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I need help in my project, where I want to catch, read and forward some packets given to another application. Example: some packets is incoming for application MyApp on port 888. The another application is running on background and listening for communication with MyApp. If the server sends packet I need to catch it before it comes to MyApp and if data inside will include some special code, like "....server_echo" I need to destroy it. But if there isn't any special code, I need to forward it to MyApp.
It looks like a firewall application.
Thank you :-/

Set your app to listen to
Your filter then connects to and itself listens on port 888 of the machine itself.
Your filter now sees all the traffic on that port, and can forward/modify/drop as necessary.