rsync protocol description

[Christoph Bartelmus]

Hello,

I'm currently evaluating the possibility of implementing a rsync client
in a project for my company. The platform used is currently not
supported and implementing the client from scratch currently seems to be
the most feasible approach.
For that I'd be very much interested in a description of the protocol
that rsync talks on port 873. Is such a description available somewhere?
I don't want to have to deduce the protocol from the source code.

What I have found so far are the description of the algorithms (rsync
technical report and Andrew Tridgell's PhD thesis). Have I overlooked
something obvious?

Cheers,

Christoph