Allow connection between Peers even if one is sending an empty or no stream object

Currently my connection between peers only work if for instance both send the same type of stream (e.g. video). In a case scenario in which a main user wants to broadcast its video to others, you don't want the others to have to send video back, at least you would want to be able to return an empty stream to not saturate the bandwidth with unnecessary data.
Maybe you can already do this somehow, but at least in my case it didn't work with any of the ways I tried.
Thank you!