Function bytes_to_read 

pub fn bytes_to_read<R: Runtime>(
    _app: AppHandle<R>,
    serial: State<'_, SerialPort<R>>,
    path: String,
) -> Result<u32, Error>

Gets the number of bytes available to read from the serial port

Returns the number of bytes that are currently available in the input buffer and ready to be read.

Arguments

• _app - The Tauri app handle
• serial - The serial port state
• path - The path to the serial port (e.g., “COM1”, “/dev/ttyUSB0”)

Returns

The number of bytes available to read, or an Error if it failed.

Example

use tauri_plugin_serialplugin::commands::bytes_to_read;
use tauri::{AppHandle, State};
 
#[tauri::command]
async fn check_available_data(
    app: AppHandle<tauri::Wry>,
    serial: State<'_, tauri_plugin_serialplugin::desktop_api::SerialPort<tauri::Wry>>
) -> Result<(), String> {
    let available = bytes_to_read(app, serial, "COM1".to_string())
        .map_err(|e| e.to_string())?;
    println!("{} bytes available to read", available);
    Ok(())
}

JavaScript Equivalent

import { SerialPort } from "tauri-plugin-serialplugin-api";;
 
const port = new SerialPort({ path: "COM1" });
await port.open();
const available = await port.bytesToRead();
console.log(`${available} bytes available to read`);