Module decode 

BACnet frames decoded for people: what the TUI’s capture screen and the MCP server’s bacnet_decode tool show, with no network traffic.

• frame reads a frame of any link the stack taps (B/IP, B/IPv6, BACnet/SC, MS/TP), or a bare NPDU, as far as a one-line summary needs.
• tree decodes a frame, an NPDU or an APDU into a tree of fields, each with the octets it came from; service parameters are walked tag by tag.
• decode_npdu_layer reads the network and application layers that every link carries the same way.

Every decoder takes untrusted octets: a malformed frame becomes a problem in the result, never a panic. A character string in a frame is whatever its sender wrote, so a tree field quoting one says so (tree::Field::device_text).

Modules

frame

One frame of any link the stack taps, read as far as its list row needs: the link message, the network layer and the APDU’s header.

tree

A frame decoded into a tree of fields, each with the octets it came from: the capture screen’s decode tree, and the range its hex view highlights for the selected field.

Structs

DecodedApdu

Decoded application layer.

DecodedNpdu

Decoded network layer.

Functions

decode_npdu_layer

Decode the NPDU layer a BVLL message carries.