The SecurityGroupId with DataType String is the identifier for a SecurityGroup in the Security Key Server. It is unique within a SKS.

The parameter is null if the SecurityMode is NONE_1.

If the SecurityMode is not NONE_1 the SecurityGroupId identifies the SecurityGroup. The SecurityGroup defines the SecurityPolicy and the security keys used for the NetworkMessage security. The PubSubGroup defines the SecurityMode for the NetworkMessages sent by the group.