Support Zlib compression with STARTTLS encryption

HI
does Zlib stream compression work with starttls or one of them can be used at the same time by a client in ejabberd?
how to enable it in ejabberd 15.11?
Is smack compatible with ejabberd zlib?

For example, the Tkabber

For example, the Tkabber client supports STARTTLS, and also Zlib. But by design it isn't possible to enable both at the same time, you use one or the other. I guess other clients behave similarly.

So, I can't test if both work at the same time in ejabberd.

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