Channel-Based Unidirectional Stream Protocol (CUSP)

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This paper presents a novel transport protocol, CUSP, specifically designed with complex and dynamic network applications in mind. Peer-To-Peer applications benefit in particular, as their requirements are met by neither UDP nor TCP. While other modern transports like SCTP or SST have also tried to combine the advantages of TCP and UDP, CUSP overcomes their technical and conceptual shortcomings. CUSP makes it possible to directly express application logic in the message flow. Modern applications need a mixture of request-response, request-multiple-response, publish-subscribe, and message-passing.