uint8_t buffer[11] = "I send this";

NSInteger nwritten = [outputStream write:buffer maxLength:sizeof(buffer)];

if (-1 == nwritten) {
    NSLog(@"Error writing to stream %@: %@", outputStream, [outputStream streamError]);
}else{
    NSLog(@"Wrote %i bytes to stream %@.", nwritten, outputStream);
}

connection = new Socket(Constants.HOST, Constants.CHAT_LISTENER_PORT);
_in = new DataInputStream(connection.getInputStream());
String data = _in.readUTF();

DataInputStream.readUTF();

NSString *msg = @"initChat_";
NSString *messageToSend  = [NSString stringWithFormat:@"%@", msg];
NSData *data = [self convertToJavaUTF8:messageToSend];

int dataLenght = [data length];

int num = [outputStream write:(const uint8_t *)[data bytes] maxLength:dataLenght];


if (-1 == num) {
    NSLog(@"Error writing to stream %@: %@", outputStream, [outputStream streamError]);
}else{
    NSLog(@"Wrote %i bytes to stream %@.", num, outputStream);
}

- (NSData*) convertToJavaUTF8 : (NSString*) str {
NSUInteger len = [str lengthOfBytesUsingEncoding:NSUTF8StringEncoding];
Byte buffer[2];
buffer[0] = (0xff & (len >> 8));
buffer[1] = (0xff & len);
NSMutableData *outData = [NSMutableData dataWithCapacity:2];
[outData appendBytes:buffer length:2];
[outData appendData:[str dataUsingEncoding:NSUTF8StringEncoding]];
return outData;}

func javaUTF8() -> Data? {
        guard let data = self.data(using: .utf8) else {
            return nil
        }
        let length = self.lengthOfBytes(using: .utf8)
        var buffer = [UInt8]()
        buffer.append(UInt8(0xff & (length >> 8)))
        buffer.append(UInt8(0xff & length))
        var outdata = Data()
        outdata.append(buffer, count: buffer.count)
        outdata.append(data)
        return outdata
    }