senddata to arduino

package id.unej.demoarduinosm

import android.hardware.usb.UsbManager
import android.os.Bundle
import android.util.Log
import androidx.appcompat.app.AppCompatActivity
import com.hoho.android.usbserial.driver.UsbSerialDriver
import com.hoho.android.usbserial.driver.UsbSerialPort
import com.hoho.android.usbserial.driver.UsbSerialProber
import id.unej.demoarduinosm.databinding.ActivityDemoBinding
import java.io.IOException


class DemoActivity : AppCompatActivity() {
    private lateinit var binding: ActivityDemoBinding

    private lateinit var usbManager: UsbManager
    private var usbSerialPort: UsbSerialPort? = null

    companion object {
        private const val TAG = "SAPI"
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        binding = ActivityDemoBinding.inflate(layoutInflater)
        setContentView(binding.root)

        usbManager = getSystemService(USB_SERVICE) as UsbManager
        // Tombol untuk mengirim data
        binding.buttonArdu.setOnClickListener {
            sendDataAndReadResponse("A")
        }
    }

    private fun sendDataAndReadResponse(data: String) {
        // Mencari driver USB serial yang terhubung
        val availableDrivers: List<UsbSerialDriver> = UsbSerialProber.getDefaultProber().findAllDrivers(usbManager)

        if (availableDrivers.isEmpty()) {
            Log.e(TAG, "No USB serial device found.")
            return
        }

        // Ambil driver pertama (misalnya, driver untuk Arduino)
        val driver: UsbSerialDriver = availableDrivers[0]
        val connection = usbManager.openDevice(driver.device)

        if (connection == null) {
            Log.e(TAG, "Unable to open device.")
            return
        }

        usbSerialPort = driver.ports[0]  // Ambil port pertama dari driver

        try {
            // Set koneksi serial
            usbSerialPort?.open(connection)
            usbSerialPort?.setParameters(115200, 8, UsbSerialPort.STOPBITS_1, UsbSerialPort.PARITY_NONE)

        } catch (e: IOException) {
            Log.e(TAG, "Error with USB serial connection", e)
        }

        if (usbSerialPort == null) {
            Log.e(TAG, "USB serial port is not initialized.")
            return
        }

        try {
            // Kirim data ke Arduino
            val dataToSend = data.toByteArray()
            usbSerialPort?.write(dataToSend, 1000)

            // Baca respons dari Arduino
            val buffer = ByteArray(1024)
            val bytesRead = usbSerialPort?.read(buffer, 1000)


            Log.e(TAG, "sendDataAndReadResponse: $bytesRead", )

            if (bytesRead != null && bytesRead > 0) {

                val response = String(buffer, 0, bytesRead)
                Log.d(TAG, "Response from Arduino: $response")

                binding.tvResult.append("\n$response")
            } else {
                Log.e(TAG, "No response received.")
            }
        } catch (e: IOException) {
            Log.e(TAG, "Error during communication", e)
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        try {
            usbSerialPort?.close()
        } catch (e: IOException) {
            Log.e(TAG, "Error closing USB serial port", e)
        }
    }
}