A basic device

custom_components/browser_mod/media_player.py

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+import logging
+from homeassistant.components.media_player import MediaPlayerDevice
+
+from homeassistant.components.websocket_api import event_message
+
+from . import DOMAIN
+
+_LOGGER = logging.getLogger(__name__)
+
+async def async_setup_platform(hass, config, async_add_devices, discovery_info=None):
+    def adder(hass, deviceID, connection, cid):
+        player = BrowserModPlayer(hass, deviceID)
+        if connection:
+            player.connect(connection, cid)
+        _LOGGER.error(player)
+        return player
+    hass.data[DOMAIN]["adders"].append(adder)
+
+class BrowserModPlayer(MediaPlayerDevice):
+
+    def __init__(self, hass, deviceID, alias=None):
+        self.hass = hass
+        self.deviceID = deviceID
+        self.alias = alias
+        _LOGGER.error(f"Create player {deviceID}")
+
+    def connect(self, connection, cid):
+        self.cid = cid
+        self.connection = connection
+        _LOGGER.error(f"Connecting player {cid}")
+        connection.send_message(event_message(cid, {"command": "update"}))
+        pass
+
+    def update(self, browser, player):
+        _LOGGER.error(f"{self.deviceID}: {browser} {player}")
+        pass