RTRT make use of the Client Mode which is available on decoders, which is configured through the decoder browser interface, this applies for both passive and active applications. Client mode allows RTRT to pull data directly from the decoder when it is online, and also offers some remote control of the decoder through their platform.
When using Loop Boxes you must also enable the option to use Loop ID in your RTRT setup, then assign the relevant Loop IDs. At this time stored data may not be handled well if it comes from an unexpected timing system.
To setup client mode for use with RTRT please contact RTRT directly to get the correct URL and port number for their servers, they have a guide for using client mode of race result decoders with their platform.