You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ethernet_w5500_tcp_server.rs
    path of file: ./repos/embassy/examples/rp/src/bin
    
    the code of the file until where you have to start completion: //! This example implements a TCP echo server on port 1234 and using DHCP.
//! Send it some data, you should see it echoed back and printed in the console.
//!
    
async fn wait_for_config(stack: &'static Stack<Device<'static>>) -> embassy_net::StaticConfigV4 {
    loop {
        if let Some(config) = stack.config_v4() {
            return config.clone();
        }
        yield_now().await;
    }
}