// From https://randomnerdtutorials.com/esp32-mqtt-publish-subscribe-arduino-ide

#include <WiFi.h>
#include "PubSubClient.h"

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
int port = 1883;
String stMac;
char mac[50];
char clientId[50];

WiFiClient espClient;
PubSubClient client(espClient);

const int ledPin = 2;

void setup() {
  Serial.begin(115200);
  randomSeed(analogRead(0));

  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);

  wifiConnect();

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  Serial.println(WiFi.macAddress());
  stMac = WiFi.macAddress();
  stMac.replace(":", "_");
  Serial.println(stMac);
  
  client.setServer(mqttServer, port);
  // client.setCallback(callback);
  pinMode(ledPin, OUTPUT);
}

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

int packetCount = 0;
String appId = "c12ember";
String sensorId = "sglc0001";

void loop() {
  if (!client.connected()) {
    mqttReconnect();
  }

  packetCount++;

  char message[64];

  float errorRate = 0.2;
  int ran = random(0, 100);
  Serial.println(ran);
  Serial.println(errorRate*100);
  if (ran < errorRate*100) {
    sprintf(message, "brokenpacket_adsfasmasfa,asdas,fasdfas\nasdf");
  } else {
    sprintf(message, "%s,%d\n", sensorId, packetCount);
  }

  Serial.print(message);

  // client.publish("dteti/capstone-c12", message, true);
  client.publish("dteti-embersense-c12/sensor", message);

  client.loop();
  
  delay(1000);
}