mindstorms ev3 remote control with keyboard by using mqtt, watch this! https://youtu.be/kl_07BWGNWo

remote_ctl_pub.py

#!/usr/bin/env python3

import paho.mqtt.client as mqtt
from pynput.keyboard import Key, Listener

client = mqtt.Client()
client.connect("localhost",1883,60)

def on_press(key):
    print("{} is pressed".format(key))
    if key == Key.up:
        client.publish("topic/motor/dt", str(-50) + "," + str(-50))
    elif key == Key.down:
        client.publish("topic/motor/dt", str(50) + "," + str(50))
    elif key == Key.right:
        client.publish("topic/motor/dt", str(-50) + "," + str(0))
    elif key == Key.left:
        client.publish("topic/motor/dt", str(0) + "," + str(-50))

def on_release(key):
    print('{0} released'.format(key))
    client.publish("topic/motor/dt", str(0) + "," + str(0))
    if key == Key.esc:
        client.disconnect();
        return False

with Listener(
    on_press = on_press,
    on_release= on_release
) as listener:
    listener.join()

remote_ctl_sub.py

    # !/usr/bin/env python3

import paho.mqtt.client as mqtt
from ev3dev.auto import *

ma = Motor(OUTPUT_A)
md = Motor(OUTPUT_D)

def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    client.subscribe("topic/motor/dt")


def on_message(client, userdata, msg):
    msg_str = msg.payload.decode("utf-8")
    msg_array = msg_str.split(",")
    ma.duty_cycle_sp = msg_array[0]
    md.duty_cycle_sp = msg_array[1]

client = mqtt.Client()
client.connect("192.168.3.4" ,1883 ,60)

client.on_connect = on_connect
client.on_message = on_message

ma.run_direct()
md.run_direct()
ma.duty_cycle_sp = 0
md.duty_cycle_sp = 0

client.loop_forever()