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Confusion on number of devices required

Hi all, I want to form a thread network.

I have BorderRouter [Raspberry pi 3B flashed with Nordic alpha 4.1.0.1 image + nrf52840 dongle in NCP design] and is up and running i.e., could able to connect to the BorderRouter-AP SSID from mobile and can open WEB GUI[10.42.0.1] and form the network.

Now the real task began for me 

I have one EFR32 board that is flashed with ot-cli-ftd binary and is ready to join into the network.

But to add the above device into thread network, Commissioning is needed and to do Commissioning the image that I flashed doesn't have CLI to get masterkey and pskc that is needed by Joiner[EFR32 device].

From the nordic page I got know that I need one more Development board that needed to be flashed with some binary in all Commissioning with CLI , Wpantund and APP types.

Do I really need one more Development kit for the network or I can flash the binary that needed for commissioning in the same dongle that is connected with Raspberry PI that is connected in NCP design.

If I really need one more device, does that need to be only Development kit or dongle can also does the job?

Thanks in advance

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