While there is the excellent https://github.com/ccutrer/balboa_worldwide_app project that handled the new WiFi capable BP range of controllers, this is NOT compatible with the older GL/EL range such as the GL2000.
The aim of this project is to achieve similar results
App for ESP32 or ESP8266 that sends current status including temperature to Home Assistant and also simple web status page with live updates via WebSocket
Original discssion regarding support for spa controllers with 8 pin rather than 4 pin main panels
- 8-pin Molex ccutrer/balboa_worldwide_app#14
- Pin 1+3 - RS485
- Pin 2,4 - Unknown
- Pin 5 - Clock?
- Pin 6 - 9.7V - PSU? - limited current avail
- Pin 7+8 - GND