Informing many clients via wireless


I am planning a system that contains one main sensor that will trigger an event if something physical is happening.
The event supposed to be sent to many receivers (wireless communication) that placed in different room in the house and each receiver will close a relay for a short time and then waiting for the next event.

I need help in the communication protocol here:
I was thinking going to the ESP-8266 and making a local WiFi network. The main sensor will be act as access point and the receiver will be clients that periodically ask if they need to close the relay.
What do you think?


I would use one of the many simple, cheap Arduino compatible transceivers, like NRF24L01.