title: Send notification to all the devices connected to a Wi-Fi network
body: <p>Is there any way to send a notification to the devices which are connected to a particular Wi-Fi network?</p>
  
  <p>Say, I have a Wi-Fi network named "My Wi-Fi", which is not secured, that is any one can connect. A public network.</p>
  
  <p>There may be N-number of users connected to "My Wi-Fi". These users can perform any kind of transaction, say online payment. </p>
  
  <p>Now if I want to turn off or shut down "My Wi-Fi" router or access point, these transactions may fail.</p>
  
  <p>So before shutting down, I want to send a text notification to all the users connected to "My Wi-Fi" network. (User does not have any kind of app in their device, to push the notification.)</p>
  
  <p>Is this possible?</p>