set vto channel correctly (#299)

custom_components/dahua/__init__.py

@@ -191,14 +191,6 @@ async def _async_update_data(self):
  # Do the one time initialization (do this when Home Assistant starts)
  if not self.initialized:
  try:
- try:
- await self.client.async_get_snapshot(0)
- # If able to take a snapshot with index 0 then most likely this cams channel needs to be reset
- self._channel_number = self._channel
- except ClientError:
- pass
- _LOGGER.info("Using channel number %s", self._channel_number)
-
  # Find the max number of streams. 1 main stream + n number of sub-streams
  self._max_streams = await self.client.get_max_extra_streams() + 1
  _LOGGER.info("Using max streams %s", self._max_streams)
@@ -229,6 +221,16 @@ async def _async_update_data(self):
  self.machine_name = data.get("table.General.MachineName")
  self._serial_number = data.get("serialNumber")
 
+ try:
+ await self.client.async_get_snapshot(0)
+ # If able to take a snapshot with index 0 then most likely this cams channel needs to be reset
+ # but check if unit is not a doorbell first as channel 0 doesnt exist for VTOs
+ if not self.is_doorbell():
+ self._channel_number = self._channel
+ except ClientError:
+ pass
+ _LOGGER.info("Using channel number %s", self._channel_number)
+
  try:
  await self.client.async_get_coaxial_control_io_status()
  self._supports_coaxial_control = True