sonoff-knxd

This is an alternative firmware for Sonoff (or other ESP8266 based) devices for integrating in a KNX installation through eibd/knxd. Unlike other available projects, this Arduino Sketch communicates to the KNX bus via a TCP socket to an eibd/knxd daemon. This solution does not use IP multicast and therefore benefits from the TCP connection reliability on the transport layer. Instead of the standardized KNX multicast or tunneling protocol it requires a running eibd/knxd daemon which is connected to the KNX bus.

It's a simple project, all needed configuration (WLAN access / KNX group addresses) has to be done inside the Sketch before the compilation. The modules cannot be configured using the ETS software.

Arduino IDE settings

Boards Manager URL: http://arduino.esp8266.com/stable/package_esp8266com_index.json

Used libraries

• Time (1.6.1)
  • https://playground.arduino.cc/Code/Time/
  • https://www.pjrc.com/teensy/td_libs_Time.html
  • https://github.com/PaulStoffregen/Time
• SparkFun SCD30 Arduino Library (1.0.20) (for CO2 traffic light with Sensirion SCD30)
  • https://github.com/sparkfun/SparkFun_SCD30_Arduino_Library
• Grove - LCD RGB Backlight (1.0.2) (optional for CO2 traffic light with Sensirion SCD30)
  • https://github.com/Seeed-Studio/Grove_LCD_RGB_Backlight

Tested hardware

Sonoff S20 / Nous A1T

Option	Value
Board	Generic ESP8266 Module
Flash Size	1MB (FS:64KB OTA:~470KB)

Sonoff 4CH

Option	Value
Board	Generic ESP8285 Module
Flash Size	1MB (FS:64KB OTA:~470KB)

CO2 traffic light with Sensirion SCD30 air quality sensors

Option	Value
Board	Adafruit Feather HUZZAH ESP8266
Flash Size	4MB (FS:2MB OTA:~1019KB)