NRF52840 Thread NCP
Pi Border Router with nRF52840 thread NCP
https://electronut.in/nrf52840-thread/
https://www.nordicsemi.com/DocLib/Content/SDK_Doc/Thread_SDK/v2-0-0/index
Downloaded the nRF5 SDK for Thread and Zigbee 2.0.0
https://www.nordicsemi.com/Software-and-Tools/Software/nRF5-SDK-for-Thread-and-Zigbee/Download
https://groups.google.com/forum/#!topic/openthread-users/9TFIATWWrxw