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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