[nrf fromtree] tests: bluetooth: tester: Make brcst_source_stop synchronous

- Add semaphore to make sure source is stopped before proceeding
- This ensures source can be released after this command is finished

Signed-off-by: Alexander Svensen <[email protected]>
(cherry picked from commit 6d19fc2)

Author: alexsven

tests/bluetooth/tester/src/audio/btp_cap.c

@@ -153,11 +153,19 @@ static void unicast_stop_complete_cb(int err, struct bt_conn *conn)
 					       BTP_CAP_UNICAST_START_STATUS_SUCCESS);
 }
 
+static void broadcast_stopped_cb(struct bt_cap_broadcast_source *source, uint8_t reason)
+{
+	LOG_DBG("");
+
+	k_sem_give(&source_stopped_sem);
+}
+
 static struct bt_cap_initiator_cb cap_cb = {
 	.unicast_discovery_complete = cap_discovery_complete_cb,
 	.unicast_start_complete = unicast_start_complete_cb,
 	.unicast_update_complete = unicast_update_complete_cb,
 	.unicast_stop_complete = unicast_stop_complete_cb,
+	.broadcast_stopped = broadcast_stopped_cb,
 };
 
 static uint8_t btp_cap_supported_commands(const void *cmd, uint16_t cmd_len,
@@ -854,6 +862,14 @@ static uint8_t btp_cap_broadcast_source_stop(const void *cmd, uint16_t cmd_len,
 		return BTP_STATUS_FAILED;
 	}
 
+	/* Make sure source is stopped before proceeding */
+	err = k_sem_take(&source_stopped_sem, K_SECONDS(1));
+	if (err) {
+		LOG_ERR("Semaphore timed out: %d", err);
+
+		return BTP_STATUS_FAILED;
+	}
+
 	return BTP_STATUS_SUCCESS;
 }