MacroDroid was the simplest way to use:
1. create a Trigger with Webhook (Url) and name it ex: vibrate
2. create an Action with Vibrate.
3. wait a bit then use the URL in the browser:

https://trigger.macrodroid.com/9dcba13f-aa8e-4054-b6a0-a432eda91879/vibrate
https://trigger.macrodroid.com/9dcba13f-aa8e-4054-b6a0-a432eda91879/vibrate2
https://trigger.macrodroid.com/9dcba13f-aa8e-4054-b6a0-a432eda91879/vibrate3
https://trigger.macrodroid.com/9dcba13f-aa8e-4054-b6a0-a432eda91879/vibrate4
https://trigger.macrodroid.com/9dcba13f-aa8e-4054-b6a0-a432eda91879/vibrate5

 
Note: url ends with the name of the webhook