Communication rebuild.

communication/src/main/java/cn/rrg/bulkio/BulkOutputStream.java

@@ -0,0 +1,48 @@
+package cn.rrg.bulkio;
+
+import android.hardware.usb.UsbDeviceConnection;
+import android.hardware.usb.UsbEndpoint;
+
+import androidx.annotation.NonNull;
+
+import java.io.IOException;
+import java.io.OutputStream;
+
+public class BulkOutputStream extends OutputStream {
+    private int timeout;
+    private UsbDeviceConnection connection;
+    private UsbEndpoint endpoint;
+
+    public BulkOutputStream(UsbDeviceConnection connection, UsbEndpoint endpoint) {
+        this.connection = connection;
+        this.endpoint = endpoint;
+    }
+
+    public int getTimeout() {
+        return timeout;
+    }
+
+    public void setTimeout(int timeout) {
+        this.timeout = timeout;
+    }
+
+    @Override
+    public void write(int b) throws IOException {
+        connection.bulkTransfer(endpoint, new byte[]{(byte) b}, 0, 1, timeout);
+    }
+
+    @Override
+    public void write(@NonNull byte[] b, int off, int len) throws IOException {
+        connection.bulkTransfer(endpoint, b, off, len, timeout);
+    }
+
+    @Override
+    public void write(@NonNull byte[] b) throws IOException {
+        connection.bulkTransfer(endpoint, b, 0, b.length, timeout);
+    }
+
+    @Override
+    public void close() throws IOException {
+        connection.close();
+    }
+}