I own a Surface Pro 3 which has only one USB-Port. Can I set up nRF-Connect with the internal Bluetooth instead of using an USB Hub to connect two development kits?
It is not possible. nRF Connect is using serialization driver which communicates with serialization firmware in DK.That is something completely different than "normal" bluetooth dongles that are driven by HCI-based communication.
Unfortunately, nRF connect uses the serialized softdevice (our bluetooth stack) API together with the pc-ble-driver. So you must have a nRF5x board programmed with the connectivity FW connected to your tablet.
you beat me to it, didn't refresh the page before I posted:)