ESP8266 Community Forum

Hello,
At firts, I explain my proyect:
I have a server and several clients with diferent IPs.
Each client has a temperatura sensor and send every second.
The server lisen and receive this information from all clients.
My problem is: I want to now witch send.
With de function "Udp.remoteIP()" I can do "Serial.print(Udp.remoteIP())" (for explample 192.168.4.10). But, how to extract the number 10?
I try:
IPAddress IP_Cliente_10 = (192, 168, 4, 10);
IP_Cliente = Udp.remoteIP();
if (IP_Cliente_10 == IP_Cliente) ........

But don't work.
Any idea?

Howdy Paco,
The UDP.remoteIP method returns an instance of an IPAddress class. This class has an operator override for array indexing.

For example ...

IPAddress myIP = udp.remoteIP();

then myIP[0] will be the first byte of the IP address and myIP[3] will be the last byte of the IP address. So if all you want is the last byte of the address, myIP[3] should do the trick.

Neil

There is an "equal" operator in IPAddress.
so, you can do

IPAddress IP_Cliente_10 = IPAddress(192, 168, 4, 10);

IP_Cliente = Udp.remoteIP();
if (IP_Cliente_10 == IP_Cliente) { ... }

Note the bold part missing in your code ...

Thanks a lot! I've lost hours trying.