Is it possible to transfer files using Msgpack RPC [python and ruby]?

[Stephen Murdoch]

I'm trying to figure out how I would transfer a .pem file from one server to another using Msgpack RPC. I've got the msgpack-rpc ruby gem on one machine, and the msgpack-rpc-python python module on the other. 

The two machine talk to one another and I have everything set up right. I just can't figure out how to put a whole file on the wire and have it transfer over intact..