fastclockClient/fs/init.js

load('api_config.js');
load('api_gpio.js');
load('api_mqtt.js');
load('api_sys.js');
load('api_timer.js');
load('api_arduino_ssd1306.js');

// Helper C function get_led_gpio_pin() in src/main.c returns built-in LED GPIO
let led = ffi('int get_led_gpio_pin()')();

let getInfo = function() {
  return JSON.stringify({total_ram: Sys.total_ram(), free_ram: Sys.free_ram()});
};
let i = 0;

// Initialize Adafruit_SSD1306 library (I2C)
let d = Adafruit_SSD1306.create_i2c(4 /* RST GPIO */, Adafruit_SSD1306.RES_128_64);
// Initialize the display.
d.begin(Adafruit_SSD1306.SWITCHCAPVCC, 0x3D, true /* reset */);
d.display();

let showStr = function(d, str) {
  d.clearDisplay();
  d.setTextSize(2);
  d.setTextColor(Adafruit_SSD1306.WHITE);
  d.setCursor(d.width() / 4, d.height() / 4);
  d.write(str);
  d.display();
};

Timer.set(1000 /* milliseconds */, true /* repeat */, function() {
  showStr(d, "i = " + JSON.stringify(i));
  print("i = ", i);
  i++;
}, null);

// Blink built-in LED every second
GPIO.set_mode(led, GPIO.MODE_OUTPUT);
Timer.set(1000 /* 1 sec */, true /* repeat */, function() {
  let value = GPIO.toggle(led);
  print(value ? 'Tick' : 'Tock', 'uptime:', Sys.uptime(), getInfo());
}, null);

// Publish to MQTT topic on a button press. Button is wired to GPIO pin 0
GPIO.set_button_handler(0, GPIO.PULL_UP, GPIO.INT_EDGE_NEG, 200, function() {
  let topic = 'devices/' + Cfg.get('device.id');
  let message = getInfo();
  let ok = MQTT.pub(topic, message, 1);
  print('Published:', ok ? 'yes' : 'no', 'topic:', topic, 'message:', message);
}, null);


print('************************* Starting fastclock stuff *********************');
load('api_net.js');
load('api_rpc.js');
load('api_fastclock.js');
print('loaded api modules');

Fastclock.set_update_handler(function (userdata) {
  print('Fastclock update received! ', Fastclock.isFastclock() ? 'FASTCLOCK' : 'REAL CLOCK');
  print('Name:', Fastclock.getName(), ' from ', Fastclock.getServerIp(), Fastclock.getServerPort());
  print('Clock:', Fastclock.getHours(), Fastclock.getMinutes(), Fastclock.getSeconds(), ' at day ', Fastclock.getSpeed(), Fastclock.isActive() ? '(running)' : '(--stopped--)');
  print('Message:', Fastclock.getMessage());
}, "test");

let port=2000;
let lastMessage = "";
let udpConnection = null;
let udpConnectString = "udp://239.50.50.20:2000";

print('initialized globals');

Timer.set(10000, false, function() {
  print('*** Binding to multicast port');
  Net.bind(':2000', function(conn, ev, ev_data) {
    print('UDP Event', ev);
    if (ev !== Net.EV_RECV) return;
    print('UDP Received:', ev_data);
  }, true);
}, null);

print('UDP server is listening on port ', port);



RPC.addHandler('Clock.Update', function(args) {
  lastMessage = args.message; // JSON.stringify(args);
  print("Received message: ", lastMessage);
  return true;
});

print('Added RPC handler for Clock.Update');

/*Timer.set(300, true, function() {
  if (lastMessage !== "") {
    print("Last Message: ", lastMessage);
    lastMessage = "";
  }
}, null);*/

print('Last-Message timer started');

RPC.addHandler('Clock.Broadcast', function(args) {
  Net.connect(udpConnectString, function (conn, event, data, user_data) {
    if (event === Net.EV_CONNECT) {
      Net.send(conn, user_data.message);
      Net.close(conn);
      lastMessage = 'SENT: ' + user_data.message; // JSON.stringify(args);
      print("Last Message: ", lastMessage);
    }
  }, args);
  return true;
});

print('Broadcast/Multicast RPC method added');