RSocket is a protocol for multiplexed streams. It's comparable to gRPC in terms of interaction models, but unlike gRPC it is transport independent (TCP, WebSockte, HTTP/2, Aeron) and supports Reactive Streams back pressure at the protocol level, among others. It does provide multi-language support but does not depend on generation.
The rsocket-java project is built on Reactor Netty and Reactor Core, so the programming model and technology stack is closely aligned with WebFlux.
This ticket is to provide RSocket support for Spring applications.