Delay time exceeds maximum for 1ms if rand() has max value

[MartinMelikMerkumians]

In the DetermineDelayTime function +1 is added to the randomized delay time. This is wrong for two reasons. First the Spec states that the delay time shall be between 0 and the max delay time, and second if the max delay time is the result of the randomization process, the allocated delay time will be 1ms larger than the allowed delay time.

[MartinMelikMerkumians]

In addition the if condition if the delay time has been reached is also off by +1, as it checks against greater or equal than 0, but if the time has reached 0 the delay has already be fulfilled. So the correct condition is greater than 0 for stalling, otherwise send the message.