enb: expose RRC inactivity timer

allow the user to specifiy the RRC inactiviy timer used in the eNB.
set the default value to 20s

Change-Id: I6a264b8dee893b883d40a48831cbb47eb15e1e7b

src/osmo_gsm_tester/obj/enb.py

@@ -35,6 +35,7 @@ def on_register_schemas():
         'rf_dev_type': schema.STR,
         'rf_dev_args': schema.STR,
         'additional_args[]': schema.STR,
+        'inactivity_timer': schema.INT,
         'enable_measurements': schema.BOOL_STR,
         'enable_dl_awgn': schema.BOOL_STR,
         'dl_awgn_snr': schema.INT,
@@ -99,6 +100,8 @@ class eNodeB(log.Origin, metaclass=ABCMeta):
         self._txmode = int(values['enb'].get('transmission_mode', None))
         assert self._txmode
         config.overlay(values, dict(enb={ 'num_ports': self.num_ports() }))
+        self._inactivity_timer = int(values['enb'].get('inactivity_timer', None))
+        assert self._inactivity_timer
         assert self._epc is not None
         config.overlay(values, dict(enb={ 'addr': self.addr() }))
         config.overlay(values, dict(enb={ 'mme_addr': self._epc.addr() }))

src/osmo_gsm_tester/templates/amarisoft_enb.cfg.tmpl

@@ -223,7 +223,7 @@
 
     /* (in ms) send RRC connection release after this time of network
        inactivity */
-    inactivity_timer: 10000,
+    inactivity_timer: ${enb.inactivity_timer},
 
     /* SRB configuration */
     srb_config: [

src/osmo_gsm_tester/templates/srsenb.conf.tmpl

@@ -272,7 +272,7 @@ enable = false
 #pregenerate_signals  = false
 #tx_amplitude         = 0.6
 #link_failure_nof_err = 50
-rrc_inactivity_timer = 5000
+rrc_inactivity_timer = ${enb.inactivity_timer}
 #max_prach_offset_us  = 30
 #eea_pref_list = EEA0, EEA2, EEA1
 #eia_pref_list = EIA2, EIA1, EIA0

sysmocom/defaults.conf

@@ -112,6 +112,7 @@ enb:
   mnc: 70
   transmission_mode: 1
   num_cells: 1
+  inactivity_timer: 20000
   enable_measurements: false
   enable_dl_awgn: false
   dl_awgn_snr: 30