View Source Grizzly.ZWave.Commands.S0SecuritySchemeGet (grizzly v8.6.6)

A controlling device MUST send the Security Scheme Get command immediately after inclusion of a node that supports the Security Command Class.

The Supported Security Schemes field is required by spec to always be 0x00. The 0th bit MUST be set to 0 indicating support for S0 (which is implied by the use of this command, so why it's required is beyond me). The remaining bits are reserved and must be set to 0 by a sending node.