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nRF52 DK (pca10040) & nRF connect

Hello all, I'm using nRF52 DK.

I'm going to use this DK as a master of BLE, and send information which is from BLE peripheral device to another board using SPI.

Anyway, my question is about nRF connect app in Windows.

When I connect nRF52 DK which was not programmed to PC and turn on nRF connect app, it shows a message like this: "Device must be programmed, do you want to proceed".

If I click "Yes", program was set automatically.

After that, I saw "Baud rate: 1000000, Flow control: none. Parity: none" in Log.

Also, if I connect nRF52 DK to BLE peripheral device using this app, log shows information which was sent by BLE peripheral.

I'm curious about what is that program.

Is there anyone who knows about this program, which was automatically downloaded? 

I want to know this because with this program, I think it is comfortable to write code about BLE part.

Thanks for all!

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