/*
==========================================================================
Description:
- This is a function to initilize 4-way handshake
+ This is a function to initialize 4-way handshake
Return:
==========================================================================
Description:
When receiving the last packet of 4-way pairwisekey handshake.
- Initilize 2-way groupkey handshake following.
+ Initialize 2-way groupkey handshake following.
Return:
==========================================================================
*/