Encryption: Mobilink 12 syncing to Mobilink 16

I have a situation where we are trying to upgrade to SQL Anywhere 16 to get the benefits of the TLS 1.1 encryption protocol.

The man calling the shots doesn't want to upgrade all of the client databases to SQLA 12, though.  Just the Consolidated database, where the MobiLink server is.

So what would happen if someone using MobiLink 12 syncs to a MobiLink 16 service connected to a SQLA 16 database?  Is this even possible?  And if so, would the synchronization use TLS 1.0 or TLS 1.1?

Thanks in advance!

Guy