Assume we only run one Logitech Media server on a host.

Because the LMS discovery mechanism uses the SlimProto protocol to discover the
presence of a Logitech Media server which operates on port 3483/udp and
3483/tcp. But HA uses a different 'CLI' protocol that is typically on port
9090/tcp to query player state.

However the CLI port number is configurable and if someone runs the CLI on a
different port, and has the server configured in configuration.yaml, we get an
error in the logs when we try to connect to 9090/tcp when we find the server
through discovery. Because of the way local slim player discover the server
using SlimProto we can be fairly certain only a single server will run on a
given IP address so if one is already configured with a user defined port, we
should ignore the discovered one that assumes the default port.

homeassistant/components/media_player/squeezebox.py

@@ -42,9 +42,9 @@ def setup_platform(hass, config, add_devices, discovery_info=None):
         return False
 
     # Only add a media server once
-    if (host, port) in KNOWN_DEVICES:
+    if host in KNOWN_DEVICES:
         return False
-    KNOWN_DEVICES.append((host, port))
+    KNOWN_DEVICES.append(host)
 
     lms = LogitechMediaServer(
         host, port,