esp32 micropython aler button example

SSID, PASSWORD = 'ssid', 'pass'
PRESS_TTL = 0.01

ALERT_ENDPOINT = 'https://ya.ru/foo/bar/baz/ni'
DEVICE_ID = 'some_dummy_device_id'
HASH_SALT = '$y$j9T$edgJeH8xqTYX6/NTUBML70$oq6bfszMECZZCib5ADrj8BkAxsWtw1Nd54L.gE2OXE5'

def network_config(ssid, password):
    """ setup wifi connection """
    import network

    sta_if = network.WLAN(network.STA_IF)
    if not sta_if.isconnected():
        print('connecting to network...')
        sta_if.active(True)
        sta_if.connect(ssid, password)
        while not sta_if.isconnected():
            pass
    print('network config:', sta_if.ifconfig())

def get_secret():
    """ generate secret for request """

    from datetime import datetime
    from hashlib import sha256

    raw_secret = ''.join((
        DEVICE_ID, HASH_SALT, datetime.now().minute
    ))

    return sha256(_)

def post_alert():
    """ post http request to alert server """
    import urequests as requests

    r = requests.post(ALERT_ENDPOINT, json={
        'device_id': DEVICE_ID,
        'secret': get_secret(),
    })


def monitor_emerg_button(buutton):
    """ monitor targer button"""
    first = button.value()
    time.sleep(PRESS_TTL)
    second = button value()

    status_pressed = first and not second
    status_released = not first and second

    if status_pressed:
        post_alert()

def main():
    """ app entry point """
    import machine

    network_config(SSID, PASSWORD)

    button = machine.Pin(12, machine.Pin.IN, machine.Pin.PULL_UP)

    while True:
        monitor_emerg_button(button)

main()