* @param relayState will be set to RelayState/TARGET value accompanying message
* @param genericRequest reference to interface for accessing transport request to decode
* @param policy reference to policy containing rules, MetadataProvider, TrustEngine, etc.
* @param relayState will be set to RelayState/TARGET value accompanying message
* @param genericRequest reference to interface for accessing transport request to decode
* @param policy reference to policy containing rules, MetadataProvider, TrustEngine, etc.