Case study

lochinvar-native-modbus: mapping Knight boiler telemetry

lochinvar-native-modbus reconstructs the read-only Modbus register map exposed by Lochinvar Knight boilers through the SMART SYSTEM display's USB PC Connection port. Probe scripts and display comparisons identify telemetry for temperatures, firing rate, flame signal and counters; ESPHome and MQTT bridges publish readings to Home Assistant.

Targets: Protocol
Category: Independent reconstruction cases
Relationship: Independent reconstruction project
Sources reviewed: 2026-11-06
Evidence class: C2 code & docs, no demo or download

Stars: 0
Last commit: 2026-11-04
Language: Go

GitHub data as of 2026-11-10

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Evidence

Observed: Code, documentation and a demo observed; no download method found.
Checked: 2026-11-08

How evidence classes are assigned

Requirements & limits

Prerequisites: A boiler with the SMART SYSTEM display and USB PC Connection port, a USB cable, and an ESP32-S3 board or Linux Docker host.
Prerequisites: Home Assistant is required; the MQTT route also needs a broker.
Limits: Only read requests are implemented; lockout codes are not mapped, and some values remain guesses.
License: No licence file in the repository.

Cite

BibTeX

@misc{lochinvar-native-modbus-case,
  title = {{lochinvar-native-modbus: mapping Knight boiler telemetry}},
  howpublished = {\url{https://github.com/KB1RMA/lochinvar-native-modbus}},
  url = {https://github.com/KB1RMA/lochinvar-native-modbus},
  urldate = {2026-11-06},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/lochinvar-native-modbus-case/}}
}

Plain text

lochinvar-native-modbus: mapping Knight boiler telemetry. https://github.com/KB1RMA/lochinvar-native-modbus (accessed 2026-11-06). Awesome REA entry: https://awesomerea.org/resources/lochinvar-native-modbus-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

docs/reverse-engineering-log.md GitHub · KB1RMA/lochinvar-native-modbus · Revision 55c207a
README.md GitHub · KB1RMA/lochinvar-native-modbus · Revision 55c207a