Antratek ETH8020 python relay control script

eth2080.py

import socket
import struct

class eth8020:
    def __init__(self, hostname, port=17494):
        self.s = socket.create_connection((hostname, int(port)))

    def execute(self, request):
        self.s.send(request)
        response = self.s.recv(10)
        return struct.unpack('B', response)[0]

    def set(self, index, value):
        if value:
            return self.activate(index)
        return self.deactivate(index)

    def activate(self, index, duration=0):
        request = struct.pack('BBB', 0x20, index, duration)
        return self.execute(request)

    def deactivate(self, index, duration=0):
        request = struct.pack('BBB', 0x21, index, duration)
        return self.execute(request)

if __name__ == '__main__':
    import argparse, sys
    p = argparse.ArgumentParser(description="Command-line utility for controlling the Antratek ETH8020.")
    p.add_argument('ip_address')
    p.add_argument('relay', type=int, help="relay index 1..20")
    p.add_argument('action', type=int, help="1=activate, 0=deactivate.")
    p.add_argument('-q', dest='quiet', action='store_true', help="Do not print to stdout.")
    args = p.parse_args()

    try:
        e = eth8020(args.ip_address)
        r = e.set(args.relay, args.action)
    except Exception as error:
        print(error)
        sys.exit(-1)

    if not args.quiet:
        print('success' if not r else 'failed')
    sys.exit(r)