1. SDK 和SoftDevices 兼容性问题。

第一次接触时候，一直用SoftDevices 7.0.0 和SDK 5.2.0一直跑不起来，最后发现是sdk 不支持7.0的协议栈。

nRF51 SDK v. 5.2.0
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Following toolchains/devices have been used for testing and verification:
    - ARM: MDK-ARM Version 5.10.x
    - GCC: gcc-arm-embedded 4.7 2013q1
    - IAR: Embedded Workbench for ARM 6.60
    - Windows XP SP3 32 bit
    - Windows 7 SP1 64 bit
    - Windows 8.0/8.1
    - The BLE example applications for HID Keyboard and HID Mouse have been tested with HID host running on Windows 8.1.

Tested with devices:

    - nRF51822 QFAAG0
    - nRF51822 QFAAGC
    - nRF51822 QFAAFA
    - nRF51422 QFAAE0
    
    For others devices, use SDK 4.x.x

Supported SoftDevices:

    - S110 6.0.0
    - S120 1.0.0-1.alpha
    - S210 3.0.0
    - S310 1.0.0

Supported boards:

    - PCA10000 v1.0 (Only for use with Master Emulator)
    - PCA10000 v2.1.0 and 2.2.0
    - PCA10001 v2.1.0 and 2.2.0
    - PCA10004 v2.1.0
    - PCA10005 v2.1.0 and 2.2.0
    - PCA10003 v3.0.0

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