ESP32 ntfy.sh on GPIO

boot.py

# This script aims to monitor the state of a circuit (open or closed) using an ESP32 and send real-time notifications
# to an ntfy.sh topic whenever the circuit's state changes.
#
# The WiFi credentials, notification topic, and configurable parameters such as the minimum notification interval are
# defined at the beginning of the script for easy customization.
#
# It uses interrupts for efficient state detection and sends HTTP POST requests to ntfy.sh without relying on external
# libraries, making it lightweight and straightforward.
#
# DISCLAIMER: Highly written with the help of an LLM for the sake of my precious time, but works nicely for my needs.
#
# Author: Paul LAFFITTE <[email protected]>
# Date: December 2024 

import machine
from machine import Pin
from time import time, sleep
import network
import socket

# Variable for you to configure
ssid = "<SSID>"
password = "<PASSWORD>"
ntfy_topic = "<TOPIC>"
ntfy_host = "ntfy.sh"
ntfy_port = 80
notification_min_interval = 5

# Don't touch this one
last_notification_time = 0

def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(ssid, password)
    while not wlan.isconnected():
        pass
    print("connected to WiFi:", wlan.ifconfig())
    return wlan

def send_notification(message):
    print(message)
    
    if not wlan.isconnected():
        machine.reset()

    url = f"/{ntfy_topic}"
    content = message.encode('utf-8')
    
    # Create a socket and send HTTP POST
    addr = socket.getaddrinfo(ntfy_host, ntfy_port)[0][-1]
    s = socket.socket()
    s.connect(addr)
    s.sendall(b"POST " + url.encode() + b" HTTP/1.1\r\n" +
              b"Host: " + ntfy_host.encode() + b"\r\n" +
              b"Content-Type: text/plain\r\n" +
              b"Content-Length: " + str(len(content)).encode() + b"\r\n" +
              b"\r\n" +
              content)
    response = s.recv(1024)
    print(response.decode())
    s.close()

def callback(pin):
    global last_notification_time
    current_time = time()
    
    if current_time - last_notification_time >= notification_min_interval:
        print(current_time, last_notification_time, current_time - last_notification_time)
        state = "closed" if pin.value() == 0 else "open"
        send_notification("change: " + state)
        last_notification_time = current_time

print("connecting...")
wlan = connect_wifi()

pin = Pin(21, Pin.IN, Pin.PULL_UP)
pin.irq(trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING, handler=callback)

while True:
    print("sleep 10")
    sleep(10)