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There have been dozens, called anything from Message+ to Joyn. Most seem to be shutting down, though, because nobody used RCS since its inception from somewhere
by jeroenhd 2y ago
There have been dozens, called anything from Message+ to Joyn. Most seem to be shutting down, though, because nobody used RCS since its inception from somewhere around 2009 and renewed interest in launching RCS services around 2012.
There are a few implementations on Github. https://github.com/android-rcs/rcsjta https://github.com/android-rcs/rcsjta seems to be the most complete but uses an older version of the spec. https://github.com/Hirohumi/rust-rcs-client https://github.com/Hirohumi/rust-rcs-client is a modern implementation.
The spec is here: https://www.gsma.com/solutions-and-impact/technologies/networks/gsma_resources/rich-communication-suite-advanced-communications-services-and-client-specification-version-14-0/ https://www.gsma.com/solutions-and-impact/technologies/netwo... if you're looking to implement it yourself.