Restaurant Windows POS Software: High-Speed Rust Runtimes & Sub-80ms Thermal Printing

// High-Speed Direct Raw TCP Socket Stream to Network ESC/POS Thermal Printers
// Bypasses the bloated Windows Print Spooler to guarantee sub-80ms ticket prints
use std::net::TcpStream;
use std::io::Write;
use std::time::Duration;

pub fn dispatch_kitchen_order_ticket(
    printer_ip: &str, 
    table_id: &str, 
    items: &[(&str, u32)]
) -> Result<(), Box<dyn std::error::Error>> {
    let stream_addr = format!("{}:9100", printer_ip);
    let mut stream = TcpStream::connect_timeout(
        &stream_addr.parse()?, 
        Duration::from_millis(450)
    )?;

    // ESC/POS Initialization Byte Sequence
    let mut payload: Vec<u8> = vec![0x1B, 0x40]; // Initialize printer
    payload.extend_from_slice(&[0x1B, 0x21, 0x30]); // Double-height bold text
    payload.extend_from_slice(format!("KOT - TABLE {}

", table_id).as_bytes());

    payload.extend_from_slice(&[0x1B, 0x21, 0x00]); // Reset to normal font
    for (item, qty) in items {
        payload.extend_from_slice(format!("{}x {}
", qty, item).as_bytes());
    }

    // Paper Cut Sequence
    payload.extend_from_slice(&[0x1D, 0x56, 0x41, 0x03]); // Partial paper cut
    stream.write_all(&payload)?;
    stream.flush()?;

    Ok(())
}