安全でないマシンツーマシン通信の設定

class MyThread(private val mmInStream: InputStream, private val handler: Handler) : Thread() {

    private val mmBuffer = ByteArray(1024)
      override fun run() {
        while (true) {
            try {
                val numBytes = mmInStream.read(mmBuffer)
                if (numBytes > 0) {
                    val data = mmBuffer.copyOf(numBytes)
                    if (isValidBinaryData(data)) {
                        val readMsg = handler.obtainMessage(
                            MessageConstants.MESSAGE_READ, numBytes, -1, data
                        )
                        readMsg.sendToTarget()
                    } else {
                        Log.w(TAG, "Invalid data received: $data")
                    }
                }
            } catch (e: IOException) {
                Log.d(TAG, "Input stream was disconnected", e)
                break
            }
        }
    }

    private fun isValidBinaryData(data: ByteArray): Boolean {
        if (// Implement data validation rules here) {
            return false
        } else {
            // Data is in the expected format
            return true
        }
    }
}

public void run() {
            mmBuffer = new byte[1024];
            int numBytes; // bytes returned from read()
            // Keep listening to the InputStream until an exception occurs.
            while (true) {
                try {
                    // Read from the InputStream.
                    numBytes = mmInStream.read(mmBuffer);
                    if (numBytes > 0) {
                        // Handle raw data directly
                        byte[] data = Arrays.copyOf(mmBuffer, numBytes);
                        // Validate the data before sending it to the UI activity
                        if (isValidBinaryData(data)) {
                            // Data is valid, send it to the UI activity
                            Message readMsg = handler.obtainMessage(
                                    MessageConstants.MESSAGE_READ, numBytes, -1,
                                    data);
                            readMsg.sendToTarget();
                        } else {
                            // Data is invalid
                            Log.w(TAG, "Invalid data received: " + data);
                        }
                    }
                } catch (IOException e) {
                    Log.d(TAG, "Input stream was disconnected", e);
                    break;
                }
            }
        }

        private boolean isValidBinaryData(byte[] data) {
            if (// Implement data validation rules here) {
                return false;
            } else {
                // Data is in the expected format
                return true;
           }
    }

fun performBulkTransfer() {
    // Stores data received from a device to the host in a buffer
    val bytesTransferred = connection.bulkTransfer(endpointIn, buffer, buffer.size, 5000)

    if (bytesTransferred > 0) {
        if (//Checks against buffer content) {
            processValidData(buffer)
        } else {
            handleInvalidData()
        }
    } else {
        handleTransferError()
    }
}

public void performBulkTransfer() {
        //Stores data received from a device to the host in a buffer
        int bytesTransferred = connection.bulkTransfer(endpointIn, buffer, buffer.length, 5000);
        if (bytesTransferred > 0) {
            if (//Checks against buffer content) {
                processValidData(buffer);
            } else {
                handleInvalidData();
            }
        } else {
            handleTransferError();
        }
    }

//The method takes as input an element from the received NDEF messages array
fun isValidNDEFMessage(messages: Array<NdefMessage>, index: Int): Boolean {
    // Checks if the index is out of bounds
    if (index < 0 || index >= messages.size) {
        return false
    }
    val ndefMessage = messages[index]
    // Retrieves the record from the NDEF message
    for (record in ndefMessage.records) {
        // Checks if the TNF is TNF_ABSOLUTE_URI (0x03), if the Length Type is 1
        if (record.tnf == NdefRecord.TNF_ABSOLUTE_URI && record.type.size == 1) {
            // Loads payload in a byte array
            val payload = record.payload

            // Declares the Magic Number that should be matched inside the payload
            val gifMagicNumber = byteArrayOf(0x47, 0x49, 0x46, 0x38, 0x39, 0x61) // GIF89a

            // Checks the Payload for the Magic Number
            for (i in gifMagicNumber.indices) {
                if (payload[i] != gifMagicNumber[i]) {
                    return false
                }
            }
            // Checks that the Payload length is, at least, the length of the Magic Number + The Descriptor
            if (payload.size == 13) {
                return true
            }
        }
    }
    return false
}

//The method takes as input an element from the received NDEF messages array
    public boolean isValidNDEFMessage(NdefMessage[] messages, int index) {
        //Checks if the index is out of bounds
        if (index < 0 || index >= messages.length) {
            return false;
        }
        NdefMessage ndefMessage = messages[index];
        //Retrieve the record from the NDEF message
        for (NdefRecord record : ndefMessage.getRecords()) {
            //Check if the TNF is TNF_ABSOLUTE_URI (0x03), if the Length Type is 1
            if ((record.getTnf() == NdefRecord.TNF_ABSOLUTE_URI) && (record.getType().length == 1)) {
                //Loads payload in a byte array
                byte[] payload = record.getPayload();
                //Declares the Magic Number that should be matched inside the payload
                byte[] gifMagicNumber = {0x47, 0x49, 0x46, 0x38, 0x39, 0x61}; // GIF89a
                //Checks the Payload for the Magic Number
                for (int i = 0; i < gifMagicNumber.length; i++) {
                    if (payload[i] != gifMagicNumber[i]) {
                        return false;
                    }
                }
                //Checks that the Payload length is, at least, the length of the Magic Number + The Descriptor
                if (payload.length == 13) {
                    return true;
                }
            }
        }
        return false;
    }