Module npdu 

NPDU encoding and decoding per ASHRAE 135-2020 Clause 6.

The Network Protocol Data Unit carries either an application-layer APDU or a network-layer message, with optional source/destination routing information for multi-hop BACnet internetworks.

Both directions hold DADR and SADR to NpduAddress::MAX_MAC_LEN octets (#1141), so the router, the non-router network layer and everything above them only ever see an address that some data link could carry.

Structs

Npdu

Decoded Network Protocol Data Unit (Clause 6.2).

NpduAddress

Network-layer address: network number + MAC address.

RejectMessageToNetwork

Decoded payload of a Reject-Message-To-Network control message.

Enums

NpduAddressField

The NPCI address an NpduDecodeError::AddressTooLong concerns.

NpduDecodeError

Why decode_npdu refused an NPDU.

Constants

BACNET_PROTOCOL_VERSION

BACnet protocol version (always 1).

Functions

decode_npdu

Decode an NPDU from raw bytes.

decode_reject_message_to_network

Decode the fixed three-octet Reject-Message-To-Network payload.

encode_npdu

Encode an NPDU to wire format.