Case study

Etrel Load Guard Configurator: reconstructing the meter's UDP protocol

Etrel Load Guard Configurator is a Python CLI for discovering, reading and configuring Etrel Load Guard energy meters through a reconstructed UDP protocol. The author reports using REA with Ghidra on LoadGuardConfigurator.exe to recover packet fields and settings, then checking byte order and read-only measurements on a device. The tool includes dry-run writes and a simulator.

Targets: Protocol
Category: Community REA investigations
Relationship: Author-reported mixed workflow
Sources reviewed: 2026-11-07

Stars: 0
Last commit: 2026-10-22
Language: Python
License (GitHub): MIT

GitHub data as of 2026-11-09

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Requirements & limits

Prerequisites: Python 3.8 or later and network access to an Etrel Load Guard; discovery requires the same network segment.
Testing evidence: The author checked read-only operations on a Load Guard with software version 10 and hardware version 257.
Limits: Write commands pass tests and the simulator but have not been exercised on hardware.
License: MIT license.

Cite

BibTeX

@misc{etrel-load-guard-configurator-case,
  title = {{Etrel Load Guard Configurator: reconstructing the meter's UDP protocol}},
  howpublished = {\url{https://github.com/XavierGeerinck/etrel-load-guard-configurator}},
  url = {https://github.com/XavierGeerinck/etrel-load-guard-configurator},
  urldate = {2026-11-07},
  note = {Awesome REA entry: \url{https://awesomerea.org/resources/etrel-load-guard-configurator-case/}}
}

Plain text

Etrel Load Guard Configurator: reconstructing the meter's UDP protocol. https://github.com/XavierGeerinck/etrel-load-guard-configurator (accessed 2026-11-07). Awesome REA entry: https://awesomerea.org/resources/etrel-load-guard-configurator-case/

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About this entry

The description was reviewed against primary sources.

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Primary sources

README.md GitHub · XavierGeerinck/etrel-load-guard-configurator · Revision 6e1fc40
docs/PROTOCOL.md GitHub · XavierGeerinck/etrel-load-guard-configurator · Revision 6e1fc40