import network
import time
from machine import Pin
import arduino
import ujson
from umqtt.simple import MQTTClient
# MQTT Server Parameters
MQTT_CLIENT_ID = "micropython-smartbin-demo"
MQTT_BROKER    = "broker.mqttdashboard.com"
MQTT_USER      = ""
MQTT_PASSWORD  = ""
MQTT_TOPIC     = "wokwi-smartbin"

sensor = SR04(trigPin,echoPin);
// HC-SR04 <------> EPS8266
const int trigPin = 9;
const int echoPin = 10;

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!")
message = prev_status
while True:
  print("Measuring bin level... ", end="")
  SR04.getDistance(distance)
  message = ujson.dumps({
    "level": sensor.getDistance();

  Serial.print("Measured distance: ");
  Serial.println(level);

  delay(100);
  
  })
  if message != prev_status:
    print("Updated!")
    print("Reporting to MQTT topic {}: {}".format(MQTT_TOPIC, message))
    client.publish(MQTT_TOPIC, message)
    prev_status = message
  else:
    print("No change")
  time.sleep(1)
  float  getDistance()
  {
    digitalWrite(trigpin, LOW);

delay(2);

digitalWrite(trigpin, HIGH);

delayMicroseconds(10);

digitalWrite(trigpin, LOW);

duration = pulseIn(echopin, HIGH);
distance = (duration / 2) / 29;
//Level = Speed of sound in air x Time delay / 2

  Serial.print("Distance in CM: ");
  Serial.println(distance/58);
return distance
  }