Tech Gyan Set
Published © MIT

ESP32 4G LTE GPS Tracker with MQTT Dashboard

A SIM-based ESP32 4G LTE GPS tracker that sends real-time vehicle location via MQTT to a live web dashboard.

BeginnerFull instructions provided8 hours334
ESP32 4G LTE GPS Tracker with MQTT Dashboard

Things used in this project

Software apps and online services

Arduino IDE
Arduino IDE

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Code

🚗 ESP32 4G LTE GPS Tracker (Complete Firmware)

C/C++
#define TINY_GSM_MODEM_SIM7600
#define TINY_GSM_RX_BUFFER 1024

#include <TinyGsmClient.h>
#include <PubSubClient.h>
#include <TinyGPSPlus.h>

// ================= PIN DEFINITIONS =================
#define MODEM_RX 16
#define MODEM_TX 17

#define GPS_RX 27
#define GPS_TX 14

// ================= NETWORK CONFIG =================
const char apn[]  = "airtelgprs.com";
const char user[] = "";
const char pass[] = "";

const char* broker = "broker.emqx.io";
const int   port   = 1883;
const char* topic  = "device/SL001/gps";

// ================= OBJECTS =================
HardwareSerial SerialAT(2);
HardwareSerial gpsSerial(1);

TinyGsm modem(SerialAT);
TinyGsmClient gsmClient(modem);
PubSubClient mqtt(gsmClient);
TinyGPSPlus gps;

unsigned long lastPublish = 0;

// ================= CONNECT GPRS =================
bool connectGPRS() {
  Serial.println("Connecting to Network...");
  if (!modem.waitForNetwork()) {
    Serial.println("Network Failed");
    return false;
  }

  Serial.println("Connecting to GPRS...");
  if (!modem.gprsConnect(apn, user, pass)) {
    Serial.println("GPRS Failed");
    return false;
  }

  Serial.println("GPRS Connected");
  return true;
}

// ================= CONNECT MQTT =================
bool connectMQTT() {
  String clientID = "ESP32_" + String(random(10000));
  if (mqtt.connect(clientID.c_str())) {
    Serial.println("MQTT Connected");
    return true;
  }

  Serial.println("MQTT Failed");
  return false;
}

// ================= SETUP =================
void setup() {

  Serial.begin(115200);

  SerialAT.begin(115200, SERIAL_8N1, MODEM_RX, MODEM_TX);
  gpsSerial.begin(9600, SERIAL_8N1, GPS_RX, GPS_TX);

  modem.restart();

  if (!connectGPRS()) {
    Serial.println("GPRS Connection Error");
  }

  mqtt.setServer(broker, port);

  if (!connectMQTT()) {
    Serial.println("MQTT Connection Error");
  }

  Serial.println("SYSTEM READY");
}

// ================= LOOP =================
void loop() {

  // Read GPS Data
  while (gpsSerial.available()) {
    gps.encode(gpsSerial.read());
  }

  // Reconnect MQTT if disconnected
  if (!mqtt.connected()) {
    connectGPRS();
    connectMQTT();
  }

  mqtt.loop();

  // Publish GPS Data Every 5 Seconds
  if (gps.location.isValid() && millis() - lastPublish > 5000) {

    float lat = gps.location.lat();
    float lng = gps.location.lng();
    float speed = gps.speed.kmph();
    float altitude = gps.altitude.meters();
    float course = gps.course.deg();
    int sat = gps.satellites.value();

    String payload = "{";
    payload += "\"lat\":" + String(lat, 6) + ",";
    payload += "\"lng\":" + String(lng, 6) + ",";
    payload += "\"speed\":" + String(speed, 1) + ",";
    payload += "\"sat\":" + String(sat) + ",";
    payload += "\"altitude\":" + String(altitude, 1) + ",";
    payload += "\"direction\":" + String(course, 1);
    payload += "}";

    mqtt.publish(topic, payload.c_str());

    Serial.println("Published Data:");
    Serial.println(payload);

    lastPublish = millis();
  }
}

Credits

Tech Gyan Set
32 projects • 14 followers
Tech Gyan Set | IoT & Embedded Systems Creator | Arduino, ESP32, GSM & NodeMCU Projects | Smart Home & Real-Life Automation Tutorials
Thanks to Tech Gyan Set .

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