component/bt: fix type error for ble_spp_client when SUPPORT_HEARTBEAT is enabled
@@ -493,7 +493,7 @@ void spp_heart_beat_task(void * arg)
spp_conn_id,
(db+SPP_IDX_SPP_HEARTBEAT_VAL)->attribute_handle,
sizeof(heartbeat_s),
- (char *)heartbeat_s,
+ (uint8_t *)heartbeat_s,
ESP_GATT_WRITE_TYPE_RSP,
ESP_GATT_AUTH_REQ_NONE);
vTaskDelay(5000 / portTICK_PERIOD_MS);
