Phone can connect to multiple devices, otherwise you couldn't have bluetooth keyboard, mouse and headphones connected concurrently.
Can that 'bluetooth audio receiver' do BLE? Typical bluetooth speakers/headphones can't so you can't connect MDBT42Q to it. nrf52 can only do BLE not classic Bluetooth, audio is classic bluetooth. There is audio over BLE but it is still very new and needs few years to replace classic bluetooth.
@fanoush coming back to this. I just realized the receivers are Bluetooth 5.0 and they DO support BLE, so maybe some light at the end of the tunnel here. In this case, I could likely use nrf52 to communicate between the modules, I guess it just comes down to figuring out what commands need to be sent in order to have the receiver interact, ie: play, pause, next.
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