Alert message function

[Domoticatorino]

Dear All,
I would like to write an alert everytime temperature is >= a setpoint.

I can use event base script or resident script but in both case alert message will appear everytime the temperature change or every base time set as resident script.

I would like to log alert only when temperature surpasses set point for the first time and not going on to send alert message. If temperature remains above set point for 1 day alert must be only 1.

What do you suggest?

Thanks.