Multiple slaves (BMD 350 -custom board ) should be connected with one central module( NRF52832 - Holy IoT). Self test should be incorporated. eg. slave 1 , slave 2 , slave 3 ... slave 12 will be coded to the custom boards. Send command will find all slaves.
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I can help you in what you need I have good experience of embedded programming. I have worked on nrf networking and multi device communication.
I have working experience with Nordic devices(nrf51, nrf52) and BLE. I have previously worked on a wearable (nrf52832), BLE Lamp(nrf52832), GPS tracker with BLE (nrf52810) and ESB Sniffer(nrf51822).