applications: nrf5340_audio: Use FICR to set fixed broadcast ID

- Read NFC tag register to use as a unique fixed broadcast ID
- Add option to choose between:
  - FICR based fixed ID
  - CONFIG based fixed ID
  - Random generated ID
- Delete forgotten Kconfig.default for broadcast_source
- OCT-3350

Signed-off-by: Alexander Svensen <[email protected]>

Author: alexsven

applications/nrf5340_audio/broadcast_source/Kconfig.defaults

@@ -406,9 +406,19 @@ static int ext_adv_populate(uint8_t big_index, struct broadcast_source_ext_adv_d
 		return ret;
 	}
 
+	uint32_t broadcast_id = 0x000000;
 	bool fixed_id = !IS_ENABLED(CONFIG_BT_AUDIO_USE_BROADCAST_ID_RANDOM);
 
-	uint32_t broadcast_id = CONFIG_BT_AUDIO_BROADCAST_ID_FIXED;
+	if (IS_ENABLED(CONFIG_BT_AUDIO_USE_BROADCAST_ID_FICR)) {
+		LOG_DBG("Using FICR ID");
+		broadcast_id = NRF_FICR->NFC.TAGHEADER0 >> 8;
+	} else if (IS_ENABLED(CONFIG_BT_AUDIO_USE_BROADCAST_ID_FIXED)) {
+		LOG_DBG("Using fixed ID");
+		broadcast_id = CONFIG_BT_AUDIO_BROADCAST_ID_FIXED;
+	} else {
+		LOG_DBG("Using random broadcast ID");
+		/* The random broadcast ID will be generated by the Bluetooth module */
+	}
 
 	ret = broadcast_source_ext_adv_populate(big_index, fixed_id, broadcast_id, ext_adv_data,
 						&ext_adv_buf[ext_adv_buf_cnt],

applications/nrf5340_audio/broadcast_source/main.c

@@ -132,19 +132,40 @@ config BT_AUDIO_BROADCAST_ENCRYPTION_KEY
 	  characters. Encryption keys larger than BT_ISO_BROADCAST_CODE_SIZE will be truncated to
 	  BT_ISO_BROADCAST_CODE_SIZE.
 
+choice BT_AUDIO_BROADCAST_ID_TYPE
+	prompt "Broadcast ID"
+	depends on TRANSPORT_BIS
+	default BT_AUDIO_USE_BROADCAST_ID_FICR
+	help
+	  Select the broadcast ID to use for the broadcast.
+
+config BT_AUDIO_USE_BROADCAST_ID_FICR
+	bool "Use the FICR broadcast ID"
+	depends on TRANSPORT_BIS
+	help
+	  Use the FICR broadcast ID. This is a fixed broadcast ID that is unique to each device.
+	  It is stored in the FICR NFC.TAGHEADER0 register.
+
 config BT_AUDIO_USE_BROADCAST_ID_RANDOM
 	bool "Use a random broadcast ID"
 	depends on TRANSPORT_BIS
-	default y
 	help
 	  Use a randomly generated broadcast ID.
 
+config BT_AUDIO_USE_BROADCAST_ID_FIXED
+	bool "Use a fixed broadcast ID"
+	depends on TRANSPORT_BIS
+	help
+	  Use a fixed broadcast ID. This is useful for debugging purposes.
+
+endchoice
+
 config BT_AUDIO_BROADCAST_ID_FIXED
 	hex "Fixed broadcast ID"
 	depends on TRANSPORT_BIS
 	default 0x123456
 	help
-	  Fixed broadcast ID; 3 octets. Will only be used if BT_AUDIO_USE_BROADCAST_ID_RANDOM=n.
+	  Fixed broadcast ID; 3 octets. Will only be used if BT_AUDIO_USE_BROADCAST_ID_FIXED=y.
 	  Only use for debugging.
 
 config BT_AUDIO_BROADCAST_PBA_METADATA_SIZE

applications/nrf5340_audio/src/bluetooth/bt_stream/broadcast/Kconfig

@@ -198,8 +198,9 @@ Matter bridge
 
 nRF5340 Audio
 -------------
+* Updated:
 
-|no_changes_yet_note|
+  * The application to use the ``NFC.TAGHEADER0`` value from FICR as the broadcast ID instead of using a random ID.
 
 nRF Desktop
 -----------