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For the complete documentation index, see llms.txt. This page is also available as Markdown.

Release notes

Summary of changes in P1 Modbus Dongle firmware releases.

Firmware v2

2.3.0 — 24 June 2026

  • Added firmware updating directly from the Device Manager.

  • Added stable-version checking and update notifications.

  • Added a Modbus RTU request monitor.

  • Added Device Manager and RGB LED warnings when the RS485 module is missing.

  • Updated the ESP32 Arduino SDK to 3.3.10.

2.2.3 — 24 June 2026

  • Added the SunSpec model 203 mapping.

2.2.2 — 24 June 2026

  • Added EM111 emulation.

  • Corrected word order handling for EM330 and EM111 mappings.

2.2.1 — 3 May 2026

  • Synchronised Modbus mappings with the DSMR-API implementation.

  • Refactored the mapping definitions for lower overhead and easier maintenance.

2.2.0 — 2 May 2026

  • Restored the standard defaults: Default P1 mapping, device ID 43, 38400 8E1.

  • Added the P1MB / Wallbox mapping.

  • Set the default D1MC RGB LED brightness to 10%.

2.1.1 — 26 April 2026

  • Added configurable RGB LED brightness.

  • Corrected P1 output mapping and the NRGD P1 output LED behaviour.

2.1.0 — 25 April 2026

  • Added selectable P1 and HAN smart meter sources on compatible hardware.

  • Expanded persistent configuration and Device Manager controls.

  • Added the current RGB status LED behaviour and factory-reset flow.

2.0.1 beta — 12 April 2026

  • First public beta of the unified firmware v2 architecture.

  • Introduced runtime-selectable Modbus mapping profiles.

Firmware v1

1.5.10

  • Final v1 maintenance release.

  • Recompiled with updated DSMR parsing to accept current values from Kenter meters.

Earlier v1 releases used separate firmware variants for mappings and communication defaults. They remain available for existing installations through the web installer.

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