SerializationDefaults The SerializationDefaults is the class used to give the MessageSerializer tips on how to handle your class. These defaults can make it so that you when you go to define the classes for your messages you will need a minimum of attributes and information of that nature on the actual classes. Endianness There are three types of Endianness the MessageSerializer supports: Little, Big and System. Little and Big are self-explanatory. System means to use whatever the system the MessageSerializer is running on. When determining what Endianness to use for a field in a message the following priority is used: If specified, the Endianness from the MessageProperty attribute on the property for the field in your class. If specified, the Endianness from the MessageClass attribute on your class. The Endianness from the SerializationDefaults Default: System TypeSelectors TypeSelectors is a list of type TypeSelectorBase that is iterated through for each property on your class to determine the TypeSerializer that should be used to process that field of your message. See TypeSelector for more information. PropertyRules PropertyRules is a list of type IPropertyRule that is iterated through for each property on your class to determine the PropertyRule(s) that should be used for that field of your message. See PropertyRule for more information.