.. BACpypes glossary Glossary ======== .. glossary:: bound The tight coupling of a client with a service. All clients must be bound to some server and vice versa. client A component that consumes packets from a server to provide some functionality. server A component that provides a service to a client. upstream Something going up a stack from a server to client. downstream Something going down a stack from a client to a server. stack A sequence of communication objects organized in a semi-linear sequence from the application layer at the top to the physical networking layer(s) at the bottom. discoverable Something that can be determined using a combination of BACnet objects, properties and services. For example, discovering the network topology by using Who-Is-Router-To-Network, or knowing what objects are defined in a device by reading the *object-list* property.