code: public byte[] outbind(int sequenceNumber, String systemId, String password)
              throws PDUStringException {
          StringValidator.validateString(systemId, StringParameter.SYSTEM_ID);
          StringValidator.validateString(password, StringParameter.PASSWORD);
  
          PDUByteBuffer buf = new PDUByteBuffer(SMPPConstant.CID_OUTBIND, 0,
                  sequenceNumber);
          buf.append(systemId);
          buf.append(password);
          return buf.toBytes();
      }
docs: /*
  (non-Javadoc)
  
  @see org.jsmpp.util.PDUComposer#outbind(int, java.lang.String,
  java.lang.String)