Reading one number from a PRG320

prg320.py

import asyncio
import binascii
import json

import serial_asyncio

class Prg320Output(asyncio.Protocol):
    """Get the output of PRG320."""

    def connection_made(self, transport):
        """Initialize the connection."""
        self.transport = transport

    def data_received(self, data):
        """Get one random number."""
        output = {
            'raw': str(repr(data)),
            'hex': str(binascii.hexlify(bytearray(data))),
            'int': int(bytearray(data).hex(), 16),
        }
        print(json.dumps(output, sort_keys=True, indent=2))
        if b'\n' in data:
            self.transport.close()

    def connection_lost(self, exc):
        """Close the connection."""
        self.transport.loop.stop()

loop = asyncio.get_event_loop()
coro = serial_asyncio.create_serial_connection(
    loop, Prg320Output, '/dev/ttyUSB0', baudrate=921600)
loop.run_until_complete(coro)
loop.run_forever()
loop.close()