Multicast Questions

I got multiple processes listening on the same port subscribed to a multicast address. packets to this address reach every process. however, when

I cannot listen to messages being broadcast on 255.255.255.255. the

I could not find a working example for this, so i am going to post a question (and let's see if i can reduce this to an mvp code example). so, i

I am wondering for the udp multicast to work, router must support it?