Software · Raspberry Pi & electronics

OTGW-firmware

A ESP8266 devkit firmware for the Nodoshop version of the Opentherm Gateway (OTGW).

Completely free
Open source
No account

Overview

OTGW-firmware is a microcontroller program.

Features described in its GitHub repository: API for automation and integration, web interface.

Services and protocols mentioned: MQTT and S3.

Overview written by LicitPro from the documentation published by the authors and the cited sources; we have not tried the resource ourselves.

Excerpts that establish this information

“A ESP8266 devkit firmware for the Nodoshop version of the Opentherm Gateway (OTGW)” — GitHub, 10 November 2026
“It runs on an ESP32-S3 (LOLIN S3 Mini or S3 Mini Pro) in the traditional NodoShop OTGW with the PIC co-processor, monitors the OpenTherm bus between your thermostat and boiler, and connects your heating system to…” — GitHub, 10 November 2026
“It runs on an ESP32-S3 (LOLIN S3 Mini or S3 Mini Pro) in the traditional NodoShop OTGW with the PIC co-processor, monitors the OpenTherm bus between your thermostat and boiler, and connects your heating system to…” — GitHub, 10 November 2026

At a glance

OTGW-firmware is completely free: it is open source software, and every feature is available without paying or subscribing.

Its licence (GPL-3.0) is a copyleft open source licence: you may use, study, modify and redistribute it, including commercially; modified versions must keep the same licence.

Strengths

Open source code
No account needed
Commercial use allowed

Sources and checks

Facts collected from GitHub (credit card, account, source code, publisher, licence, free status, platforms, commercial use) — 9 November 2026
Last technical check: 9 November 2026
Description from github.com — Dépôt GitHub rvdbreemen/OTGW-firmware (GPL-3.0-only)

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