code: public byte[] sendOutbind(OutputStream os, int sequenceNumber, String systemId, String password)
          throws PDUStringException, IOException
      {
          byte[] b = this.pduComposer.outbind( sequenceNumber,systemId, password);
          writeAndFlush(os, b);
          return b;
      }
docs: /*
  (non-Javadoc)
  
  @see org.jsmpp.PDUSender#sendOutbind(java.io.OutputStream,
  int, java.lang.String, java.lang.String)