import network
from umqtt.simple import MQTTClient
import time

SSID = "Wokwi-GUEST"
password = "" 
MQTT_Broker = "broker.hivemq.com"
Topic_pub = b"heartbeat"

def connect_wifi():
    wlan = network.WLAN(network.STA_IF)
    wlan.active(True)
    wlan.connect(SSID, password)

    while not wlan.isconnected():
        pass
    print("Connected:", wlan.ifconfig())

def main():
    connect_wifi()
    client = MQTTClient("wokwi-esp32", MQTT_Broker)
    client.connect()
    print("MQTT connected")

    last_heartbeat = time.ticks_ms()

    while True:
        if time.ticks_diff(time.ticks_ms(), last_heartbeat) > 10000:
            client.publish(Topic_pub, b"I'm tired!")
            print("Sent heartbeat")
            last_heartbeat = time.ticks_ms()
        time.sleep(0.1)

main()