language yada yada

ant1.ant

// Blink LED
2 = pin     // pin = 2
0 = on      // on = 0
pin 2 G     // gpio.mode(pin, OUTPUT)
1000 { !on = on pin on W } T

'mqtt://broker.hivemq.com:1883' M = c
c 'elk/rx' {
  'topic' $1 'message' $2 '{%Q:%Q, %Q:%Q}' c P  // mqtt.publish
} S                                             // mqtt.subscribe(c, topic, func)

firmware.js

// Blink LED
let led = { pin: 2, on: false };  // LED state
gpio.mode(led.pin, 2);            // Set LED pin to output mode
setTimeout(function() { led.on = !led.on; gpio.write(led.pin, led.on); }, 1000);

// Report some data to MQTT
let conn = mqtt.connect('mqtt://broker.hivemq.com:1883');   // Create MQTT connection
mqtt.subscribe(conn, 'elk/rx', function(topic, message) {   // Subscribe to 'elk/rx' topic
  log('MQTT: ' + topic + ' -> ' + message);
  let response = {ram: ram(), usage: usage(), received: message};
  mqtt.publish(conn, 'elk/tx', str(response));
});