Hi @Célio Garcia, you cannot force the clients to use a low bandwidth, unless you have control over the software or App that they use; e.g. if you develop your own App that sends a stream to the server, then you can limit the upload bandwidth.
What you can do, is develop a custom plug-in for Wowza Streaming Engine where you disconnect the user if he sends with a high bitrate. It’s maybe rude, but I think it’s the only option.