Building a ESPHome firmware for a Xiaomi Bedside Lamp 2


TAGS: tech, iot

Pull latest ESPHome docker

sudo docker pull

Fetch the sources located at the following repository:

Create a secrets.yaml file

wifi_ssid: <my_wifi_ssid>
wifi_password: <my_wifi_password>
api_encryption_key: <my_generated_encryption_key>
ota_password: <my_ota_password>

Check this link for generating a 32-byte base64 encoded string.

Copy example.yaml to a custom configuration file (ie. bslamp2.yaml) and build the firmware using the following command:

sudo docker run --rm -v "${PWD}":/config -it compile bslamp2.yaml

If everything is okay, the generated firmware.bin file should be available in the folder .esphome/build/bedside-lamp/.pioenvs/bedside-lamp/

Backup the stock firmware:

sudo esptool -p /dev/ttyUSB0 -b 115200 read_flash 0x00000 0x400000 firmware_backup.img

Flash the firmware using the following commands:

sudo write_flash 0x8000 partitions.bin
sudo write_flash 0x1000 bootloader.bin
sudo write_flash 0x10000 firmware.bin

Check connection on the ESPHome local portal:

sudo docker run --rm --net=host -v "${PWD}":/config -it