How to test vibration with Connect IQ device simulator?

You have code in your app that uses "Attention".  You set up a vibe profile and then run it:

var vibp=[ new Attention.VibeProfile(100, 800 )];
Attention.vibrate(vibp);

What happens is the simulator "shakes".

Great! Thanks! if I have it included in onUpdate() it shakes only once at the first appearance of the simulator, doesn't it have to cycle or update each 5 seconds and vibrate accordingly?

How often is onUpdate being called?  You can't use this in a WF, so it's got to be a widget or device app, and there you control when onUpdate is called.

and how is this handled in the simulator environment? How often is onUpdate being called?

For a widget or device app, with no calls to WatchUi.requestUpdate(), onUpdate is called once.

It's not like a watch face where onUpdate is called on a regular basis.

How to vibrate n- times in a row?

A common way to do this in a widget or device app is to use a time:

Create the timer and start it in initialize (this is a 1 second timer)

var timer= new Timer.Timer();
timer.start( method(:onTimer), 1000, true );

With onTimer being:

    function onTimer() { WatchUi.requestUpdate();}

Look at VibeProfile, where the profile itself might do it.

Ir using a timer as I posted elsewhere.  (do it the next 10 times onUpdate is called()?)

 I use Time.now().value(); and calculate a difference between initial (onStart) and actual (onUpdate), which works fine as debugging values show

I also call Toybox.Attention, but no reaction on my Venue SQ, what's wrong?

var vibp1=[ new Attention.VibeProfile(50, 1000)];

var vibp2=
[ new Attention.VibeProfile(50, 1000),
new Attention.VibeProfile(0, 1000),
new Attention.VibeProfile(100, 1000),
];

if (diffsec == 60) {
Attention.vibrate(vibp1);
}

if (diffsec == 120) {
Attention.vibrate(vibp2);
}

Could it relate to the onUpdate frequency?... e.g. Update Is on second 80, 140,200, which in this case would not trigger a vibration if e.g. second 120 is not caught

As I've said the easiest way to regularly get onUpdate() called is to start a timer.

At the beginning of your onUpdate function add

System.println("onUpdate called");

You'll see a line in the console each time onUpdate is called.