Get broadcast ip from ip and gateway in Arduino

Using Arduino Programming Questions
1

Is there a way to get the broadcast ip from ip and subnet in Arduino?
I know if the system has an ip of 192.168.0.2 and subnet of 255.255.255.0, then 192.168.0.255 is its broadcast ip.
But how do I get it programmatically in Arduino, without any kind of hardcoding?

I need this because, I need the Arduino's to report its presence in the network, so that its controller can detect them and control them. The controller will not be a specific machine. It could be an Android app, and whoever has the app installed should be able to identify the Arduino and control it.

Once broadcast ip is known, I can transmit periodic pings over udp, and have the controllers detect them.

2

If you invert the subnet and OR that with the ip address you should normally end up with the broadcast address iirc.

4

simply use 255.255.255.255 to broadcast in the same network. you would use network address if you want to broadcast in a specific network

5

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