@Override
    public String toString() {
        if (command != null) {
            return "SmppMessage: " + command;
        } else {
            return "SmppMessage: " + getBody();
        }
    }
@Test
    public void toStringShouldReturnTheShortMessageIfTheCommandIsNotNull() {
        DeliverSm command = new DeliverSm();
        command.setShortMessage("Hello SMPP world!".getBytes());
        message = new SmppMessage(camelContext, command, new SmppConfiguration());

        assertEquals("SmppMessage: PDUHeader(0, 00000000, 00000000, 0)", message.toString());
    }