nRF52840 Dongle firmware

I've made a dongle using the nrf52840, and I'd like this custom device to work with the RSSI Viewer and Bluetooth Low Energy on nRF Connect for desktop; what do I need to do to achieve this? Do I need to write a specific firmware to my device so that RSSI Viewer and Bluetooth Low Energy can recognise my device? Is there any development material available for the nRF52840 Dongle?

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