"""
MicroPython IoT Weather Station Example for Wokwi.com

To view the data:

1. Go to http://www.hivemq.com/demos/websocket-client/
2. Click "Connect"
3. Under Subscriptions, click "Add New Topic Subscription"
4. In the Topic field, type "wokwi-weather" then click "Subscribe"

Now click on the DHT22 sensor in the simulation,
change the temperature/humidity, and you should see
the message appear on the MQTT Broker, in the "Messages" pane.

Copyright (C) 2022, Uri Shaked

https://wokwi.com/arduino/projects/322577683855704658
"""

import network
from machine import Timer
import time
from machine import Pin,I2C
import dht
import ujson
from umqtt.simple import MQTTClient
import ssd1306
import machine
import _thread



# ESP32 Pin assignment 
i2c = I2C(0, scl=Pin(22), sda=Pin(21))

oled_width = 128
oled_height = 64
oled = ssd1306.SSD1306_I2C(oled_width, oled_height, i2c)
     


# MQTT Server Parameters
MQTT_CLIENT_ID = "zhanglingman2206054024"
MQTT_BROKER    = "broker.emqx.io"
MQTT_USER      = ""
MQTT_PASSWORD  = ""
MQTT_TOPIC     = "zhanglingman2206054024"


TOPIC1 = b"ledctl2206054024"
TOPIC2 = b"pwmled2206054024"
TOPIC3 = b"ledstatus2206054024"


sensor = dht.DHT22(Pin(15))
led_red = machine.PWM(machine.Pin(2),freq=1000 )
led_red.duty(1023)


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!")

def sub_cb(topic,msg):
    global pwm_old,pwmval
    if topic == TOPIC1:
        print((topic, msg))
        if msg == b"on":
            pwmval = 0
            led_red.duty(pwmval)

        elif msg ==b"off":
            led_red.duty(1023)
            pwmval = 1023

    if topic == TOPIC2:
        pwmval = int(((100-int(msg)) / 100) * 1023)
        if pwmval>1023 : pwmval=1023
        if pwmval<0 : pwmval=0
        print((topic,pwmval))

print("Connecting to MQTT server... ", end="")
client = MQTTClient(MQTT_CLIENT_ID, MQTT_BROKER, user=MQTT_USER, password=MQTT_PASSWORD)
client.connect()
client.set_callback(sub_cb)
client.connect()
print("Connected!")
client.subscribe(TOPIC1)
client.subscribe(TOPIC2)

prev_weather = ""
def sample_weather(v):
    global prev_weather
    print("Measuring weather conditions... ", end="")
    sensor.measure() 
    msg_data={
        "temp": sensor.temperature(),
        "humidity": sensor.humidity(),
    }
    message = ujson.dumps(msg_data)
    if message != prev_weather:
        print("Updated!")
        print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC, message))
        #click.publish(MQTT_TOPIC,message)
        prev_weather = message
        oled.fill(0)
        oled.text("wangqian",10,10)
        oled.text("2206052029",10,20)
        oled.text("temp:%.1f dc"%(msg_data["temp"]),10,30)
        oled.text("humidity:%.1f v"%(msg_data["humidity"]),10,40)
        oled.show()
        client.publish(MQTT_TOPIC, message)
        prev_weather = message
    else:
        print("No change")
tim =Timer(-1)
tim.init(period=10000, mode=Timer.PERIODIC, callback=sample_weather)
while True:
  client.wait_msg()
  time.sleep(1)