Volume argument must be an integer

[jjwBullfrog]

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Home Assistant release (hass --version):

Component/platform:
Onkyo

Description of problem:

Got this error when adjusting the volume slider.

Thu Nov 14 2019 17:54:42 GMT-0600 (Central Standard Time)
argument must be an int, or have a fileno() method.
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/components/websocket_api/commands.py", line 133, in handle_call_service
connection.context(msg),
File "/usr/src/homeassistant/homeassistant/core.py", line 1236, in async_call
await asyncio.shield(self._execute_service(handler, service_call))
File "/usr/src/homeassistant/homeassistant/core.py", line 1261, in _execute_service
await handler.func(service_call)
File "/usr/src/homeassistant/homeassistant/helpers/entity_component.py", line 213, in handle_service
self._platforms.values(), func, call, service_name, required_features
File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 348, in entity_service_call
future.result() # pop exception if have
File "/usr/src/homeassistant/homeassistant/helpers/service.py", line 372, in _handle_service_platform_call
await func(entity, data)
File "/usr/local/lib/python3.7/concurrent/futures/thread.py", line 57, in run
result = self.fn(*self.args, **self.kwargs)
File "/usr/src/homeassistant/homeassistant/components/onkyo/media_player.py", line 355, in set_volume_level
f"volume {int(volume * (self._max_volume / 100) * self._receiver_max_volume)}"
File "/usr/src/homeassistant/homeassistant/components/onkyo/media_player.py", line 244, in command
result = self._receiver.command(command)
File "/usr/local/lib/python3.7/site-packages/eiscp/core.py", line 480, in command
response = self.raw(iscp_message)
File "/usr/local/lib/python3.7/site-packages/eiscp/core.py", line 464, in raw
while self.get(False):
File "/usr/local/lib/python3.7/site-packages/eiscp/core.py", line 443, in get
ready = select.select([self.command_socket], [], [], timeout or 0)
TypeError: argument must be an int, or have a fileno() method.

Expected:

Problem-relevant configuration.yaml entries and steps to reproduce:
media_player:

• platform: onkyo
  host: 192.168.1.76
  name: 'Pioneer Receiver'
  max_volume: 100
  receiver_max_volume: 164