bluetooth: audio: Update bad code in BASS to be v1.0.1 compliant

Bad Broadcast Code in BASS/Scan Delegator if BIG_Encryption
field value = 0x03 (Bad_Code), Bad_Code shall be set to the
value 0xFFFFFFFF FFFFFFFF FFFFFFFF FFFFFFFF according to BASS v1.0.1

Signed-off-by: Gudipudi Ramana Kumar <gudipudiramanakumar@gmail.com>

Author: gudipudiramanakumar

subsys/bluetooth/audio/bap_scan_delegator.c

@@ -1372,8 +1372,7 @@ int bt_bap_scan_delegator_set_bis_sync_state(
 		internal_state->index, src_id);
 
 	if (internal_state->state.encrypt_state == BT_BAP_BIG_ENC_STATE_BAD_CODE) {
-		(void)memcpy(internal_state->state.bad_code,
-			     internal_state->broadcast_code,
+		(void)memset(internal_state->state.bad_code, 0xFF,
 			     sizeof(internal_state->state.bad_code));
 	}
 
@@ -1570,8 +1569,7 @@ int bt_bap_scan_delegator_mod_src(const struct bt_bap_scan_delegator_mod_src_par
 		state->encrypt_state = param->encrypt_state;
 
 		if (state->encrypt_state == BT_BAP_BIG_ENC_STATE_BAD_CODE) {
-			(void)memcpy(state->bad_code, internal_state->broadcast_code,
-				     sizeof(internal_state->state.bad_code));
+			(void)memset(state->bad_code, 0xFF, sizeof(internal_state->state.bad_code));
 		}
 
 		state_changed = true;

tests/bsim/bluetooth/audio/src/bap_broadcast_assistant_test.c

@@ -142,7 +142,7 @@ static void bap_broadcast_assistant_recv_state_cb(
 		SET_FLAG(flag_broadcast_code_requested);
 	} else if (state->encrypt_state == BT_BAP_BIG_ENC_STATE_BAD_CODE) {
 		SET_FLAG(flag_incorrect_broadcast_code);
-		if (memcmp(state->bad_code, INCORRECT_BROADCAST_CODE, BT_ISO_BROADCAST_CODE_SIZE) !=
+		if (memcmp(state->bad_code, BAD_BROADCAST_CODE, BT_ISO_BROADCAST_CODE_SIZE) !=
 		    0) {
 			FAIL("Bad code is not what we sent\n");
 			return;

tests/bsim/bluetooth/audio/src/bap_common.h

@@ -48,6 +48,9 @@
 #define INCORRECT_BROADCAST_CODE                                                                   \
 	((uint8_t[]){0xDE, 0xAD, 0xBE, 0xEF, 0x44, 0x55, 0x66, 0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc, \
 		     0xdd, 0xee, 0xff})
+#define BAD_BROADCAST_CODE                                                                         \
+	((uint8_t[]){0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, \
+		     0xFF, 0xFF, 0xFF})
 
 #define BAP_RETRY_WAIT K_MSEC(100)