relay.py

import sys
import socket

TCP_IP = 'ESP_IP'
TCP_PORT = 8080

open_relay = bytes.fromhex('A0 01 00 A1')
close_relay = bytes.fromhex('A0 01 01 A2')

s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((TCP_IP, TCP_PORT))

argv = sys.argv[1:]

if 'open' in argv:
    s.send(open_relay)
else:
    s.send(close_relay)

s.close()