import network
import time
from machine import Pin
import dht
import ujson
from umqtt.simple import MQTTClient
from machine import I2C, Pin 
from i2c_lcd import I2cLcd 

"""
Author: Oussama Mater
"""

# MQTT Server Parameters
MQTT_CLIENT_ID = "micropython-weather-demo"
MQTT_BROKER    = "broker.mqttdashboard.com"
MQTT_TOPIC     = "esp32-weather-station-2023"
MQTT_USER      = ""
MQTT_PASSWORD  = ""

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!")

# LCD Helper
# Default Address, https://microcontrollerslab.com/i2c-lcd-esp32-esp8266-micropython-tutoria
AddressOfLcd = 0x27
i2c = I2C(scl=Pin(22), sda=Pin(21), freq=400000)
lcd = I2cLcd(i2c, AddressOfLcd, 2, 16)

def displayToLCD(upperText, lowerText):
    lcd.move_to(0, 0)
    lcd.putstr("Temp in C = " + str(upperText))
    lcd.move_to(0, 1)
    lcd.putstr("Humidity = " + str(lowerText))

# DHT 
sensor = dht.DHT22(Pin(15))

prev_weather = ""
while True:
  sensor.measure() 

  displayToLCD(sensor.temperature(), sensor.humidity())

  payload = ujson.dumps({
    "temp": sensor.temperature(),
    "humidity": sensor.humidity(),
  })

  if payload != prev_weather:
    client.publish(MQTT_TOPIC, payload)
    prev_weather = payload
  else:
    print("No change, won't publish")
  
  time.sleep(1)