ESPHome is the perfect solution for creating custom firmwares for your ESP8266/ESP32 boards. This Rockon contains the standalone ESPHome Command Line and Web Dashboard (HomeAssistant is a separate Rockon, whose docker image does not allow for installing add-ons like this).

Note: this Rockon requires the net=host option to enable device connections for ESP firmware updates; it also requires to be run in privileged status according to the documentation (https://esphome.io/guides/getting_started_command_line). Typically, this Rockon would be run after installation during firmware development or update work and, when not needed, be stopped again. It's not necessary to be active for ESP devices to be recognized by Home Assistant (this is handled through HomeAssistants native ESPHome integrations.

website: https://esphome.io/
image: ghcr.io/esphome/esphome