What is the BACnet Virtual Link Layer? Key Takeaways : What is the BACnet Virtual Link Layer? The BACnet Virtual Link Layer (BVLL) abstracts the physical network, allowing BACnet devices to communicate over any IP-based transport. It provides a standardized interface between BACnet messages and the underlying IP or IPv6 layers. BVLL ensures interoperability between devices, regardless of whether they use Ethernet, Wi-Fi, or VPN tunnels. It introduces specific BVLL message types to manage broa...