This repository contains a configuration file that can be used to flash TO-Q-SYS-JWT with ESPHome using Libretiny as it has a CBU (BK7231N) chip built-in.
More details about the device are documented at the ESPHome devices page.
The UART buffer size needs to be increased since the device will not function properly otherwise. The MCU sends datapoints quickly and needs 300+ bytes of RX buffer space available at the receiving side. The main CBU chip is not able to process the default 64-byte buffer fast enough and some data is discarded: as a result only a small amount of data points is observed by the Tuya module in esphome.
As of Libretiny 1.8.0 it is possible to adjust the RX buffer size using a framework option so make sure to set LT_SERIAL_BUFFER_SIZE: 512 which is large enough for the incoming messages from the MCU.
Flashing can be done via UART1 using an UART:
python3 -m venv esphome-venv
. esphome-venv/bin/activate
pip3 install esphome ltchiptool
esphome run --device /dev/<your-serial-device-name> <path-to>/config-tongou-to-q-sys-jwt.yamlMake sure the device has a stable Wi-Fi connection, otherwise attaching to UART again will be needed again if OTA is interrupted.
python3 -m venv esphome-venv
. esphome-venv/bin/activate
pip3 install esphome
esphome run --device <device-ip> <path-to>/gas-alarm-DY-RQ400A.yaml