Handle multiple TVs correctly

We have to lookup device from passed-in entity_id rather than from
bound "device" variable.

The registration of services is only really need to be done once but
it's still done multiple times if multiple bravia platforms are defined.
I haven't changed that as HA seems to handle it itself and doesn't
register duplicate services (it overrides the previous one).

Fixes #37

custom_components/braviatv_psk/media_player.py

@@ -174,6 +174,8 @@
     {vol.Required(ATTR_ENTITY_ID): cv.entity_id, vol.Required(ATTR_URI): cv.string}
 )
 
+registered_devices = []
+
 # pylint: disable=unused-argument
 
 
@@ -192,6 +194,14 @@ def convert_time_format(time_format, time_raw):
     return time_raw
 
 
+def lookup_registered_device(entity_id):
+    """Lookup registered Bravia device by entity_id."""
+    for device in registered_devices:
+        if device.entity_id == entity_id:
+            return device
+    return None
+
+
 async def async_setup_platform(hass, config, add_devices, discovery_info=None):
     """Set up the Sony Bravia TV platform."""
     host = config.get(CONF_HOST)
@@ -221,22 +231,33 @@ async def async_setup_platform(hass, config, add_devices, discovery_info=None):
         user_labels,
     )
     add_devices([device])
+    registered_devices.append(device)
 
-    await hass.async_add_executor_job(setup_hass_services, hass, device, android)
+    await hass.async_add_executor_job(setup_hass_services, hass, android)
 
 
-def setup_hass_services(hass, device, android):
+def setup_hass_services(hass, android):
     """Create the services for bravia TV."""
 
     async def async_send_command(call):
         """Send command to TV."""
         command_id = call.data.get(ATTR_COMMAND_ID)
-        await device.async_send_command(command_id)
+        entity_id = call.data.get(ATTR_ENTITY_ID)
+        device = lookup_registered_device(entity_id)
+        if device:
+            await device.async_send_command(command_id)
+        else:
+            _LOGGER.warning('No registered Bravia TV with entity_id: %s', entity_id)
 
     async def async_open_app(call):
         """Open app on TV."""
         uri = call.data.get(ATTR_URI)
-        await device.async_open_app(uri)
+        entity_id = call.data.get(ATTR_ENTITY_ID)
+        device = lookup_registered_device(entity_id)
+        if device:
+            await device.async_open_app(uri)
+        else:
+            _LOGGER.warning('No registered Bravia TV with entity_id: %s', entity_id)
 
     hass.services.register(
         DOMAIN,