sccp: Handle N-NOTICE.ind (Routing Failure of SCCP CL messages)

ITU Q.714 2.8:
"""
When an end node is informed of a routing failure, this information
is forwarded towards the SCCP user by using the N-DISCONNECT primitive
(refer to reason for release in 2.1.1.2.4/Q.711) or the N-NOTICE primitive
(refer to reason for return in 2.2.2.2.4/Q.711)
"""

We are already handling N-DISCONNECT.ind for CO messages, but
N-NOTICE.ind for CL messages was not being handled.

If CL messages are not arriving to the Lb peer, then reset the link
and mark the peer as disconnected, until a new RESET can successfully fo
through.

Related: OS#5917
Change-Id: I4bfea43a99c768162faefde06558941f697bd718

Makefile.am

@@ -19,7 +19,7 @@ SUBDIRS = \
 BUILT_SOURCES = $(top_srcdir)/.version
 EXTRA_DIST = \
 	     .version \
-	     contrib/osmo-smlc.spec.in \
+	     README.md \
 	     debian \
 	     git-version-gen \
 	     osmoappdesc.py \

README.md

@@ -60,7 +60,7 @@ Contributing
 Our coding standards are described at
 <https://osmocom.org/projects/cellular-infrastructure/wiki/Coding_standards>
 
-We us a gerrit based patch submission/review process for managing
+We use a Gerrit based patch submission/review process for managing
 contributions.  Please see
 <https://osmocom.org/projects/cellular-infrastructure/wiki/Gerrit> for
 more details

TODO-RELEASE

@@ -0,0 +1,9 @@
+# When cleaning up this file: bump API version in corresponding Makefile.am and rename corresponding debian/lib*.install
+# according to https://osmocom.org/projects/cellular-infrastructure/wiki/Make_a_new_release
+# In short: https://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html#Updating-version-info
+# LIBVERSION=c:r:a
+# If the library source code has changed at all since the last update, then increment revision: c:r + 1:a.
+# If any interfaces have been added, removed, or changed since the last update: c + 1:0:a.
+# If any interfaces have been added since the last public release: c:r:a + 1.
+# If any interfaces have been removed or changed since the last public release: c:r:0.
+#library	what			description / commit summary line

configure.ac

@@ -9,6 +9,8 @@ AC_CONFIG_AUX_DIR([.])
 AM_INIT_AUTOMAKE([dist-bzip2])
 AC_CONFIG_TESTDIR(tests)
 
+CFLAGS="$CFLAGS -std=gnu11"
+
 dnl kernel style compile messages
 m4_ifdef([AM_SILENT_RULES], [AM_SILENT_RULES([yes])])
 
@@ -34,12 +36,11 @@ if test "x$PKG_CONFIG_INSTALLED" = "xno"; then
 fi
 PKG_PROG_PKG_CONFIG([0.20])
 
-PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.7.0)
-PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 1.7.0)
-PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl >= 1.7.0)
-PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 1.7.0)
-PKG_CHECK_MODULES(LIBOSMOSIGTRAN, libosmo-sigtran >= 1.6.0)
-PKG_CHECK_MODULES(LIBOSMOSCCP, libosmo-sccp >= 1.6.0)
+PKG_CHECK_MODULES(LIBOSMOCORE, libosmocore >= 1.10.0)
+PKG_CHECK_MODULES(LIBOSMOVTY, libosmovty >= 1.10.0)
+PKG_CHECK_MODULES(LIBOSMOCTRL, libosmoctrl >= 1.10.0)
+PKG_CHECK_MODULES(LIBOSMOGSM, libosmogsm >= 1.10.0)
+PKG_CHECK_MODULES(LIBOSMOSIGTRAN, libosmo-sigtran >= 2.0.0)
 
 dnl checks for header files
 AC_HEADER_STDC
@@ -115,9 +116,9 @@ AC_ARG_ENABLE([external_tests],
 				[Include the VTY/CTRL tests in make check [default=no]]),
 		[enable_ext_tests="$enableval"],[enable_ext_tests="no"])
 if test "x$enable_ext_tests" = "xyes" ; then
-	AC_CHECK_PROG(PYTHON2_AVAIL,python2,yes)
-	 if test "x$PYTHON2_AVAIL" != "xyes" ; then
-		AC_MSG_ERROR([Please install python2 to run the VTY/CTRL tests.])
+	AC_CHECK_PROG(PYTHON3_AVAIL,python3,yes)
+	 if test "x$PYTHON3_AVAIL" != "xyes" ; then
+		AC_MSG_ERROR([Please install python3 to run the VTY/CTRL tests.])
 	fi
 	AC_CHECK_PROG(OSMOTESTEXT_CHECK,osmotestvty.py,yes)
 	 if test "x$OSMOTESTEXT_CHECK" != "xyes" ; then
@@ -206,5 +207,4 @@ AC_OUTPUT(
     doc/manuals/Makefile
     contrib/Makefile
     contrib/systemd/Makefile
-    contrib/osmo-smlc.spec
     Makefile)

contrib/jenkins.sh

@@ -31,9 +31,8 @@ export PKG_CONFIG_PATH="$inst/lib/pkgconfig:$PKG_CONFIG_PATH"
 export LD_LIBRARY_PATH="$inst/lib"
 export PATH="$inst/bin:$PATH"
 
-osmo-build-dep.sh libosmo-abis
-osmo-build-dep.sh libosmo-netif
-osmo-build-dep.sh libosmo-sccp
+osmo-build-dep.sh libosmo-netif "" --disable-doxygen
+osmo-build-dep.sh libosmo-sigtran "" --disable-doxygen
 
 # Additional configure options and depends
 CONFIG=""

contrib/osmo-smlc.spec.in

@@ -1,89 +0,0 @@
-#
-# spec file for package osmo-smlc
-#
-# Copyright (c) 2017, Martin Hauke <mardnh@gmx.de>
-#
-# All modifications and additions to the file contributed by third parties
-# remain the property of their copyright owners, unless otherwise agreed
-# upon. The license for this file, and modifications and additions to the
-# file, is the same license as for the pristine package itself (unless the
-# license for the pristine package is not an Open Source License, in which
-# case the license is the MIT License). An "Open Source License" is a
-# license that conforms to the Open Source Definition (Version 1.9)
-# published by the Open Source Initiative.
-
-## Disable LTO for now since it breaks compilation of the tests
-## https://osmocom.org/issues/4113
-%define _lto_cflags %{nil}
-
-Name:           osmo-smlc
-Version:        @VERSION@
-Release:        0
-Summary:        OsmoSMLC: Osmocom's Location Service Center
-License:        AGPL-3.0-or-later
-Group:          Hardware/Mobile
-URL:            https://osmocom.org/projects/osmo-smlc
-Source:         %{name}-%{version}.tar.xz
-BuildRequires:  autoconf
-BuildRequires:  automake >= 1.9
-BuildRequires:  libtool >= 2
-BuildRequires:  pkgconfig >= 0.20
-%if 0%{?suse_version}
-BuildRequires:  systemd-rpm-macros
-%endif
-BuildRequires:  pkgconfig(libosmo-netif) >= 1.2.0
-BuildRequires:  pkgconfig(libosmo-sccp) >= 1.6.0
-BuildRequires:  pkgconfig(libosmo-sigtran) >= 1.6.0
-BuildRequires:  pkgconfig(libosmocore) >= 1.7.0
-BuildRequires:  pkgconfig(libosmoctrl) >= 1.7.0
-BuildRequires:  pkgconfig(libosmogsm) >= 1.7.0
-BuildRequires:  pkgconfig(libosmovty) >= 1.7.0
-BuildRequires:  pkgconfig(talloc)
-%{?systemd_requires}
-
-%description
-OsmoBSC: Osmocom's Base Station Controller for 2G circuit-switched mobile networks.
-
-%prep
-%setup -q
-
-%build
-echo "%{version}" >.tarball-version
-autoreconf -fi
-%configure \
-  --docdir=%{_docdir}/%{name} \
-  --with-systemdsystemunitdir=%{_unitdir}
-make %{?_smp_mflags}
-
-%install
-%make_install
-
-%if 0%{?suse_version}
-%preun
-%service_del_preun %{name}.service
-
-%postun
-%service_del_postun %{name}.service
-
-%pre
-%service_add_pre %{name}.service
-
-%post
-%service_add_post %{name}.service
-%endif
-
-%check
-make %{?_smp_mflags} check || (find . -name testsuite.log -exec cat {} +)
-
-%files
-%license COPYING
-%doc AUTHORS README.md
-%{_bindir}/osmo-smlc
-%dir %{_docdir}/%{name}/examples
-%dir %{_docdir}/%{name}/examples/osmo-smlc
-%{_docdir}/%{name}/examples/osmo-smlc/osmo-smlc.cfg
-%dir %{_sysconfdir}/osmocom
-%config(noreplace) %{_sysconfdir}/osmocom/osmo-smlc.cfg
-%{_unitdir}/%{name}.service
-
-%changelog

contrib/systemd/osmo-smlc.service

@@ -1,11 +1,15 @@
 [Unit]
 Description=Osmocom Serving Mobile Location Center (SMLC)
+After=network-online.target
+Wants=network-online.target
 
 [Service]
 Type=simple
 Restart=always
 StateDirectory=osmocom
 WorkingDirectory=%S/osmocom
+User=osmocom
+Group=osmocom
 ExecStart=/usr/bin/osmo-smlc -c /etc/osmocom/osmo-smlc.cfg
 RestartSec=2
 

debian/changelog

@@ -1,3 +1,82 @@
+osmo-smlc (0.3.2) unstable; urgency=medium
+
+  [ Oliver Smith ]
+  * contrib/jenkins: libosmo-abis after libosmo-netif
+
+  [ Pau Espin Pedrol ]
+  * jenkins.sh: Skip building unneeded libosmo-abis
+  * jenkins.sh: No need to build libosmo-sigtran with doxygen
+  * Add missing required vty go_parent_cb for libosmo-sigtran
+
+ -- Oliver Smith <osmith@sysmocom.de>  Wed, 05 Mar 2025 11:35:11 +0100
+
+osmo-smlc (0.3.1) unstable; urgency=medium
+
+  [ Harald Welte ]
+  * remove libosmo-sccp dependency; depend on libosmo-sigtran only
+
+  [ Oliver Smith ]
+  * contrib/jenkins: libosmo-sccp -> libosmo-sigtran
+
+ -- Oliver Smith <osmith@sysmocom.de>  Mon, 16 Sep 2024 12:26:33 +0200
+
+osmo-smlc (0.3.0) unstable; urgency=medium
+
+  [ Andreas Eversberg ]
+  * Use uniform log format for default config files
+
+  [ Vadim Yanitskiy ]
+  * build: include README.md into the release tarball
+  * README.md: cosmetic: fix a typo
+
+  [ Max ]
+  * .deb/.rpm: add osmocom user during package install
+
+  [ Oliver Smith ]
+  * .deb/.rpm: various fixes related to non-root
+  * contrib: remove rpm spec file
+  * debian/postinst: add checks, be verbose
+
+ -- Oliver Smith <osmith@sysmocom.de>  Thu, 25 Jul 2024 09:49:50 +0200
+
+osmo-smlc (0.2.4) unstable; urgency=medium
+
+  [ arehbein ]
+  * Transition to use of 'telnet_init_default'
+
+  [ Vadim Yanitskiy ]
+  * configure.ac: set -std=gnu11
+  * Makefile.am: remove $(COVERAGE_LDFLAGS) from osmo_smlc_LDADD
+  * Makefile.am: remove unneeded AM_LDFLAGS with LIBS
+  * tests: $(BUILT_SOURCES) is not defined, depend on osmo-smlc
+  * tests: execute osmotest{vty,config}.py against osmo-smlc
+  * copyright: fix typo: sysmocom s/s.m.f.c./s.f.m.c./ GmbH
+  * configure.ac: migrate from python2 to python3
+
+  [ Oliver Smith ]
+  * debian: set compat level to 10
+  * systemd: depend on networking-online.target
+
+  [ Neels Janosch Hofmeyr ]
+  * ctrl-test: drop bogus 'rm -f $(CTRL_TEST_DB)'
+
+  [ Pau Espin Pedrol ]
+  * Write explicit role & sctp-role fields in ASP configurations
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Tue, 12 Sep 2023 17:14:41 +0200
+
+osmo-smlc (0.2.3) unstable; urgency=medium
+
+  [ Vadim Yanitskiy ]
+  * contrib/jenkins.sh: execute distcheck/maintainer-clean with $PARALLEL_MAKE
+
+  [ Max ]
+  * Add git-review config
+  * Set working directory in systemd service file
+  * ctrl: take both address and port from vty config
+
+ -- Pau Espin Pedrol <pespin@sysmocom.de>  Tue, 07 Feb 2023 17:42:00 +0100
+
 osmo-smlc (0.2.2) unstable; urgency=medium
 
   [ Oliver Smith ]

debian/compat

@@ -1 +1 @@
-9
+10

debian/control

@@ -2,7 +2,7 @@ Source: osmo-smlc
 Section: net
 Priority: extra
 Maintainer: Osmocom team <openbsc@lists.osmocom.org>
-Build-Depends: debhelper (>=9),
+Build-Depends: debhelper (>= 10),
                dh-autoreconf,
                autotools-dev,
                autoconf,
@@ -11,10 +11,9 @@ Build-Depends: debhelper (>=9),
                pkg-config,
                libsctp-dev,
                libtalloc-dev,
-               libosmocore-dev (>= 1.7.0),
-               libosmo-sccp-dev (>= 1.6.0),
-               libosmo-sigtran-dev (>= 1.6.0),
-               osmo-gsm-manuals-dev (>= 1.3.0)
+               libosmocore-dev (>= 1.10.0),
+               libosmo-sigtran-dev (>= 2.0.0),
+               osmo-gsm-manuals-dev (>= 1.6.0)
 Standards-Version: 3.9.8
 Vcs-Git: https://gitea.osmocom.org/cellular-infrastructure/osmo-smlc
 Vcs-Browser: https://gitea.osmocom.org/cellular-infrastructure/osmo-smlc

debian/postinst

@@ -0,0 +1,38 @@
+#!/bin/sh -e
+case "$1" in
+	configure)
+		# Create the osmocom group and user (if it doesn't exist yet)
+		if ! getent group osmocom >/dev/null; then
+			groupadd --system osmocom
+		fi
+		if ! getent passwd osmocom >/dev/null; then
+			useradd \
+				--system \
+				--gid osmocom \
+				--home-dir /var/lib/osmocom \
+				--shell /sbin/nologin \
+				--comment "Open Source Mobile Communications" \
+				osmocom
+		fi
+
+		# Fix permissions of previous (root-owned) install (OS#4107)
+		if dpkg --compare-versions "$2" le "0.3.0"; then
+			if [ -e /etc/osmocom/osmo-smlc.cfg ]; then
+				chown -v osmocom:osmocom /etc/osmocom/osmo-smlc.cfg
+				chmod -v 0660 /etc/osmocom/osmo-smlc.cfg
+			fi
+
+			if [ -d /etc/osmocom ]; then
+				chown -v root:osmocom /etc/osmocom
+				chmod -v 2775 /etc/osmocom
+			fi
+
+			mkdir -p /var/lib/osmocom
+			chown -R -v osmocom:osmocom /var/lib/osmocom
+		fi
+		;;
+esac
+
+# dh_installdeb(1) will replace this with shell code automatically
+# generated by other debhelper scripts.
+#DEBHELPER#

doc/examples/osmo-smlc/osmo-smlc.cfg

@@ -1,3 +1,11 @@
+log stderr
+ logging color 1
+ logging print category-hex 0
+ logging print category 1
+ logging timestamp 0
+ logging print file basename last
+ logging print level 1
+
 cells
  lac-ci 23 42 lat 12.34567 lon 34.56789
  cgi 262 42 17 5 lat 12.34765 lon 34.56987

doc/manuals/chapters/running.adoc

@@ -74,6 +74,7 @@ cs7 instance 0
  point-code 1.23.6
  asp asp-clnt-msc-0 2905 0 m3ua
   remote-ip 127.0.0.1
+  role asp
   sctp-role client
 ----
 

include/osmocom/smlc/cell_locations.h

@@ -23,7 +23,7 @@
 
 #include <stdint.h>
 #include <osmocom/core/linuxlist.h>
-#include <osmocom/sigtran/sccp_sap.h>
+#include <osmocom/gsm/gsm0808_utils.h>
 
 struct osmo_gad;
 

include/osmocom/smlc/lb_peer.h

@@ -1,5 +1,7 @@
 #pragma once
 
+#include <stdint.h>
+
 #include <osmocom/core/linuxlist.h>
 #include <osmocom/gsm/gsm0808.h>
 #include <osmocom/sigtran/sccp_sap.h>
@@ -49,8 +51,8 @@ enum lb_peer_event {
 	LB_PEER_EV_MSG_DOWN_CO,
 	LB_PEER_EV_RX_RESET,
 	LB_PEER_EV_RX_RESET_ACK,
-	LB_PEER_EV_CONNECTION_SUCCESS,
-	LB_PEER_EV_CONNECTION_TIMEOUT,
+	LB_PEER_EV_AVAILABLE,
+	LB_PEER_EV_UNAVAILABLE,
 };
 
 struct lb_peer_ev_ctx {
@@ -60,8 +62,8 @@ struct lb_peer_ev_ctx {
 };
 
 struct lb_peer *lb_peer_find_or_create(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr);
-struct lb_peer *lb_peer_find(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr);
+struct lb_peer *lb_peer_find(const struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr);
+struct lb_peer *lb_peer_find_by_pc(const struct sccp_lb_inst *sli, uint32_t pc);
 
 int lb_peer_up_l2(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *calling_addr, bool co, uint32_t conn_id,
 		  struct msgb *l2);
-void lb_peer_disconnect(struct sccp_lb_inst *sli, uint32_t conn_id);

include/osmocom/smlc/smlc_data.h

@@ -37,6 +37,7 @@ enum smlc_ctrl_node {
 	_LAST_CTRL_NODE_SMLC
 };
 
+/* rate_ctr */
 enum {
 	SMLC_CTR_BSSMAP_LE_RX_UDT_RESET,
 	SMLC_CTR_BSSMAP_LE_RX_UDT_RESET_ACK,
@@ -58,3 +59,9 @@ enum {
 	SMLC_CTR_BSSMAP_LE_TX_DT1_PERFORM_LOCATION_RESPONSE,
 	SMLC_CTR_BSSMAP_LE_TX_DT1_BSSLAP_TA_REQUEST,
 };
+
+/* osmo_stat */
+enum {
+	SMLC_STAT_LB_PEERS_TOTAL,
+	SMLC_STAT_LB_PEERS_ACTIVE,
+};

include/osmocom/smlc/smlc_vty.h

@@ -5,3 +5,5 @@
 enum smlc_vty_node {
 	CELLS_NODE = _LAST_OSMOVTY_NODE + 1,
 };
+
+void smlc_vty_init(struct vty_app_info *vty_app_info);

src/Makefile.am

@@ -14,12 +14,6 @@ AM_CFLAGS = \
 	$(COVERAGE_CFLAGS) \
 	$(NULL)
 
-AM_LDFLAGS = \
-	$(LIBOSMOCORE_LIBS) \
-	$(LIBOSMOGSM_LIBS) \
-	$(COVERAGE_LDFLAGS) \
-	$(NULL)
-
 SUBDIRS = \
 	osmo-smlc \
 	$(NULL)

src/osmo-smlc/Makefile.am

@@ -32,6 +32,7 @@ osmo_smlc_SOURCES = \
 	smlc_loc_req.c \
 	smlc_main.c \
 	smlc_subscr.c \
+	smlc_vty.c \
 	$(NULL)
 
 osmo_smlc_LDADD = \
@@ -39,6 +40,5 @@ osmo_smlc_LDADD = \
 	$(LIBOSMOGSM_LIBS) \
 	$(LIBOSMOVTY_LIBS) \
 	$(LIBOSMOCTRL_LIBS) \
-	$(COVERAGE_LDFLAGS) \
 	$(LIBOSMOSIGTRAN_LIBS) \
 	$(NULL)

src/osmo-smlc/lb_conn.c

@@ -1,7 +1,7 @@
 /* SMLC Lb connection implementation */
 
 /*
- * (C) 2020 by sysmocom s.m.f.c. <info@sysmocom.de>
+ * (C) 2020 by sysmocom s.f.m.c. <info@sysmocom.de>
  * All Rights Reserved
  *
  * Author: Neels Hofmeyr

src/osmo-smlc/lb_peer.c

@@ -1,5 +1,5 @@
 /*
- * (C) 2019 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
+ * (C) 2019-2025 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
  * All Rights Reserved
  *
  * SPDX-License-Identifier: AGPL-3.0+
@@ -23,6 +23,7 @@
 #include <osmocom/core/linuxlist.h>
 #include <osmocom/core/logging.h>
 #include <osmocom/core/fsm.h>
+#include <osmocom/core/stat_item.h>
 #include <osmocom/gsm/bssmap_le.h>
 #include <osmocom/sigtran/sccp_helpers.h>
 
@@ -57,6 +58,7 @@ static struct lb_peer *lb_peer_alloc(struct sccp_lb_inst *sli, const struct osmo
 	fi->priv = lbp;
 
 	llist_add(&lbp->entry, &sli->lb_peers);
+	osmo_stat_item_inc(osmo_stat_item_group_get_item(g_smlc->statg, SMLC_STAT_LB_PEERS_TOTAL), 1);
 
 	return lbp;
 }
@@ -69,7 +71,7 @@ struct lb_peer *lb_peer_find_or_create(struct sccp_lb_inst *sli, const struct os
 	return lb_peer_alloc(sli, peer_addr);
 }
 
-struct lb_peer *lb_peer_find(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr)
+struct lb_peer *lb_peer_find(const struct sccp_lb_inst *sli, const struct osmo_sccp_addr *peer_addr)
 {
 	struct lb_peer *lbp;
 	llist_for_each_entry(lbp, &sli->lb_peers, entry) {
@@ -80,6 +82,15 @@ struct lb_peer *lb_peer_find(struct sccp_lb_inst *sli, const struct osmo_sccp_ad
 	return NULL;
 }
 
+/* Find an lb_peer by its remote SCCP address */
+struct lb_peer *lb_peer_find_by_pc(const struct sccp_lb_inst *sli, uint32_t pc)
+{
+	struct osmo_sccp_addr rem_addr;
+
+	osmo_sccp_make_addr_pc_ssn(&rem_addr, pc, OSMO_SCCP_SSN_BSC_BSSAP_LE);
+	return lb_peer_find(sli, &rem_addr);
+}
+
 static const struct osmo_tdef_state_timeout lb_peer_fsm_timeouts[32] = {
 	[LB_PEER_ST_WAIT_RX_RESET_ACK] = { .T = -13 },
 	[LB_PEER_ST_DISCARDING] = { .T = -14 },
@@ -88,7 +99,7 @@ static const struct osmo_tdef_state_timeout lb_peer_fsm_timeouts[32] = {
 #define lb_peer_state_chg(LB_PEER, NEXT_STATE) \
 	osmo_tdef_fsm_inst_state_chg((LB_PEER)->fi, NEXT_STATE, lb_peer_fsm_timeouts, g_smlc_tdefs, 5)
 
-void lb_peer_discard_all_conns(struct lb_peer *lbp)
+static void lb_peer_discard_all_conns(struct lb_peer *lbp)
 {
 	struct lb_conn *lb_conn, *next;
 
@@ -137,7 +148,7 @@ static void lb_peer_rx_reset_ack(struct lb_peer *lbp, struct msgb* msg)
 	lb_peer_state_chg(lbp, LB_PEER_ST_READY);
 }
 
-void lb_peer_reset(struct lb_peer *lbp)
+static void lb_peer_reset(struct lb_peer *lbp)
 {
 	struct bssap_le_pdu reset = {
 		.discr = BSSAP_LE_MSG_DISCR_BSSMAP_LE,
@@ -167,7 +178,18 @@ void lb_peer_reset(struct lb_peer *lbp)
 	}
 }
 
-void lb_peer_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+static void lb_peer_disconnect(struct sccp_lb_inst *sli, uint32_t conn_id)
+{
+	struct lb_conn *lb_conn;
+	llist_for_each_entry(lb_conn, &sli->lb_conns, entry) {
+		if (lb_conn->sccp_conn_id == conn_id) {
+			lb_conn_discard(lb_conn);
+			return;
+		}
+	}
+}
+
+static void lb_peer_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 {
 	struct lb_peer *lbp = fi->priv;
 	struct lb_peer_ev_ctx *ctx = data;
@@ -196,7 +218,7 @@ void lb_peer_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *dat
 	}
 }
 
-void lb_peer_st_wait_rx_reset(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+static void lb_peer_st_wait_rx_reset(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 {
 	struct lb_peer *lbp = fi->priv;
 	struct lb_peer_ev_ctx *ctx;
@@ -224,13 +246,22 @@ void lb_peer_st_wait_rx_reset(struct osmo_fsm_inst *fi, uint32_t event, void *da
 		lb_peer_rx_reset(lbp, msg);
 		return;
 
+	case LB_PEER_EV_AVAILABLE:
+		/* Send a RESET to the peer. */
+		lb_peer_reset(lbp);
+		return;
+
+	case LB_PEER_EV_UNAVAILABLE:
+		/* Do nothing, wait for peer to come up again. */
+		return;
+
 	default:
 		LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event));
 		return;
 	}
 }
 
-void lb_peer_st_wait_rx_reset_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+static void lb_peer_st_wait_rx_reset_ack(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 {
 	struct lb_peer *lbp = fi->priv;
 	struct lb_peer_ev_ctx *ctx;
@@ -259,13 +290,28 @@ void lb_peer_st_wait_rx_reset_ack(struct osmo_fsm_inst *fi, uint32_t event, void
 		lb_peer_rx_reset(lbp, msg);
 		return;
 
+	case LB_PEER_EV_AVAILABLE:
+		/* Send a RESET to the peer. */
+		lb_peer_reset(lbp);
+		return;
+
+	case LB_PEER_EV_UNAVAILABLE:
+		lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET);
+		return;
+
 	default:
 		LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event));
 		return;
 	}
 }
 
-void lb_peer_st_ready(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+static void lb_peer_st_ready_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state)
+{
+	if (prev_state != LB_PEER_ST_READY)
+		osmo_stat_item_inc(osmo_stat_item_group_get_item(g_smlc->statg, SMLC_STAT_LB_PEERS_ACTIVE), 1);
+}
+
+static void lb_peer_st_ready(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 {
 	struct lb_peer *lbp = fi->priv;
 	struct lb_peer_ev_ctx *ctx;
@@ -323,12 +369,28 @@ void lb_peer_st_ready(struct osmo_fsm_inst *fi, uint32_t event, void *data)
 		lb_peer_rx_reset(lbp, msg);
 		return;
 
+	case LB_PEER_EV_AVAILABLE:
+		/* Send a RESET to the peer. */
+		lb_peer_reset(lbp);
+		return;
+
+	case LB_PEER_EV_UNAVAILABLE:
+		lb_peer_discard_all_conns(lbp);
+		lb_peer_state_chg(lbp, LB_PEER_ST_WAIT_RX_RESET);
+		return;
+
 	default:
 		LOG_LB_PEER(lbp, LOGL_ERROR, "Unhandled event: %s\n", osmo_fsm_event_name(&lb_peer_fsm, event));
 		return;
 	}
 }
 
+static void lb_peer_st_ready_onleave(struct osmo_fsm_inst *fi, uint32_t next_state)
+{
+	if (next_state != LB_PEER_ST_READY)
+		osmo_stat_item_dec(osmo_stat_item_group_get_item(g_smlc->statg, SMLC_STAT_LB_PEERS_ACTIVE), 1);
+}
+
 static int lb_peer_fsm_timer_cb(struct osmo_fsm_inst *fi)
 {
 	struct lb_peer *lbp = fi->priv;
@@ -336,10 +398,17 @@ static int lb_peer_fsm_timer_cb(struct osmo_fsm_inst *fi)
 	return 0;
 }
 
-void lb_peer_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause)
+/* struct lb_peer destructor: */
+static void lb_peer_fsm_cleanup(struct osmo_fsm_inst *fi, enum osmo_fsm_term_cause cause)
 {
 	struct lb_peer *lbp = fi->priv;
+
 	lb_peer_discard_all_conns(lbp);
+
+	if (lbp->fi->state == LB_PEER_ST_READY)
+		osmo_stat_item_dec(osmo_stat_item_group_get_item(g_smlc->statg, SMLC_STAT_LB_PEERS_ACTIVE), 1);
+	osmo_stat_item_dec(osmo_stat_item_group_get_item(g_smlc->statg, SMLC_STAT_LB_PEERS_TOTAL), 1);
+
 	llist_del(&lbp->entry);
 }
 
@@ -352,8 +421,8 @@ static const struct value_string lb_peer_fsm_event_names[] = {
 	OSMO_VALUE_STRING(LB_PEER_EV_MSG_DOWN_CO),
 	OSMO_VALUE_STRING(LB_PEER_EV_RX_RESET),
 	OSMO_VALUE_STRING(LB_PEER_EV_RX_RESET_ACK),
-	OSMO_VALUE_STRING(LB_PEER_EV_CONNECTION_SUCCESS),
-	OSMO_VALUE_STRING(LB_PEER_EV_CONNECTION_TIMEOUT),
+	OSMO_VALUE_STRING(LB_PEER_EV_AVAILABLE),
+	OSMO_VALUE_STRING(LB_PEER_EV_UNAVAILABLE),
 	{}
 };
 
@@ -367,7 +436,8 @@ static const struct osmo_fsm_state lb_peer_fsm_states[] = {
 			| S(LB_PEER_EV_RX_RESET)
 			| S(LB_PEER_EV_MSG_UP_CO_INITIAL)
 			| S(LB_PEER_EV_MSG_UP_CO)
-			| S(LB_PEER_EV_CONNECTION_TIMEOUT)
+			| S(LB_PEER_EV_AVAILABLE)
+			| S(LB_PEER_EV_UNAVAILABLE)
 			,
 		.out_state_mask = 0
 			| S(LB_PEER_ST_WAIT_RX_RESET)
@@ -384,7 +454,8 @@ static const struct osmo_fsm_state lb_peer_fsm_states[] = {
 			| S(LB_PEER_EV_RX_RESET_ACK)
 			| S(LB_PEER_EV_MSG_UP_CO_INITIAL)
 			| S(LB_PEER_EV_MSG_UP_CO)
-			| S(LB_PEER_EV_CONNECTION_TIMEOUT)
+			| S(LB_PEER_EV_AVAILABLE)
+			| S(LB_PEER_EV_UNAVAILABLE)
 			,
 		.out_state_mask = 0
 			| S(LB_PEER_ST_WAIT_RX_RESET)
@@ -396,6 +467,8 @@ static const struct osmo_fsm_state lb_peer_fsm_states[] = {
 	[LB_PEER_ST_READY] = {
 		.name = "READY",
 		.action = lb_peer_st_ready,
+		.onenter = lb_peer_st_ready_onenter,
+		.onleave = lb_peer_st_ready_onleave,
 		.in_event_mask = 0
 			| S(LB_PEER_EV_RX_RESET)
 			| S(LB_PEER_EV_MSG_UP_CO_INITIAL)
@@ -403,6 +476,8 @@ static const struct osmo_fsm_state lb_peer_fsm_states[] = {
 			| S(LB_PEER_EV_MSG_DOWN_CO_INITIAL)
 			| S(LB_PEER_EV_MSG_DOWN_CO)
 			| S(LB_PEER_EV_MSG_DOWN_CL)
+			| S(LB_PEER_EV_AVAILABLE)
+			| S(LB_PEER_EV_UNAVAILABLE)
 			,
 		.out_state_mask = 0
 			| S(LB_PEER_ST_WAIT_RX_RESET)
@@ -482,14 +557,3 @@ int lb_peer_up_l2(struct sccp_lb_inst *sli, const struct osmo_sccp_addr *calling
 
 	return osmo_fsm_inst_dispatch(lb_peer->fi, event, &ctx);
 }
-
-void lb_peer_disconnect(struct sccp_lb_inst *sli, uint32_t conn_id)
-{
-	struct lb_conn *lb_conn;
-	llist_for_each_entry(lb_conn, &sli->lb_conns, entry) {
-		if (lb_conn->sccp_conn_id == conn_id) {
-			lb_conn_discard(lb_conn);
-			return;
-		}
-	}
-}

src/osmo-smlc/sccp_lb_inst.c

@@ -1,5 +1,5 @@
 /*
- * (C) 2020 by sysmocom - s.m.f.c. GmbH <info@sysmocom.de>
+ * (C) 2020-2025 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
  * All Rights Reserved
  *
  * SPDX-License-Identifier: AGPL-3.0+
@@ -85,6 +85,126 @@ struct sccp_lb_inst *sccp_lb_init(void *talloc_ctx, struct osmo_sccp_instance *s
 	return sli;
 }
 
+static void handle_notice_ind(struct sccp_lb_inst *sli, const struct osmo_scu_notice_param *ni)
+{
+	struct lb_peer *lbp;
+
+	lbp = lb_peer_find(sli, &ni->calling_addr);
+	if (!lbp) {
+		LOG_SCCP_LB(sli, LOGL_DEBUG, "(calling_addr=%s) N-NOTICE.ind cause=%u='%s' importance=%u didn't match any lb_peer, ignoring\n",
+			    osmo_sccp_addr_dump(&ni->calling_addr),
+			    ni->cause, osmo_sccp_return_cause_name(ni->cause),
+			    ni->importance);
+		return;
+	}
+
+	LOG_LB_PEER(lbp, LOGL_NOTICE, "N-NOTICE.ind cause=%u='%s' importance=%u\n",
+		     ni->cause, osmo_sccp_return_cause_name(ni->cause),
+		     ni->importance);
+
+	switch (ni->cause) {
+	case SCCP_RETURN_CAUSE_SUBSYSTEM_CONGESTION:
+	case SCCP_RETURN_CAUSE_NETWORK_CONGESTION:
+		/* Transient failures (hopefully), keep going. */
+		return;
+	default:
+		break;
+	}
+
+	/* Messages are not arriving to lb_peer. Signal it is unavailable to update local state. */
+	osmo_fsm_inst_dispatch(lbp->fi, LB_PEER_EV_UNAVAILABLE, NULL);
+}
+
+static void handle_pcstate_ind(struct sccp_lb_inst *sli, const struct osmo_scu_pcstate_param *pcst)
+{
+	struct osmo_ss7_instance *cs7 = osmo_sccp_get_ss7(sli->sccp);
+	struct lb_peer *lbp;
+	bool connected;
+	bool disconnected;
+
+	LOG_SCCP_LB(sli, LOGL_DEBUG, "N-PCSTATE ind: affected_pc=%u=%s sp_status=%s remote_sccp_status=%s\n",
+		    pcst->affected_pc, osmo_ss7_pointcode_print(cs7, pcst->affected_pc),
+		    osmo_sccp_sp_status_name(pcst->sp_status),
+		    osmo_sccp_rem_sccp_status_name(pcst->remote_sccp_status));
+
+	/* If we don't care about that point-code, ignore PCSTATE. */
+	lbp = lb_peer_find_by_pc(sli, pcst->affected_pc);
+	if (!lbp) {
+		LOG_SCCP_LB(sli, LOGL_DEBUG, "No lb_peer found under pc=%u=%s\n",
+			    pcst->affected_pc, osmo_ss7_pointcode_print(cs7, pcst->affected_pc));
+		return;
+	}
+
+	/* See if this marks the point code to have become available, or to have been lost.
+	 *
+	 * I want to detect two events:
+	 * - connection event (both indicators say PC is reachable).
+	 * - disconnection event (at least one indicator says the PC is not reachable).
+	 *
+	 * There are two separate incoming indicators with various possible values -- the incoming events can be:
+	 *
+	 * - neither connection nor disconnection indicated -- just indicating congestion
+	 *   connected == false, disconnected == false --> do nothing.
+	 * - both incoming values indicate that we are connected
+	 *   --> trigger connected
+	 * - both indicate we are disconnected
+	 *   --> trigger disconnected
+	 * - one value indicates 'connected', the other indicates 'disconnected'
+	 *   --> trigger disconnected
+	 *
+	 * Congestion could imply that we're connected, but it does not indicate that a PC's reachability changed, so no need to
+	 * trigger on that.
+	 */
+	connected = false;
+	disconnected = false;
+
+	switch (pcst->sp_status) {
+	case OSMO_SCCP_SP_S_ACCESSIBLE:
+		connected = true;
+		break;
+	case OSMO_SCCP_SP_S_INACCESSIBLE:
+		disconnected = true;
+		break;
+	default:
+	case OSMO_SCCP_SP_S_CONGESTED:
+		/* Neither connecting nor disconnecting */
+		break;
+	}
+
+	switch (pcst->remote_sccp_status) {
+	case OSMO_SCCP_REM_SCCP_S_AVAILABLE:
+		if (!disconnected)
+			connected = true;
+		break;
+	case OSMO_SCCP_REM_SCCP_S_UNAVAILABLE_UNKNOWN:
+	case OSMO_SCCP_REM_SCCP_S_UNEQUIPPED:
+	case OSMO_SCCP_REM_SCCP_S_INACCESSIBLE:
+		disconnected = true;
+		connected = false;
+		break;
+	default:
+	case OSMO_SCCP_REM_SCCP_S_CONGESTED:
+		/* Neither connecting nor disconnecting */
+		break;
+	}
+
+	if (disconnected) {
+		LOG_SCCP_LB(sli, LOGL_NOTICE,
+			    "now unreachable: N-PCSTATE ind: pc=%u=%s sp_status=%s remote_sccp_status=%s\n",
+			    pcst->affected_pc, osmo_ss7_pointcode_print(cs7, pcst->affected_pc),
+			    osmo_sccp_sp_status_name(pcst->sp_status),
+			    osmo_sccp_rem_sccp_status_name(pcst->remote_sccp_status));
+		osmo_fsm_inst_dispatch(lbp->fi, LB_PEER_EV_UNAVAILABLE, NULL);
+	} else if (connected) {
+		LOG_SCCP_LB(sli, LOGL_NOTICE,
+			    "now available: N-PCSTATE ind: pc=%u=%s sp_status=%s remote_sccp_status=%s\n",
+			    pcst->affected_pc, osmo_ss7_pointcode_print(cs7, pcst->affected_pc),
+			    osmo_sccp_sp_status_name(pcst->sp_status),
+			    osmo_sccp_rem_sccp_status_name(pcst->remote_sccp_status));
+		osmo_fsm_inst_dispatch(lbp->fi, LB_PEER_EV_AVAILABLE, NULL);
+	}
+}
+
 static int sccp_lb_sap_up(struct osmo_prim_hdr *oph, void *_scu)
 {
 	struct osmo_sccp_user *scu = _scu;
@@ -163,6 +283,24 @@ static int sccp_lb_sap_up(struct osmo_prim_hdr *oph, void *_scu)
 		rc = lb_peer_up_l2(sli, peer_addr, false, 0, oph->msg);
 		break;
 
+	case OSMO_PRIM(OSMO_SCU_PRIM_N_NOTICE, PRIM_OP_INDICATION):
+		handle_notice_ind(sli, &prim->u.notice);
+		rc = 0;
+		break;
+
+	case OSMO_PRIM(OSMO_SCU_PRIM_N_PCSTATE, PRIM_OP_INDICATION):
+		handle_pcstate_ind(sli, &prim->u.pcstate);
+		rc = 0;
+		break;
+
+	case OSMO_PRIM(OSMO_SCU_PRIM_N_STATE, PRIM_OP_INDICATION):
+		LOG_SCCP_LB(sli, LOGL_INFO,
+			    "SCCP-User-SAP: Ignoring %s.%s\n",
+			    osmo_scu_prim_type_name(oph->primitive),
+			    get_value_string(osmo_prim_op_names, oph->operation));
+		rc = 0;
+		break;
+
 	default:
 		LOG_SCCP_LB_CL(sli, NULL, LOGL_ERROR, "%s(%s) unsupported\n", __func__, osmo_scu_prim_name(oph));
 		rc = -1;

src/osmo-smlc/smlc_data.c

@@ -54,6 +54,19 @@ static const struct rate_ctr_group_desc smlc_ctrg_desc = {
 	smlc_ctr_description,
 };
 
+static const struct osmo_stat_item_desc smlc_stat_item_description[] = {
+	[SMLC_STAT_LB_PEERS_TOTAL]	= { "lb_peers.total", "Total Lb peers seen since startup", OSMO_STAT_ITEM_NO_UNIT, 4, 0},
+	[SMLC_STAT_LB_PEERS_ACTIVE]	= { "lb_peers.active", "Currently active Lb peers", OSMO_STAT_ITEM_NO_UNIT, 4, 0},
+};
+
+static const struct osmo_stat_item_group_desc smlc_statg_desc = {
+	"smlc",
+	"serving mobile location center",
+	OSMO_STATS_CLASS_GLOBAL,
+	ARRAY_SIZE(smlc_stat_item_description),
+	smlc_stat_item_description,
+};
+
 struct smlc_state *smlc_state_alloc(void *ctx)
 {
 	struct smlc_state *smlc = talloc_zero(ctx, struct smlc_state);
@@ -61,5 +74,14 @@ struct smlc_state *smlc_state_alloc(void *ctx)
 	INIT_LLIST_HEAD(&smlc->subscribers);
 	INIT_LLIST_HEAD(&smlc->cell_locations);
 	smlc->ctrs = rate_ctr_group_alloc(smlc, &smlc_ctrg_desc, 0);
+
+	smlc->statg = osmo_stat_item_group_alloc(smlc, &smlc_statg_desc, 0);
+	if (!smlc->statg)
+		goto ret_free;
 	return smlc;
+
+ret_free:
+	rate_ctr_group_free(smlc->ctrs);
+	talloc_free(smlc);
+	return NULL;
 }

src/osmo-smlc/smlc_main.c

@@ -19,7 +19,6 @@
 #include <osmocom/ctrl/control_cmd.h>
 #include <osmocom/ctrl/control_if.h>
 #include <osmocom/ctrl/ports.h>
-#include <osmocom/ctrl/control_vty.h>
 
 #include <osmocom/core/application.h>
 #include <osmocom/core/linuxlist.h>
@@ -29,17 +28,15 @@
 #include <osmocom/core/rate_ctr.h>
 #include <osmocom/vty/telnet_interface.h>
 #include <osmocom/vty/ports.h>
-#include <osmocom/vty/logging.h>
-#include <osmocom/vty/command.h>
-#include <osmocom/vty/misc.h>
 
 #include <osmocom/sigtran/xua_msg.h>
 #include <osmocom/sigtran/sccp_sap.h>
+#include <osmocom/sigtran/osmo_ss7.h>
 
 #include <osmocom/smlc/debug.h>
 #include <osmocom/smlc/smlc_data.h>
 #include <osmocom/smlc/sccp_lb_inst.h>
-#include <osmocom/smlc/cell_locations.h>
+#include <osmocom/smlc/smlc_vty.h>
 
 #define _GNU_SOURCE
 #include <getopt.h>
@@ -170,6 +167,7 @@ static struct vty_app_info vty_info = {
 	"This is free software: you are free to change and redistribute it.\r\n"
 	"There is NO WARRANTY, to the extent permitted by law.\r\n",
 	.version	= PACKAGE_VERSION,
+	.go_parent_cb	= osmo_ss7_vty_go_parent,
 };
 
 static void signal_handler(int signal)
@@ -239,17 +237,11 @@ int main(int argc, char **argv)
 
 	g_smlc = smlc_state_alloc(tall_smlc_ctx);
 
-	/* This needs to precede handle_options() */
-	vty_init(&vty_info);
-	logging_vty_add_cmds();
-	osmo_talloc_vty_add_cmds();
-	ctrl_vty_init(tall_smlc_ctx);
-	cell_locations_vty_init();
-
 	/* Initialize SS7 */
 	OSMO_ASSERT(osmo_ss7_init() == 0);
-	osmo_ss7_vty_init_asp(tall_smlc_ctx);
-	osmo_sccp_vty_init();
+
+	/* This needs to precede handle_options() */
+	smlc_vty_init(&vty_info);
 
 	/* parse options */
 	handle_options(argc, argv);
@@ -262,7 +254,7 @@ int main(int argc, char **argv)
 	}
 
 	/* Start telnet interface after reading config for vty_get_bind_addr() */
-	rc = telnet_init_dynif(tall_smlc_ctx, g_smlc, vty_get_bind_addr(), OSMO_VTY_PORT_SMLC);
+	rc = telnet_init_default(tall_smlc_ctx, g_smlc, OSMO_VTY_PORT_SMLC);
 	if (rc < 0)
 		exit(1);
 

src/osmo-smlc/smlc_vty.c

@@ -0,0 +1,48 @@
+/*
+ * (C) 2025 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
+ * All Rights Reserved
+ *
+ * SPDX-License-Identifier: AGPL-3.0+
+ *
+ * Author: Pau Espin Pedrol
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <osmocom/ctrl/control_vty.h>
+#include <osmocom/vty/logging.h>
+#include <osmocom/vty/misc.h>
+#include <osmocom/vty/stats.h>
+#include <osmocom/vty/vty.h>
+
+#include <osmocom/sigtran/osmo_ss7.h>
+#include <osmocom/sigtran/sccp_sap.h>
+
+#include <osmocom/smlc/cell_locations.h>
+
+void smlc_vty_init(struct vty_app_info *vty_app_info)
+{
+	vty_init(vty_app_info);
+
+	logging_vty_add_cmds();
+	osmo_talloc_vty_add_cmds();
+	ctrl_vty_init(vty_app_info->tall_ctx);
+	osmo_fsm_vty_add_cmds();
+	osmo_stats_vty_add_cmds();
+
+	osmo_ss7_vty_init_asp(vty_app_info->tall_ctx);
+	osmo_sccp_vty_init();
+
+	cell_locations_vty_init();
+}

tests/Makefile.am

@@ -37,11 +37,13 @@ DISTCLEANFILES = \
 	$(NULL)
 
 if ENABLE_EXT_TESTS
-python-tests: $(BUILT_SOURCES)
+python-tests: $(top_builddir)/src/osmo-smlc/osmo-smlc
 	$(MAKE) vty-test
 	$(MAKE) ctrl-test
+	osmotestvty.py -p $(abs_top_srcdir) -w $(abs_top_builddir) -v
+	osmotestconfig.py -p $(abs_top_srcdir) -w $(abs_top_builddir) -v
 else
-python-tests: $(BUILT_SOURCES)
+python-tests:
 	echo "Not running python-based tests (determined at configure-time)"
 endif
 
@@ -51,7 +53,7 @@ VTY_TEST ?= *.vty
 # To update the VTY script from current application behavior,
 # pass -u to vty_script_runner.py by doing:
 #   make vty-test U=-u
-vty-test:
+vty-test: $(top_builddir)/src/osmo-smlc/osmo-smlc
 	osmo_verify_transcript_vty.py -v \
 		-n OsmoSMLC -p 4271 \
 		-r "$(top_builddir)/src/osmo-smlc/osmo-smlc -c $(top_srcdir)/tests/osmo-smlc.cfg" \
@@ -60,14 +62,11 @@ vty-test:
 # To update the CTRL script from current application behavior,
 # pass -u to ctrl_script_runner.py by doing:
 #   make ctrl-test U=-u
-ctrl-test:
-	-rm -f $(CTRL_TEST_DB)
+ctrl-test: $(top_builddir)/src/osmo-smlc/osmo-smlc
 	osmo_verify_transcript_ctrl.py -v \
 		-p 4272 \
 		-r "$(top_builddir)/src/osmo-smlc/osmo-smlc -c $(top_srcdir)/tests/osmo-smlc.cfg" \
 		$(U) $(srcdir)/*.ctrl
-	-rm -f $(CTRL_TEST_DB)
-	-rm $(CTRL_TEST_DB)-*
 
 check-local: atconfig $(TESTSUITE)
 	$(SHELL) '$(TESTSUITE)' $(TESTSUITEFLAGS)