For engineers, software developers, and system integrators, a simulator is a sandbox. It allows you to emulate dozens (or even hundreds) of virtual thermostats, controllers, air handlers, and sensors over the BACnet IP protocol without plugging in a single physical controller.
If you need to simulate specific, complex device logic, these libraries allow you to script your own simulator: Get a Free 6-Month Trial to CAS BACnet Explorer - Chipkin free bacnet ip device simulator
While excellent for IP testing, free simulators have limitations: and system integrators
Setting Up a Simulation Environment — Practical Steps complex device logic
Quick checklist before using