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github.com/Laxilef/OTGateway @1.6.0
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● updated 54d agodev · 2026-05-17★ 4485 open issues
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README
Features
- DHW temperature control
- Heating temperature control
- Smart heating temperature control modes:
- PID
- Equithermic curves - adjusts the temperature based on indoor and outdoor temperatures
- Hysteresis setting (for accurate maintenance of room temperature)
- Ability to connect additional (external) sensors: Dallas (1-wire), NTC 10k, Bluetooth (BLE). Makes it possible to monitor indoor and outdoor temperatures, temperatures on pipes/heat exchangers/etc.
- Emergency mode. In any dangerous situation (loss of connection with Wifi, MQTT, sensors, etc) it will not let you and your home freeze.
- Ability of remote fault reset (not with all boilers)
- Diagnostics:
- Displaying gateway status
- Displaying the connection status to the boiler via OpenTherm
- Displaying the fault status and fault code
- Displaying the diagnostic status & diagnostic code
- Display of the process of heating: works/does not work
- Display of burner (flame) status: on/off
- Display of burner modulation level in percent
- Display of pressure in the heating system
- Display of current temperature of the heat carrier
- Display of return temperature of the heat carrier
- Display of setpoint heat carrier temperature (useful when using PID or Equitherm)
- Display of the process of DHW: working/not working
- Display of current DHW temperature
- And other information...
- Home Assistant integration via MQTT. The ability to create any automation for the boiler!
Documentation
All available information and instructions can be found in the wiki:
- Home
- Quick Start
- Build firmware
- Flashing via Web Flasher
- Flashing via ESP Flash Download Tool
- Settings
- Equitherm mode
- PID mode
- Logs and debug
- Compatibility
- Boilers
- Boards
- Temperature sensors
- FAQ & Troubleshooting
- OT adapters
- Adapters on sale
- DIY
Gratitude
- To the developers of the libraries used: OpenTherm Library, ESP8266Scheduler, ArduinoJson, NimBLE-Arduino, ArduinoMqttClient, ESPTelnet, FileData, GyverPID, GyverBlinker, OneWireNg & OneWire
- To the PlatformIO Team
- To the team and contributors of the pioarduino project
- To the BrowserStack team. This project is tested with BrowserStack.
- To the PVS-Studio - static analyzer for C, C++, C#, and Java code.
- And of course to the contributors for their contribution to the development of the project!
Core symbols most depended-on inside this repo
send
called by 64
lib/BufferedWebServer/BufferedWebServer.h
roundf
called by 61
src/utils.h
publish
called by 56
lib/MqttWriter/MqttWriter.h
sendRequest
called by 53
lib/CustomOpenTherm/CustomOpenTherm.h
s
called by 52
src_data/scripts/chart.js
l
called by 51
src_data/scripts/chart.js
makeConfigTopic
called by 51
lib/HomeAssistantHelper/HomeAssistantHelper.h
o
called by 43
src_data/scripts/chart.js
Shape
Languages
TypeScript71%
C++28%
Python1%
Modules by API surface
src_data/scripts/chart.js958 symbols
src/OpenThermTask.h64 symbols
src/HaHelper.h55 symbols
src_data/scripts/utils.js34 symbols
src/utils.h34 symbols
lib/NetworkUtils/NetworkMgr.h34 symbols
src/SensorsTask.h29 symbols
src/Sensors.h25 symbols
src/MqttTask.h23 symbols
lib/CustomOpenTherm/CustomOpenTherm.h18 symbols
src/MainTask.h15 symbols
lib/HomeAssistantHelper/HomeAssistantHelper.h15 symbols
For agents
$ claude mcp add OTGateway \
-- python -m otcore.mcp_server <graph>