applications: nrf5340_audio: Added handling as scan delegator

Removed scanning code on BTN5 press
Added handling of pairing complete event, which is relevant for
scan delegators as they depend on a broadcast assistant to
transfer the broadcast source info.
OCT-3668

Signed-off-by: Kristoffer Skøien <kristoffer.skoien@nordicsemi.no>

Author: koffes

applications/nrf5340_audio/broadcast_sink/main.c

@@ -144,6 +144,14 @@ static void button_msg_sub_thread(void)
 				break;
 			}
 
+			if (IS_ENABLED(CONFIG_BT_AUDIO_SCAN_DELEGATOR)) {
+				/* If this device is a scan delegator, we depend on a broadcast
+				 * assistant to transfer the broadcast source info.
+				 * It should not scan by itself.
+				 */
+				break;
+			}
+
 			ret = broadcast_sink_disable();
 			if (ret) {
 				LOG_ERR("Failed to disable the broadcast sink: %d", ret);
@@ -339,6 +347,11 @@ static void bt_mgmt_msg_sub_thread(void)
 			LOG_DBG("Security changed");
 			break;
 
+		case BT_MGMT_PAIRING_COMPLETE:
+			/* If this device is a scan delegator */
+			LOG_DBG("Pairing complete");
+			break;
+
 		case BT_MGMT_PA_SYNCED:
 			LOG_DBG("PA synced");