88 lines
2.8 KiB
Python
88 lines
2.8 KiB
Python
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"""Representation of an EnOcean dongle."""
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import glob
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import logging
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from os.path import basename, normpath
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from enocean.communicators import SerialCommunicator
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from enocean.protocol.packet import RadioPacket
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import serial
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from homeassistant.helpers.dispatcher import async_dispatcher_connect
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from .const import SIGNAL_RECEIVE_MESSAGE, SIGNAL_SEND_MESSAGE
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_LOGGER = logging.getLogger(__name__)
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class EnOceanDongle:
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"""Representation of an EnOcean dongle.
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The dongle is responsible for receiving the ENOcean frames,
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creating devices if needed, and dispatching messages to platforms.
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"""
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def __init__(self, hass, serial_path):
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"""Initialize the EnOcean dongle."""
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self._communicator = SerialCommunicator(
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port=serial_path, callback=self.callback
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)
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self.serial_path = serial_path
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self.identifier = basename(normpath(serial_path))
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self.hass = hass
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self.dispatcher_disconnect_handle = None
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async def async_setup(self):
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"""Finish the setup of the bridge and supported platforms."""
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self._communicator.start()
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self.dispatcher_disconnect_handle = async_dispatcher_connect(
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self.hass, SIGNAL_SEND_MESSAGE, self._send_message_callback
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)
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def unload(self):
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"""Disconnect callbacks established at init time."""
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if self.dispatcher_disconnect_handle:
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self.dispatcher_disconnect_handle()
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self.dispatcher_disconnect_handle = None
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def _send_message_callback(self, command):
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"""Send a command through the EnOcean dongle."""
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self._communicator.send(command)
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def callback(self, packet):
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"""Handle EnOcean device's callback.
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This is the callback function called by python-enocan whenever there
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is an incoming packet.
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"""
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if isinstance(packet, RadioPacket):
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_LOGGER.debug("Received radio packet: %s", packet)
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self.hass.helpers.dispatcher.dispatcher_send(SIGNAL_RECEIVE_MESSAGE, packet)
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def detect():
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"""Return a list of candidate paths for USB ENOcean dongles.
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This method is currently a bit simplistic, it may need to be
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improved to support more configurations and OS.
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"""
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globs_to_test = ["/dev/tty*FTOA2PV*", "/dev/serial/by-id/*EnOcean*"]
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found_paths = []
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for current_glob in globs_to_test:
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found_paths.extend(glob.glob(current_glob))
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return found_paths
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def validate_path(path: str):
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"""Return True if the provided path points to a valid serial port, False otherwise."""
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try:
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# Creating the serial communicator will raise an exception
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# if it cannot connect
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SerialCommunicator(port=path)
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return True
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except serial.SerialException as exception:
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_LOGGER.warning("Dongle path %s is invalid: %s", path, str(exception))
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return False
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