I have been asked to develop something with 2-way audio in a closed room between people in the room and someone out of sight (and hearing).
The audio will only be upon request, not a constant stream.
Global idea : people in the room push a button to record a short message. The person out of sight can hear te message and respond to it. It will then be played in the room again.
Currently there is allready a Pi with Pimatic in the room. It’s not a big issue to buy extra hardware (without spending hundreds of euros).
Somehow I keep thinking of something with whatsapp and sending audio messages.
Any help or ideas is appreciated