Capture Bluetooth communication in Java -

i have small device works bluetooth , want capture command launched device use them on computer, anyway tried use bluecove library

but receive chars, , when try launch commands device, inputstream doesn't receive anything

public void run() {     try {         // prepare receive data         datainputstream inputstream   = new datainputstream(mconnection.openinputstream());         system.out.println("waiting input");          while (true) {             int command = inputstream.read(new byte[8]);             //int donnee = inputstream.read() ;              if (command == exit_cmd) {               system.out.println("finish process");                 break;             }             processcommand(command);            }      } catch (exception e) {         e.printstacktrace();     }