After you've completed the above steps, use the Arduino IDE to compile the script and upload it to your M5Stamp.

#include <QubitroMqttClient.h>
#include <WiFi.h>
// WiFi Client
WiFiClient wifiClient;
// Qubitro Client
QubitroMqttClient mqttClient(wifiClient);
// Device Parameters
char deviceID[] = "62f53d7f-6f53-474a-897f-24c808629df9";
char deviceToken[] = "ardE7DqQFct2j3SrO2ApKbii1Dx6NkNx8EClSgKT";
// WiFi Parameters
const char* ssid = "ELDRADO";
const char* password = "amazon123";
int ledPin = 18; // choose pin for the LED/BUZ
int inputPin = 26; // choose input pin (for Infrared sensor)
int val = 0; // variable for reading the pin status
void setup() {
pinMode(ledPin, OUTPUT); // declare LED as output
pinMode(inputPin, INPUT); // declare Infrared sensor as input
// Initialize the serial port
serial_init();
// Initialize wireless connectivity
wifi_init();
// Initialize Qubitro
qubitro_init();
}
void loop() {
val = digitalRead(inputPin); // read input value
if (val == HIGH)
{ // check if the input is HIGH
digitalWrite(ledPin, LOW); // turn LED OFF
String Status = "Open";
int Rate = 100;
// Send telemetry
String payload = "{\"status\": \"" + Status + "\", \"Rate\": " + String(Rate) + "}";
mqttClient.poll();
mqttClient.beginMessage(deviceID);
mqttClient.print(payload);
mqttClient.endMessage();
Serial.println(payload);
}
else
{
digitalWrite(ledPin, HIGH); // turn LED ON
String Status = "Close";
int Rate = 0;
// Send telemetry
String payload = "{\"status\": \"" + Status + "\", \"Rate\": " + String(Rate) + "}";
mqttClient.poll();
mqttClient.beginMessage(deviceID);
mqttClient.print(payload);
mqttClient.endMessage();
Serial.println(payload);
}
delay(2000);
}
// Initialization code
void serial_init() {
// Initiate serial port connection
Serial.begin(115200);
// Delay for stabilization
delay(200);
}
void wifi_init() {
// Set WiFi mode
WiFi.mode(WIFI_STA);
// Disconnect WiFi
WiFi.disconnect();
delay(100);
// Initiate WiFi connection
WiFi.begin(ssid, password);
// Print connectivity status to the terminal
Serial.print("Connecting to WiFi...");
while (true)
{
delay(1000);
Serial.print(".");
if (WiFi.status() == WL_CONNECTED)
{
Serial.println("");
Serial.println("WiFi Connected.");
Serial.print("Local IP: ");
Serial.println(WiFi.localIP());
Serial.print("RSSI: ");
Serial.println(WiFi.RSSI());
break;
}
}
}
void qubitro_init() {
char host[] = "broker.qubitro.com";
int port = 1883;
mqttClient.setId(deviceID);
mqttClient.setDeviceIdToken(deviceID, deviceToken);
Serial.println("Connecting to Qubitro...");
if (!mqttClient.connect(host, port))
{
Serial.print("Connection failed. Error code: ");
Serial.println(mqttClient.connectError());
Serial.println("Visit docs.qubitro.com or create a new issue on github.com/qubitro");
}
Serial.println("Connected to Qubitro.");
mqttClient.subscribe(deviceID);
}

Check the serial monitor results after you've uploaded the script.