there is a big problem using alexa media player, the integration doesn’t work properly, but maybe using just an esp32 and pair it to alexa via bluetooth it would be enought, that way we could send notifications and use music assistant. there are some speakers with a esp32 inside that can be “hacked” to do this, but i cant read anything to do it just with a esp32. when i say alexa i say any bluetooth speaker
As I understand it, the integration is limited to functions that are allowed by an unofficial API, and local casting in not one of those functions.
Are you asking if it is possible to stream audio via WiFi from HA to an ESP32 then transmit via BT to an Alexa device? That’s a lot to ask of a little ESP32… but the Squeezelite32 repo seems to indicate it is possible.