private void sleep(long ms) {
        try {
            Thread.sleep(ms);
        } catch (InterruptedException ex) {
            throw new RuntimeException(ex);
        }
    }
Provides a simulator that receives connection over TCP as per a real APNS server.  This class allows verification
and prior configuration of responses in a manner similar to a mocking framework.
src/test/java/com/notnoop/apns/utils/Simulator/ApnsSimulatorWithVerification.java