ms_srs: add short_sn as config option for srsUE

this allows to change the announced support for PDCP
short sequence number lengths

Change-Id: Ibcf72dbb424ae3b6a87b60febb4dadf716407612

src/osmo_gsm_tester/obj/ms_srs.py

@@ -53,7 +53,8 @@ def on_register_schemas():
     config_schema = {
         'enable_pcap': schema.BOOL_STR,
         'log_all_level': schema.STR,
-        'log_nas_level': schema.STR
+        'log_nas_level': schema.STR,
+        'nr_short_sn_support': schema.BOOL_STR
         }
     schema.register_config_schema('modem', config_schema)
 

sysmocom/defaults.conf

@@ -187,6 +187,7 @@ srsue:
   log_all_level: warning
   log_nas_level: warning
   force_ul_amplitude: 0
+  nr_short_sn_support: true
 
 amarisoftue:
   tx_gain: 89