NRF5340 audio DK how to use with Raspberry PI 3 B+ as a gateway

Hi, I'm working with just one NRF5340 audio DK and I saw this ticket where it was commented that it is possible to reduce the use of 2 NRF5340 audio DK's to just 1 using a raspberry pi model B+ as a gateway.

I would like to know how to configure the raspberry being a gateway along with the NRF5340 audio DK being a headset.

Thanks & regards,
Kátia Tenório.

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