test：
1、sdk4.30
2、simple_peripheral with rtos
3、development board
4、multi-connection
The two mobile phones are connected with nrf at the same time, and after 3-5 seconds CC2642 actively disconnects, the disconnect code 0x8 or 0x22 will appear.
Sometimes an active disconnect takes 5 seconds to enter the disconnect event.
Sometimes the active disconnect, wait for a long time will not enter the disconnect event.
