Here is my thought : When I'm not at home, I send a specific string to an online system, then Domoticz pull every 5 minutes this system to check if the string is there. If this is the case, execute a command on Domoticz.
But, I have to be able to remove the string once he has been pulled, otherwise this will be a loop. It's need for my new project about online casinos for real money - here is the link to it https://casinos-advisor.com/
So, how do you manage things like this ? Do you know if something dedicated for this exist ? All advices are welcome !

Thanks for your feedback !