The repo has implementing an esp32 standalone MQTT audio streamer. Is is desinged to work as a satellite for Rhasspy (https://rhasspy.readthedocs.io/en/latest/). It supports multiple devices
Why do you think that https://github.com/Ai-Thinker-Open/ESP32-A1S-AudioKit is a good alternative to ESP32-Rhasspy-Satellite