Monitor a raspberry pi motion sensor via mqtt

motion.py

#!/usr/bin/env python3

import RPi.GPIO as GPIO
import time
import os
import sys
import threading

import paho.mqtt.publish as publish

GPIO.setmode(GPIO.BCM)
motion_pin = 15
led_pin = 16

GPIO.setup(motion_pin, GPIO.IN)
GPIO.setup(led_pin, GPIO.OUT)

lastMotion = 0

while True:
    motion = GPIO.input(motion_pin)
    if motion != lastMotion:
        publish.single('env1/motion', "{\"motion\": %d}" % lastMotion, hostname='mqtt.sample.com', port=1883, client_id='pi0')
        publish.single('env1/motion', "{\"motion\": %d}" % motion, hostname='mqtt.sample.com', port=1883, client_id='pi0')
        GPIO.output(led_pin, motion)
    lastMotion = motion
    time.sleep(0.1)