"""
Simple socket server used to reverse engineer the messaging protocol the bundled software uses to send data to the
LED sign.

The server just dumps incoming messages in a hexdump-like format as well as an easy to read Python bytestring.
"""


import asyncio
import string


async def handle_client(reader, writer):
    message = await reader.read(255)

    hex_chars = [hex(j)[2:].zfill(2) for j in message]

    ascii_chars = []
    for j in message:
        char = chr(j)
        if char in (string.ascii_letters + string.digits + string.punctuation):
            ascii_chars.append(char)
        else:
            ascii_chars.append(".")

    print("Message received: ", end="")
    print(" ".join(hex_chars), end=" | ")
    print("".join(ascii_chars), end=" | ")
    print("".join(repr(message)))

    writer.close()


async def run_server():
    server = await asyncio.start_server(handle_client, '', 3000)
    async with server:
        await server.serve_forever()


if __name__ == "__main__":
    asyncio.run(run_server())