Free Open Source BACnet Explorer and REST API Toolkit

• Building managers — See what's on your BACnet network without buying proprietary software.
• System integrators — Diagnose multi-vendor networks. Read objects, write commands, test points.
• Developers — Integrate BACnet into your applications via the REST API or Clojure REPL.
• Commissioning agents — Verify device configurations and control sequences during commissioning.
• Students & educators — Learn the BACnet protocol hands-on with zero barrier to entry.

Wacnet is a BACnet webserver and toolkit.

It can be started immediately without any installation, provided you have Java (min 1.8) installed on your machine.

You can browse a BACnet network using the Explorer, send commands on the network using the REPL or the web API, and record historical data with the help of Vigilia.

Wacnet is open source and comes with absolutely no warranty, like specified in the GPLv3 licence. The source code is on GitHub.

BACnet promises interoperability between devices from multiple manufacturers — but the tools to actually use that interoperability have traditionally been expensive and complex.

Most commercial BACnet tools cost hundreds to thousands of dollars per seat, require installation wizards, license dongles, and vendor-specific training. Building managers often don't know what's on their BACnet network because the only way to browse it requires proprietary software. Developers face cryptic tools that make BACnet harder than it needs to be.

Wacnet changes that. Download a single file, double-click, and you're browsing your network in seconds. It's the Notepad of BACnet tools — free, simple, and always available when you need it. No license key, no subscription, no vendor lock-in.

Wacnet is a modern, open-source alternative to YABE (Yet Another BACnet Explorer) and proprietary tools like CAS BACnet Explorer, designed for web-native workflows. Unlike YABE, Wacnet provides a full REST API for automation and integration, and unlike commercial tools, it costs nothing and runs on any platform.

• BACnet Services: ReadProperty, ReadPropertyMultiple, WriteProperty (with priority levels 1–16), WhoIs/IAm, WhoHas/IHave, SubscribeCOV
• Network: BACnet/IP, BBMD support, Foreign Device Registration (FDR), routed BACnet/MSTP networks (via IP router)
• Object Types: All standard BACnet objects — Analog Input/Output/Value, Binary Input/Output/Value, Multi-state, Schedule, Calendar, Trend Log, Notification Class, and more
• API Formats: JSON, Transit+JSON, Transit+MessagePack, EDN — all endpoints CORS-enabled
• Automation: Clojure REPL (nREPL on port 47999) for scripting batch operations, custom BACnet sequences, and live prototyping

List all BACnet devices on your network:

 curl http://localhost:47800/api/v1/bacnet/devices 

Read a temperature sensor (device 1234, analog-input 1):

 curl http://localhost:47800/api/v1/bacnet/devices/1234/objects/analog-input.1 

Python — scan and print all devices:

 import requests devices = requests.get("http://localhost:47800/api/v1/bacnet/devices").json() for d in devices:     print(f"Device {d}: {requests.get(f'http://localhost:47800/api/v1/bacnet/devices/{d}').json()}") 

Full API documentation is available via the built-in Swagger UI at http://localhost:47800/api/ once Wacnet is running.

• Windows 10/11 — Double-click the JAR or run from Command Prompt. No .exe installer required — Wacnet runs as a portable executable JAR file.
• macOS — Works out of the box with the built-in Java runtime. A lightweight BACnet tool for Mac users.
• Linux / Raspberry Pi — Ideal for permanent headless deployments. Run Wacnet on a Raspberry Pi as a dedicated BACnet gateway and Vigilia logger.
• USB portable — Copy the JAR to a USB key and run it on any machine with Java — no installation, no trace left behind.

• No admin rights or elevated privileges required
• Runs entirely inside the Java Virtual Machine (JVM) — no system-level modifications
• Does not "phone home" — all network traffic is local BACnet/IP only (unless you enable Vigilia cloud logging)
• No data collection, no telemetry, no analytics
• Open source (GPLv3) — audit the code yourself on GitHub

Wacnet comes with a built-in logger for Vigilia, enabling it to scan the BACnet network at regular intervals and push data to the cloud. Features include:

• Configurable scan intervals (from 5 minutes)
• Parallel device scanning for large networks
• Selective object targeting per device
• Device ID filtering (include/exclude ranges)
• Auto-start logging via command-line flags
• Proxy support for corporate networks

Please see this guide to start logging your network.

Is Wacnet really free?
Yes. Wacnet is released under the GNU General Public License v3 (GPLv3). You can use it, modify it, and distribute it freely. The source code is on GitHub.

Does it work with BACnet/MSTP?
Wacnet communicates via BACnet/IP. If your MSTP devices are behind a BACnet router that bridges to IP, Wacnet can reach them — it supports routed networks and shows routing information.

Can I run it on a server permanently?
Yes. Use --headless --no-browser to run without a GUI. Combine with Vigilia flags to auto-start logging on boot.

How many devices can it handle?
There is no hard limit. Wacnet has been used on networks with hundreds of devices. For very large networks, you can run multiple instances scanning different device ranges.

Can I write values to BACnet objects?
Yes. Via the API or the REPL, you can write to any writable BACnet property with priority level support.

Wacnet will usually try to discard most of the communication errors. For deep analysis, it's suggested to use Wacnet in combination of Wireshark: Send command manually with Wacnet and check the errors with Wireshark.

GNU General Public License version 3.0 (GPLv3)