Velbus split of entity in its own file (#79653)

* Velbus split of entity in its own file

* Update coveragerc

homeassistant/components/velbus/entity.py

@@ -0,0 +1,37 @@
+"""Support for Velbus devices."""
+from __future__ import annotations
+
+from velbusaio.channels import Channel as VelbusChannel
+
+from homeassistant.helpers.entity import DeviceInfo, Entity
+
+from .const import DOMAIN
+
+
+class VelbusEntity(Entity):
+    """Representation of a Velbus entity."""
+
+    _attr_should_poll: bool = False
+
+    def __init__(self, channel: VelbusChannel) -> None:
+        """Initialize a Velbus entity."""
+        self._channel = channel
+        self._attr_name = channel.get_name()
+        self._attr_device_info = DeviceInfo(
+            identifiers={
+                (DOMAIN, str(channel.get_module_address())),
+            },
+            manufacturer="Velleman",
+            model=channel.get_module_type_name(),
+            name=channel.get_full_name(),
+            sw_version=channel.get_module_sw_version(),
+        )
+        serial = channel.get_module_serial() or str(channel.get_module_address())
+        self._attr_unique_id = f"{serial}-{channel.get_channel_number()}"
+
+    async def async_added_to_hass(self) -> None:
+        """Add listener for state changes."""
+        self._channel.on_status_update(self._on_update)
+
+    async def _on_update(self) -> None:
+        self.async_write_ha_state()