examples/components/routing/meta/echo_realm.cml

// Example realm that provisions an Echo client and service and eagerly runs the client.
{
    // Two children: a server and client.
    children: [
        {
            name: "echo_server",
            url: "#meta/echo_server.cm",
        },
        {
            name: "echo_client",
            url: "#meta/echo_client.cm",
        },
    ],

    // Route Echo service from server to client.
    offer: [
        {
            protocol: "fidl.examples.routing.echo.Echo",
            from: "#echo_server",
            to: "#echo_client",
        },
        {
            protocol: "fuchsia.logger.LogSink",
            from: "parent",
            to: [
                "#echo_client",
                "#echo_server",
            ],
        },
    ],
}