是否可以通过应用程序控制WiFi上的其他单位

In my school we have this task that we have to build an online "product", not to actually code the product, but just describe it very well. We are "making" an app, and therefor I would like to hear if you know. If we imagine to iPhones connected to the same Wifi, is it possible to make an app there can get a list of units connected to the wifi, then choose the unit, and then send signals to that unit? I hope you understand what I mean.In my school we have this task that we have to