good RPC framework for D?

[Timothee Cour via Digitalmars-d]

Is there a good RPC framework for D?

requirements:
* efficient (no json/xml)
* supports at least sending/receiving raw bytes

I tried msgpack-rpc but it seems abandonned (last commit 2 y ago) and
this issue makes it unusable:
https://github.com/msgpack-rpc/msgpack-rpc-d/issues/16 for messages of
length >= 4090 bytes.

I would love to have a GRPC work with D but couldn't find a package for it.

Is there at least a reliable solution that sends raw bytes ? than I
can for eg wrap protobufs or other serialized formats via
serialization/deserialization.

Additional requirements: supports streaming data (either input or
output or both), and timeouts.