Choose the PSK of the AKM suite of WAPI as the module of PSK. BK is set by gb15629dot11wapiConfigPSKValue. Another alternative method is that using password-key algorithm to set PSK. This variable provides a way to enter a password. When the object is being writen, WAPI entity will use the password - key algorithm to export a pre-shared key, at the same time, it fill the gb15629dot11wapiConfigPSKValue with the pre-shared key. This object is logically write-only. Reading the variable will return the status of unsuccessfull, meaningless or 0.