import network
import time
from umqtt.simple import MQTTClient

name='Wokwi-GUEST'
passw=""
topic_pub='esp/pub'
topic_sub='esp/sub'

def wifi_connection():      # wifi function
    wlan=network.WLAN(network.STA_IF)    #1 scan
    wlan.active(True)                    
    wlan.connect(name , passw)
    print('connecting to Wokwi-GUEST.....')
    while not wlan.isconnected():
        pass
    print ('connected')    

def esp(topic,data):      # sub function هستقبل عليها
    print("esp is calling")
    if data == b'name' :
        print('iam esp')
    elif data == b'greeting':
        print('hello')    


def broker():            
    wifi_connection()
    client = MQTTClient("seif1","mqtt-dashboard.com") #hanshake
    client.set_callback(esp) # the function which sub the data
    client.connect() # connect
    print('connect to broker')
    client.subscribe(topic_sub)
    while True:
        client.check_msg()
        client.publish(topic_pub,'is there anybody out there')
        time.sleep(2)

broker()