached subscribers in the SMS database, this
will become inefficient: a DB hit returns a pending SMS, the RAM lookup will
reveal that the subscriber is not attached, after which the DB is hit for the
next SMS. It would become more efficient e.g. by having an MSISDN based hash
list for the VLR subscribers and by marking non-attached SMS recipients in the
SMS database so that they can be excluded with the SQL query already.
There is a sanity limit to do at most 100 db hits per attempt to find a pending
SMS. So if there are more than 100 stored SMS waiting for their recipients to
actually attach to the MSC, it may take more than one SMS queue trigger to
deliver SMS for subscribers that are actually attached.
This is not very beautiful, but is merely intended to carry us over to a time
when we have a proper separate SMSC entity.
Introduce gsm_subscriber_connection ref-counting in libmsc.
Remove/Disable VTY and CTRL commands to create subscribers, which is now a task
of the OsmoHLR. Adjust the python tests accordingly.
Remove VTY cmd subscriber-keep-in-ram.
Use OSMO_GSUP_PORT = 4222 instead of 2222. See
I4222e21686c823985be8ff1f16b1182be8ad6175.
So far use the LAC from conn->bts, will be replaced by conn->lac in
Id3705236350d5f69e447046b0a764bbabc3d493c.
Related: OS#1592 OS#1974
Change-Id: I639544a6cdda77a3aafc4e3446a55393f60e4050
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This is the first step in creating this repository from the legacy openbsc.git.
Like all other Osmocom repositories, keep the autoconf and automake files in
the repository root. openbsc.git has been the sole exception, which ends now.
Change-Id: I9c6f2a448d9cb1cc088cf1cf6918b69d7e69b4e7
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