Send byte[] without a Cloud service

Hi,

I´m getting camera frames and I am able to convert them to an array of bytes. Now I want to send them to another application in a way that is not a direct client/server communication (for example something like publisher/subscriber). Some suggestions? I´ve tried Pubnub but I´m wondering if there are some alternatives, or if it is possible to simulate something like PubNub but without using the Cloud.