how to broadcast a notification to everyone on the same wifi without a download

[jonesty07]

I need help because I need to know if I can write and send a notification to everyone on my wifi to say "hi wifi of in 20 mins" so it says it to androind and stuff

 

[kanewolf]

Not without having the same software on all devices. A message is a very high level transaction for a network (WIFI). It would require application software on both the sending and receiving side of the network.

 

[bill001g]

Very technically you can just send a packet to the broadcast ip or mac address. It will be forwarded to all the end devices. That is actually the easy part the hard part is the end devices by default pretty much just discard this data. You would need something on each type of platform installed that would accept these messages.

 

[USAFRet]

Since everyone is on the same WiFi, they would presumably be physically rather close?
Just yell really loud.

The guy mooching off you with a cantenna from 1/4 mile away is just out of luck for the notification.