ts-bacnet/examples/subscribe-cov.js

The BACnet protocol library written in pure JavaScript.

/**
 * This script will discover tze devices and tries to register a COV for ANALOG_INPUT 0
 * The script works very well when the Yabe Room Simulator exe is running
 *
 * After 20s the subscription is cancelled by updating it with a lifetime of 1s
 */

const Bacnet = require("../index");

// you need to run the Weather2 Station of the YABE BACnet package
// https://sourceforge.net/projects/yetanotherbacnetexplorer/

// create instance of Bacnet
const bacnetClient = new Bacnet({ apduTimeout: 10000, interface: "0.0.0.0" });

// emitted for each new message
bacnetClient.on("message", (msg, rinfo) => {
  console.log(msg);
  if (rinfo) console.log(rinfo);
});

// emitted on errors
bacnetClient.on("error", (err) => {
  console.error(err);
  bacnetClient.close();
});

// emmitted when Bacnet server listens for incoming UDP packages
bacnetClient.on("listening", () => {
  console.log("sent whoIs " + Date.now());
  // discover devices once we are listening
  bacnetClient.whoIs();
});

// emitted when "Change of object" Messages are coming in
bacnetClient.on("covNotifyUnconfirmed", (data) => {
  console.log("Received COV: " + JSON.stringify(data));
});

// emitted when a new device is discovered in the network
bacnetClient.on("iAm", (device) => {
  console.log("Received iAm: " + JSON.stringify(device, null, 4));
  // address object of discovered device,
  // just use in subsequent calls that are directed to this device
  const address = device.header.sender;

  //discovered device ID
  const deviceId = device.payload.deviceId;
  console.log("Found Device " + deviceId + " on " + JSON.stringify(address));

  // Subscribe changes for RESENT_VALUE of ANALOG_INPUT,0 object
  // lifetime 0 means "for ever"
  bacnetClient.subscribeCov(
    address,
    { type: 0, instance: 0 },
    85,
    false,
    false,
    0,
    (err) => {
      console.log("subscribeCOV" + err);
    }
  );

  // after 20s re-subscribe but with 1s lifetime to stop it
  // I had issues with "cancel" call with the simulated device
  setTimeout(() => {
    bacnetClient.subscribeCov(
      address,
      { type: 0, instance: 0 },
      85,
      false,
      false,
      1,
      (err) => {
        console.log("UnsubscribeCOV" + err);
      }
    );
  }, 20000);
});

// after 30s end the connection
setTimeout(() => {
  bacnetClient.close();
  console.log("closed transport " + Date.now());
}, 30000); // do not close to fast