12-23-2025, 08:12 AM
(This post was last modified: 12-23-2025, 08:13 AM by greywolf241.)
Thanks very much for sharing the protocol document — this is extremely helpful.
We’ve reviewed the KC868-Hx Smart Controller Communication Protocol v20.0.1, and the STRING command set for relay and input control is now clear.
To complete the ESP32 → ARM integration using our own ESP32 firmware (ESPHome), there are just a few remaining serial interface details we need to confirm:
1. UART connection on the ESP32 side
Which ESP32 GPIO pins are connected to the ARM CPU serial port?
(TX pin number and RX pin number)
2. Baud rate
The protocol document does not mention the baud rate.
Please confirm the default baud rate used for ESP32 ↔ ARM communication
(e.g. 9600 / 115200).
3. Serial format
Data bits / parity / stop bits
(e.g. 8N1?)
4. Line termination
Are commands terminated with:
\n
\r\n
or no line ending?
Once we have these settings, we should be able to implement full ARM relay and input control from ESPHome using the published STRING protocol, and integrate cleanly with Home Assistant.
Thanks again — the documentation and support so far have been excellent, and we’re happy to report back with working ESPHome examples once this is confirmed.
We’ve reviewed the KC868-Hx Smart Controller Communication Protocol v20.0.1, and the STRING command set for relay and input control is now clear.
To complete the ESP32 → ARM integration using our own ESP32 firmware (ESPHome), there are just a few remaining serial interface details we need to confirm:
1. UART connection on the ESP32 side
Which ESP32 GPIO pins are connected to the ARM CPU serial port?
(TX pin number and RX pin number)
2. Baud rate
The protocol document does not mention the baud rate.
Please confirm the default baud rate used for ESP32 ↔ ARM communication
(e.g. 9600 / 115200).
3. Serial format
Data bits / parity / stop bits
(e.g. 8N1?)
4. Line termination
Are commands terminated with:
\n
\r\n
or no line ending?
Once we have these settings, we should be able to implement full ARM relay and input control from ESPHome using the published STRING protocol, and integrate cleanly with Home Assistant.
Thanks again — the documentation and support so far have been excellent, and we’re happy to report back with working ESPHome examples once this is confirmed.