.. BACpypes glossary Glossary ======== .. glossary:: 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.