Working version

__init__.py

@@ -0,0 +1,57 @@
+"""The Modbus RTU Monitor integration."""
+
+from __future__ import annotations
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import CONF_HOST, CONF_PORT, Platform
+from homeassistant.core import HomeAssistant
+
+from .coordinator import ModbusRTUMonitorCoordinator
+from .hub import ModbusRTUMonitorHub
+
+type ModbusRTUMonitorConfigEntry = ConfigEntry[ModbusRTUMonitorCoordinator]
+
+PLATFORMS: list[Platform] = [Platform.BINARY_SENSOR, Platform.CLIMATE, Platform.SENSOR]
+
+
+async def async_setup_entry(
+    hass: HomeAssistant, entry: ModbusRTUMonitorConfigEntry
+) -> bool:
+    """Set up Modbus RTU Monitor from a config entry."""
+    # Create hub
+    hub = ModbusRTUMonitorHub(
+        hass,
+        entry,
+        entry.data[CONF_HOST],
+        entry.data[CONF_PORT],
+    )
+
+    # Create coordinator
+    coordinator = ModbusRTUMonitorCoordinator(hass, entry, hub)
+    hub.coordinator = coordinator  # Link back to coordinator
+
+    # Setup hub (connect and start monitoring)
+    if not await hub.async_setup():
+        return False
+
+    # Store in runtime_data
+    entry.runtime_data = coordinator
+
+    # Forward to platforms
+    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
+
+    return True
+
+
+async def async_unload_entry(
+    hass: HomeAssistant, entry: ModbusRTUMonitorConfigEntry
+) -> bool:
+    """Unload a config entry."""
+    # Unload platforms
+    unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
+
+    if unload_ok:
+        # Close hub
+        await entry.runtime_data.hub.async_close()
+
+    return unload_ok