Bacnet device object and properties are not able to access but able to discover the devices

[iliyas18]

I am using Yabe bacnet simulator which has both device simulator and explorer. But if I use the bacstack library , I am not able to use the device objects and proeprties. It is discovering the device but not able to load object and properties for usage.

Simulator which I used https://sourceforge.net/projects/yetanotherbacnetexplorer.

But in Yabe device explorer it is working.

Simulator snap:

The error which I am getting:

err:  Error: ERR_TIMEOUT
    at Timeout._onTimeout (C:\Users\EpsilonPrime\node_modules\bacstack\lib\client.js:75:16)
    at ontimeout (timers.js:436:11)
    at tryOnTimeout (timers.js:300:5)
    at listOnTimeout (timers.js:263:5)
    at Timer.processTimers (timers.js:223:10)

The nodejs code which I have used:

const bacnet = require('bacstack');

// Initialize BACStack
const client = new bacnet({apduTimeout: 3000});

console.log(client);

//console.log(client.EventEmitter)


// Discover Devices
client.on('iAm', (device) => {
  console.log('address----------> ', device.address);
  console.log('deviceId---------->  ', device.deviceId);
  console.log('maxApdu---------->  ', device.maxApdu);
  console.log('segmentation---------->  ', device.segmentation);
  console.log('vendorId---------->  ', device.vendorId);
  console.log('object type---------->  ', device.vendorId);
  console.log('vendorId---------->  ', device.vendorId);
});


client.whoIs();

// Read Device Object
client.readProperty('192.168.14.87', {type: 8, instance: 2195695}, 28, (err, value) => {
  console.log('value: ', value);
  console.log('err: ', err);
});

In the below image it is displaying that it is discovering the devices but it is not able to find objects.

[Apollon77]

Please check the updated fork on https://github.com/BiancoRoyal/node-bacstack ... I was able successfully to communicate with the Room Simulator ... I only had trouble when it was running on the same device.

[jaydenpung]

I am having the same issue here. I am able to detect the bacnet device with BACnet Explorer:

There is also whois response:

However I am getting timeout. How should I troubleshoot this?

UPDATE: Turns out if I close the BACnet Explorer, the library works fine. I guess BACnet only support one poller?

[jscott3201]

BACnet is a long running UDP process in most stacks that binds to the adapter. Only one service can bind to 47808 at a time. Linux you can use ifconfig and setup a temporary adapter with IP/SUBNET.

192.168.1.1:47808 -> 192.168.1.2:47807 would be a valid path but not using the same source and destination IP. Basically mimicking the loop back behavior of the local machine at that point.

[jaydenpung]

Does this mean if I have two separate machine polling from a bacnet device, it will still work?

[jscott3201]

Yes you can multiple machines target a device or poll each other. You should always be able to WhoIs your virtual instances as they are required by spec to have a few default fields like Vendor ID. If you want to simulate two devices on a machine you need to setup separate Ethernet interfaces. Something like "sudo ifconfig eth0:1 192.168.1.1/24" would work in Linux. Each instance of the service has to bind to the UDP port.

[jaydenpung]

This is amazing info, really saved me a lot of time, thank you Scott!

[Ashok0111]

Hey guys , i too have the same issue, but I am running the nodejs code on Mac, and running the YABE on a virtual machine , on the same network. i am able to run whois. but unable to read values. can you help me on this?