GTFS -RT Tripupdate

I am trying to set GTFS RT and I have added the url in route-config.json to endpoint tripupdate.pb and update frequency to 45 seconds.  My otp instance with this GTFS RT tripupdate  is giving message as follows

INFO [graph-writer] (ResultLogger.java :47) [Feed=IR, type=gtfs-rt-trip-updates] Feed did not contain any updates.

Even though my tripupdate contains delayed vehicle departure, But my opt instance does not show it.

Please guide me to resolve this issue.

Thanks and Regards

Mahendra.J.Dubey