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Thanks to u/OldAutomator on r/BuildingAutomation for the field testing and identifying the MSTP routing bug.

Fixed

  • BACnet MSTP ReadProperty now correctly routes through IP-to-MSTP routers. v2.0.x emitted NPDU 0x01 0x04 (no destination specifier), causing every MSTP device behind a router to respond "Object not found." Now emits 0x01 0x24 <DNET> <DLEN> <DADR> 0xFF when a device was discovered via routed Who-Is.
  • CLI Total devices summary now reports unique hosts, matching engine log and GUI stats bar.

Added

  • --whois-chunk SIZE for large-site discovery. Splits Who-Is by instance range to avoid I-Am storms. Opt-in; default is unchanged single broadcast.
  • +30 regression tests (128 total).

See CHANGELOG.md (github.com) for the full entry.

Source: README.md, updated 2026-04-18