import network
import time
from machine import Pin
import dht
import ujson
from umqtt.simple import MQTTClient
#MQTT Server parametrs
MQTT_CLIENT_ID="clientId-GQchMEBLxH"
MQTT_BROKER="mqtt-dashboard.com"
MQTT_USER="    "
MQTT_PASSWORD="    "
MQTT_TOPIC="wokwi-weather"
sensor=dht.DHT22(Pin(15))
print("connecting to WiFi",end="    ")
sta_if=network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect('Wokwi-GUEST',"")
while not sta_if.isconnected():
    print(".",end="")
    time.sleep(0.1)
    print("Connected!")
    print("Connecting to MQTT server...",end="")
client=MQTTClient(MQTT_CLIENT_ID,MQTT_BROKER,
user=MQTT_USER,password=MQTT_PASSWORD)
client.connect()
print("connected!")
prev_weather=""
while True:
    print("Measuring weather conditions...",end="")
    sensor.measure()
    message=ujson.dumps({"temp":
    sensor.temperature(),
    "humidity":sensor.humidity(),
    })
if message!=prev_weather:
    print("Updated!")
    print("Reporting to MQTT topic{}:{}".format(MQTT_TOPIC,message))
    client.publish(MQTT_TOPIC,message)
    prev_weather=message
else:
    print("No change")
time.sleep(1)