Triggering an Event Signal

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I am trying to simulate CAN communication on a bus to a realtime system and I have two main aims for my model.

1. To be able to send a singular packet of data by triggering it with out any new packet being sent again until the next interval. As my model may be running at a faster sampling time I don't want the signal being sent continually till the next trigger signal

2. To be able to trigger the event with a particular period but with added randomness.

For example if I want the signals to be sent every 5 seconds +/- 10 % then the block I'm using will trigger of intervals of 4.5-5.5 seconds randomly

Here is my attempt as you can see both signals hold the scope at what was the last trigger in intervals