One of the most important parts of remediating the core deficits of ASD is to allow periods of silence (or enforce silence if need be). If we want ASD children and teens to communicate we must all agree that one-way, chatter, is not meaningful communication.
So, take an hour break every day from talking/chatting/yapping. Let there be silence. During this period use only non-verbal communication.
If your child/teen insists on talking, explain that it is quiet time usimng non-verbals -- shake your head, frown, etc.
If your child/teen pursues you, walk away and close the door.
For every hour you spend in quiet connection with your ASD child/teen you are one hour closer to mindfull communication.
First there is have quiet. Then there is non-verbal communication. Then we have a child/teen who begins to understand that communication is about building bridges, reaching out, not down loading info.