Use RRC establishment cause mo-signalling for NAS Attach procedure

srsue/src/stack/ue_stack_lte.cc

@@ -180,7 +180,7 @@ bool ue_stack_lte::switch_on()
 {
   if (running) {
     pending_tasks.try_push(ue_queue_id,
-                           [this]() { nas.start_attach_request(nullptr, srslte::establishment_cause_t::mo_data); });
+                           [this]() { nas.start_attach_request(nullptr, srslte::establishment_cause_t::mo_sig); });
 
     // schedule airplane mode on command
     if (args.sim.airplane_t_on_ms > 0) {
@@ -189,7 +189,6 @@ bool ue_stack_lte::switch_on()
         disable_data();
       });
     }
-
     return true;
   }
   return false;

srsue/src/stack/upper/nas.cc

@@ -124,7 +124,7 @@ proc_outcome_t nas::plmn_search_proc::react(const plmn_search_complete_t& t)
   nas_ptr->rrc->plmn_select(nas_ptr->current_plmn);
 
   state = state_t::rrc_connect;
-  if (not nas_ptr->rrc_connector.launch(srslte::establishment_cause_t::mo_data, nullptr)) {
+  if (not nas_ptr->rrc_connector.launch(srslte::establishment_cause_t::mo_sig, nullptr)) {
     ProcError("Unable to initiate RRC connection.\n");
     return proc_outcome_t::error;
   }