let mut server = UrpcServer::new(SRV_ADDR); 
server.register("donut-service", DonutService::new()); 
UrpcServer::start(server);

// Define the list of recipient nodes and instantiate the client
let recipients = vec![DONUT_ADDR];
let client = UrpcClient::new(recipients);


// Let's build the request
let request = DonutRequest {
  quantity: 3,
  type: "chocolate",
}

// The client encodes the request payload and sends to each recipient.
// Delivery is not guaranteed.
client.send("donut-service", "order", request);