ue,rrc_nr: Add dummy handler for RRC Release to avoid logging an unhandled message error

srsue/hdr/stack/rrc_nr/rrc_nr.h

@@ -148,6 +148,7 @@ private:
   void handle_rrc_reconfig(const asn1::rrc_nr::rrc_recfg_s& reconfig);
   void handle_dl_info_transfer(const asn1::rrc_nr::dl_info_transfer_s& dl_info_transfer);
   void handle_security_mode_command(const asn1::rrc_nr::security_mode_cmd_s& smc);
+  void handle_rrc_release(const asn1::rrc_nr::rrc_release_s& rrc_release);
   void generate_as_keys();
 
   srsran::task_sched_handle task_sched;

srsue/src/stack/rrc_nr/rrc_nr.cc

@@ -311,6 +311,11 @@ void rrc_nr::decode_dl_dcch(uint32_t lcid, unique_byte_buffer_t pdu)
       task_sched.defer_task([this, smc]() { handle_security_mode_command(smc); });
       break;
     }
+    case dl_dcch_msg_type_c::c1_c_::types::rrc_release: {
+      rrc_release_s rrc_release = c1->rrc_release();
+      task_sched.defer_task([this, rrc_release]() { handle_rrc_release(rrc_release); });
+      break;
+    }
     default:
       logger.error("The provided DL-DCCH message type is not recognized or supported");
       break;
@@ -2117,6 +2122,11 @@ void rrc_nr::handle_security_mode_command(const asn1::rrc_nr::security_mode_cmd_
   pdcp->enable_encryption(lcid, DIRECTION_TXRX);
 }
 
+void rrc_nr::handle_rrc_release(const asn1::rrc_nr::rrc_release_s& rrc_release)
+{
+  logger.info("RRC Release not handled yet");
+}
+
 // Security helper used by Security Mode Command and Mobility handling routines
 void rrc_nr::generate_as_keys()
 {