try {
// NOTE: send enquireLink but receive an unbind resp (with same sequence #)
EnquireLink el0 = new EnquireLink();
el0.setSequenceNumber(0x1000);
UnbindResp ubResp = new UnbindResp();
ubResp.setSequenceNumber(el0.getSequenceNumber());
// schedule this response on the simulator
simulator0.addPduToWriteOnNextPduReceived(ubResp);
// send asynchronously (no response will be received yet)