The device uses this property to set password for WLAN settings. If the password is shorter than 63 bytes, all remaining bytes after the password should be set to zeros.
For EAP-PEAP authentication, the maximum length of password is 32 bytes. The real password has to be <= 32 bytes, all bytes after the desired password must be set to zeroes.
For security, the Get request for this property will always return a value with 63 zeroes, so you can only set the password and not get it.