import aioesphomeapi
import asyncio

async def main():
    """Connect to an ESPHome device and get details."""

    # Establish connection
    api = aioesphomeapi.APIClient("api_test.local", 6053, "MyPassword")
    await api.connect(login=True)

    # Get API version of the device's firmware
    print(api.api_version)

    # Show device details
    device_info = await api.device_info()
    print(device_info)

    # List all entities of the device
    entities = await api.list_entities_services()
    print(entities)

 loop = asyncio.get_event_loop()
 loop.run_until_complete(main())

import aioesphomeapi
import asyncio

async def main():
    """Connect to an ESPHome device and wait for state changes."""
    cli = aioesphomeapi.APIClient("api_test.local", 6053, "MyPassword")

    await cli.connect(login=True)

    def change_callback(state):
        """Print the state changes of the device.."""
        print(state)

    # Subscribe to the state changes
    await cli.subscribe_states(change_callback)

loop = asyncio.get_event_loop()
try:
    asyncio.ensure_future(main())
    loop.run_forever()
except KeyboardInterrupt:
    pass
finally:
    loop.close()