PiDoorbell/main.py

import rp2
import network
import ubinascii
import machine
import uos
from machine import Pin
from time import sleep
import urequests as requests
import time
import micropython_ota
from secrets import secrets
from settings import settings

# Set country to avoid possible errors
rp2.country('HU')

# Define blinking function for onboard LED to indicate error codes    
def blink_onboard_led(num_blinks):
    led = machine.Pin('LED', machine.Pin.OUT)
    for i in range(num_blinks):
        led.value(1)
        time.sleep_ms(200)
        led.value(0)
        time.sleep_ms(200)

def connect_wifi():     
    wlan.active(True)
    # If you need to disable powersaving mode
    # wlan.config(pm = 0xa11140)

    # See the MAC address in the wireless chip OTP
    mac = ubinascii.hexlify(wlan.config('mac'),':').decode()
    print('mac = ' + mac)

    # Other things to query
    # print(wlan.config('channel'))
    # print(wlan.config('essid'))
    # print(wlan.config('txpower'))

    # Load login data from different file for safety reasons
    pw = secrets['pw']

    wlan.connect(ssid, pw)

    # Wait for connection with 10 second timeout
    timeout = 20
    while timeout > 0:
        if wlan.status() < 0 or wlan.status() >= 3:
            break
        timeout -= 1
        print('Waiting for connection...')
        blink_onboard_led(2)
        time.sleep(1)   
    # Handle connection error
    # Error meanings
    # 0  Link Down
    # 1  Link Join
    # 2  Link NoIp
    # 3  Link Up
    # -1 Link Fail
    # -2 Link NoNet
    # -3 Link BadAuth

    wlan_status = wlan.status()
    blink_onboard_led(wlan_status)

    if wlan_status != 3:
        blink_onboard_led(5)
        raise RuntimeError('Wi-Fi connection failed')
    else:
        blink_onboard_led(1)
        print('Connected')
        status = wlan.ifconfig()
        print('ip = ' + status[0])

def disconnect_wifi():
    wlan.disconnect()
    wlan.active(False)
    wlan.deinit()
    print('Disconnected')

def send_notification(title, tags):
    try:
        send_notification_to_server('https://ntfy.sh/' + ntfy_topic, title, tags)
    except:
        print('Error sending notification')
        blink_onboard_led(3)
        send_notification_to_server('https://ntfy.adix.link/' + ntfy_topic, title, tags)

def send_notification_to_server(notify_url, title, tags):
    print('Sending notification to ' + notify_url + '...')
    # Send notification
    request = requests.post(notify_url, data="Csengo", headers={
        'Title': title, 
        'Priority': '5', 
        'X-Tags': tags
    })
    print(request.content)
    request.close()

def set_cpu_to_high_freq():
    machine.freq(125000000)

def set_cpu_to_low_freq():
    machine.freq(20000000)
    pass


set_cpu_to_high_freq()

ota_branch = settings['ota_branch']
ota_soft_reset_device=False

ntfy_topic = settings['ntfy_topic']

print('Starting up...')

wlan = network.WLAN(network.STA_IF)
ssid = secrets['ssid']

print('WiFi network to use on action: ' + ssid)

current_version = 'unknown'
if 'version' in uos.listdir():
    with open('version', 'r') as current_version_file:
        current_version = current_version_file.readline().strip()
    
door_bell = machine.Pin(28, machine.Pin.IN, machine.Pin.PULL_DOWN)
debug_mode = machine.Pin(15, machine.Pin.IN, machine.Pin.PULL_DOWN)

doorbell_last_state = False
doorbell_current_state = False

debug_last_state = False
debug_current_state = False

led = Pin('LED', Pin.OUT)
blink_onboard_led(2)
sleep(1)
try:
    connect_wifi()
    print("Checking version updates...")
    #micropython_ota.reset_version()
    micropython_ota.ota_update('https://iot-sw.adix.link', 'doorbell', ota_branch)
    send_notification(title = 'Started (sw: ' + current_version + ')', tags = 'signal_strength')
    sleep(2)
    disconnect_wifi()
    blink_onboard_led(1)
except Exception as e:
    print('Error: Could not send became-online message :(')
    print(e)
    blink_onboard_led(4)

print('Changing frequency and beginning loop...')
set_cpu_to_low_freq()
while True:
    doorbell_current_state = door_bell.value()
    debug_current_state = debug_mode.value()

    if debug_last_state == False and debug_current_state == True:
        set_cpu_to_high_freq()
        print('Frequency is set to default')
        blink_onboard_led(5)

    debug_last_state = debug_current_state
    
    if doorbell_last_state == False and doorbell_current_state == True:
        set_cpu_to_high_freq()
        led.value(1)
        print('Connecting to WiFi ' + ssid + '...')
        connect_wifi()
        print('Sending notification...')
        
        send_notification(title = 'Dany Csengo', tags = 'bell')
        
        time.sleep(1)
        version_changed, remote_version = micropython_ota.check_version('https://iot-sw.adix.link', 'doorbell', ota_branch)
        if version_changed:
            send_notification(title = 'Updating to ' + remote_version, tags = 'new')
            if ota_soft_reset_device:
                print(f'Found new version {remote_version}, soft-resetting device...')
                machine.soft_reset()
            else:
                print(f'Found new version {remote_version}, hard-resetting device...')
                machine.reset()
        else:
            print('No new version available')
        
        disconnect_wifi()
        
        led.value(0)
        time.sleep_ms(200)
        blink_onboard_led(1)
        # Sleep for 5 sec to avoid multiple triggers AND too frequent frequency change
        print('Waiting 5 seconds before changing frequency...')
        time.sleep(5)
        set_cpu_to_low_freq()
    
    doorbell_last_state = doorbell_current_state
    time.sleep_ms(200)