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import serial
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import asyncio
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import serial_asyncio
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from dsmr_parser.parsers import TelegramParser, TelegramParserV2_2
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SERIAL_SETTINGS_V2_2 = {
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'baudrate': 9600,
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'bytesize': serial.SEVENBITS,
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'parity': serial.PARITY_NONE,
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'stopbits': serial.STOPBITS_ONE,
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'xonxoff': 0,
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'rtscts': 0,
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'timeout': 20
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}
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SERIAL_SETTINGS_V2_2_EVEN = {
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'baudrate': 9600,
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'bytesize': serial.SEVENBITS,
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'parity': serial.PARITY_EVEN,
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'stopbits': serial.STOPBITS_ONE,
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'xonxoff': 0,
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'rtscts': 0,
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'timeout': 20
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}
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SERIAL_SETTINGS_V4 = {
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'baudrate': 115200,
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'bytesize': serial.SEVENBITS,
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'parity': serial.PARITY_NONE,
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'stopbits': serial.STOPBITS_ONE,
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'xonxoff': 0,
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'rtscts': 0,
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'timeout': 20
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}
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SERIAL_SETTINGS_V4_EVEN = {
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'baudrate': 115200,
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'bytesize': serial.SEVENBITS,
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'parity': serial.PARITY_EVEN,
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'stopbits': serial.STOPBITS_ONE,
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'xonxoff': 0,
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'rtscts': 0,
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'timeout': 20
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}
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def is_start_of_telegram(line):
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return line.startswith('/')
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def is_end_of_telegram(line):
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return line.startswith('!')
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class SerialReader(object):
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PORT_KEY = 'port'
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def __init__(self, device, serial_settings, telegram_specification):
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self.serial_settings = serial_settings
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self.serial_settings[self.PORT_KEY] = device
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if serial_settings is SERIAL_SETTINGS_V2_2:
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telegram_parser = TelegramParserV2_2
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else:
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telegram_parser = TelegramParser
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self.telegram_parser = telegram_parser(telegram_specification)
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def read(self):
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"""
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Read complete DSMR telegram's from the serial interface and parse it
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into CosemObject's and MbusObject's
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:rtype dict
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"""
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with serial.Serial(**self.serial_settings) as serial_handle:
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telegram = []
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while True:
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line = serial_handle.readline()
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line = line.decode('ascii')
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# Telegrams need to be complete because the values belong to a
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# particular reading and can also be related to eachother.
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if not telegram and not is_start_of_telegram(line):
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continue
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telegram.append(line)
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if is_end_of_telegram(line):
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yield self.telegram_parser.parse(telegram)
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telegram = []
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class AsyncSerialReader(SerialReader):
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"""Serial reader using asyncio pyserial."""
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PORT_KEY = 'url'
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@asyncio.coroutine
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def read(self, queue):
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"""
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Read complete DSMR telegram's from the serial interface and parse it
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into CosemObject's and MbusObject's.
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Instead of being a generator, values are pushed to provided queue for
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asynchronous processing.
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:rtype Generator/Async
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"""
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# create Serial StreamReader
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conn = serial_asyncio.open_serial_connection(**self.serial_settings)
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reader, _ = yield from conn
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telegram = []
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while True:
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# read line if available or give control back to loop until
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# new data has arrived
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line = yield from reader.readline()
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line = line.decode('ascii')
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# Telegrams need to be complete because the values belong to a
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# particular reading and can also be related to eachother.
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if not telegram and not is_start_of_telegram(line):
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continue
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telegram.append(line)
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if is_end_of_telegram(line):
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# push new parsed telegram onto queue
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queue.put_nowait(self.telegram_parser.parse(telegram))
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telegram = []
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