This is an experiment of implementing Nordic NUS service on Zephyr v1.12.0.
Apply the code to <Zephyr_Root>/samples.
2018/06/26
Added LESC pairing on both sides, support Numeric Comparison (default) or Passkey Input. NOTE Central side needs below commit: https://github.com/zephyrproject-rtos/zephyr/commit/b35ed7e79ca3139018876b5585921934cf62ce63
Jun Qing Zou, Nordic Semiconductor ASA (Japan office)