I am looking for a device or devices which can send a notification to an app when a heater is switched on ... there are 25 heaters ... 3 motors and a light.

I want to fit a relay 230 volt relay (all the devices are 230 v) so when the coil/light/heater for example is energised ... a relay must switch a device and display the status of the coil/light/heater on an app.