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public void write(byte[] bytesToSend) {
        // System.out.println("Write begin.");
        try {
            socket.setSoTimeout(10000);
            packageID = 0;
            // Add bytes to send
            saveBytesToPackeges(bytesToSend);
            // Begin new Thread to be sure it was delivered
            mySendChecker = new SendChecker();
            Thread myThread = new Thread(mySendChecker);
            myThread.start();
            byte[] buf2 = new byte[50];
            // Sending number of packeges
            byte[] buf = bytesFromInt(numberOfPackages);
            for (int i = 0; i < 4; i++) {
                buf2[i] = buf[i];
                
            }
            packageID = -2;
            buf = packetFromBytes(buf2, sizeOfPackage - 4);
            DatagramPacket myPacket = new DatagramPacket(buf, buf.length,
                    addressToSendTo, portToSendTo);
            socket.send(myPacket);
            mySendChecker.setPacket(-2, myPacket);
            // recieve answer
            socket.receive(myPacket);
            buf = myPacket.getData();
              mySendChecker.removePacket(-2);
            // send delieverer
            buf = packetFromBytes(buf2, sizeOfPackage - 4);
            socket.send(myPacket);
            // starting to send data
            for (int i = 0; i < numberOfPackages; i++) {
                myPacket = new DatagramPacket(bytesToSendSave[i],
                        bytesToSendSave[i].length, addressToSendTo,
                        portToSendTo);
                socket.send(myPacket);
                mySendChecker.setPacket(i, myPacket);
            }
            // start to recieve answers
            int numberOfPackegeRecieved = 0;
            while (true) {
                buf = new byte[8];
                if (mySendChecker.isEmpty()) {
                    break;
                    
                }
                myPacket = new DatagramPacket(buf, buf.length);
                socket.receive(myPacket);
                buf = myPacket.getData();
                numberOfPackegeRecieved = intFromBytes(buf, 4);
                if (-3 != intFromBytes(buf, 4)) {
                    continue;
                    
                }
                numberOfPackegeRecieved = intFromBytes(buf, 0);
                mySendChecker.removePacket(numberOfPackegeRecieved);
                myPacket = new DatagramPacket(buf, buf.length, addressToSendTo,
                        portToSendTo);
                socket.send(myPacket);
            }
            buf = bytesFromInt(-5);
            myPacket = new DatagramPacket(buf, buf.length, addressToSendTo,
                    portToSendTo);
            socket.send(myPacket);
            mySendChecker.setPacket(-5, myPacket);
            // System.out.println("WRITE Sending -5");
            while (true) {
                buf = new byte[4];
                myPacket = new DatagramPacket(buf, buf.length);
                socket.receive(myPacket);
                buf = myPacket.getData();
                if (-5 == intFromBytes(buf, 0)) {
                    // System.out.println("WRITE recieved -5");
                    break;
                }
            }
            mySendChecker.end();
            
            socket.setSoTimeout(100);
            while (true) {
                try {
                    socket.receive(myPacket);
                } catch (SocketTimeoutException e) {
                    break;
                }
            }
            socket.setSoTimeout(0);
            // System.out.println("Write end.");
            ... TO BE CONTINUED ...