Spec Conformity of PSIs IEC 60870-5-104


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Does anybody know if the PSI system expects TESTFR telegrams within a non idle connection?

I'm talking to a gateway like this: https://www.psinentec.de/fileadmin/_migrated/content_uploads/FG_3G-TIG_Produktblatt.pdf

The IEC 60870-5-104 spec says that the TESTFR message should only be send if the connection is idle. The TIG on the other hand closes the connection. I suspect the reason for that is, that I don't send any TESTFR messages (there is data traffic, so no reason for that). On a second TIG there is no traffic, and thus the TESTFR message is sent, and the connection stays on.

Can anybody confirm this behavior? Is my conclusion correct?