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"""Asyncio protocol implementation for handling telegrams over a RFXtrx connection ."""
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import asyncio
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from serial_asyncio import create_serial_connection
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from .protocol import DSMRProtocol, _create_dsmr_protocol
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def create_rfxtrx_dsmr_protocol(dsmr_version, telegram_callback, loop=None, encryption_key="", authentication_key="", **kwargs):
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"""Creates a RFXtrxDSMR asyncio protocol."""
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protocol = _create_dsmr_protocol(dsmr_version, telegram_callback,
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RFXtrxDSMRProtocol, loop, encryption_key, authentication_key,**kwargs)
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return protocol
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def create_rfxtrx_dsmr_reader(port, dsmr_version, telegram_callback, loop=None, encryption_key="", authentication_key=""):
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"""Creates a DSMR asyncio protocol coroutine using a RFXtrx serial port."""
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protocol, serial_settings = create_rfxtrx_dsmr_protocol(
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dsmr_version, telegram_callback, loop=None, encryption_key=encryption_key, authentication_key=authentication_key)
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serial_settings['url'] = port
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conn = create_serial_connection(loop, protocol, **serial_settings)
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return conn
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def create_rfxtrx_tcp_dsmr_reader(host, port, dsmr_version,
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telegram_callback, loop=None,
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keep_alive_interval=None):
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"""Creates a DSMR asyncio protocol coroutine using a RFXtrx TCP connection."""
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if not loop:
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loop = asyncio.get_event_loop()
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protocol, _ = create_rfxtrx_dsmr_protocol(
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dsmr_version, telegram_callback, loop=loop,
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keep_alive_interval=keep_alive_interval)
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conn = loop.create_connection(protocol, host, port)
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return conn
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PACKETTYPE_DSMR = 0x62
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SUBTYPE_P1 = 0x01
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class RFXtrxDSMRProtocol(DSMRProtocol):
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remaining_data = b''
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def data_received(self, data):
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"""Add incoming data to buffer."""
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data = self.remaining_data + data
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packetlength = data[0] + 1 if len(data) > 0 else 1
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while packetlength <= len(data):
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packettype = data[1]
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subtype = data[2]
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if (packettype == PACKETTYPE_DSMR and subtype == SUBTYPE_P1):
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dsmr_data = data[4:packetlength]
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super().data_received(dsmr_data)
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data = data[packetlength:]
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packetlength = data[0] + 1 if len(data) > 0 else 1
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self.remaining_data = data
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