"Streaming" sound from home assistant to a connected wifi speaker

Hello

HassOS is installed on a pi3 with no sound output. In another room, I have a xiaomi Aqara ZHWG11LM flashed with OpenWrt and nicely integrated with HA as a zigbee repeater with MQTT to manage light and TTS.

The nice thing about this device is that it has a speaker and is connected to my network. I would like to use it as a spotify connect speaker. As it is not able to manage librespot/raspotify, my idea is to install spotify connect on my pi3 and to “pipe/stream” the sound from HA to the device but can’t manage to do that.

I found various resources and hint that pulseaudio could do the trick if well configured but can’t make it work. So far I’ve setup a pulseaudio server on the xiaomi with a sink but I’m not sure it works and can’t manage to configure anything on hassos, it doesn’t show up when I list the sinks with “pactl list sinks”. Or maybe there is a better solution ?

Any help would be great !

Thanks !