Return? how does this work?

Hello!

I am using the Ethernet.maintain function in my sketch and on the page (http://arduino.cc/en/Reference/EthernetMaintain) it says it returns a byte explaining what the result of the attempt to maintain the IP address was. How do i check what the result was? Can i print that byte to Serial or something? How?

Reading this: http://arduino.cc/en/Reference/Return isn't helping me... :(

Thanks guys, you're awesome!

E

    byte returnedValue = Ethernet.maintain();
switch (returnedValue) {
case 0: Serial.println("nothing happened"); break;
case 1: Serial.println("renew failed"); break;
case 2: Serial.println("renew success); break;
case 3: Serial.println("rebind fail"); break;
case 4: Serial.println("rebind success"); break;
default: Serial.print("Unexpected returned value: ");
 Serial.println((int)returnedValue);
 break;

johnwasser: ```

Aren't those magic numbers defined anywhere?

johnwasser:     byte returnedValue = Ethernet.maintain(); switch (returnedValue) { case 0: Serial.println("nothing happened"); break; case 1: Serial.println("renew failed"); break; case 2: Serial.println("renew success); break; case 3: Serial.println("rebind fail"); break; case 4: Serial.println("rebind success"); break; default: Serial.print("Unexpected returned value: "); Serial.println((int)returnedValue); break;

Thanks John! will this also call the function or do i have to do that before? will your code substitute mine in functionality?

if(currentTime - ethernetMaintainTimeLapsed > 60000) {
    Ethernet.maintain();
    ethernetMaintainInterval = currentTime;
  }

Thanks!!

enricovara: will this also call the function or do i have to do that before?

if(currentTime - ethernetMaintainTimeLapsed > 60000) {
    Ethernet.maintain();
    ethernetMaintainInterval = currentTime;
  }

That will call the function, but you return value will be discarded.

enricovara:
Thanks John!
will this also call the function or do i have to do that before?
will your code substitute mine in functionality?

if(currentTime - ethernetMaintainTimeLapsed > 60000) {

Ethernet.maintain();  <<<<< Put it in place of this line
    ethernetMaintainInterval = currentTime;
  }




Thanks!!

Thank you all, problem solved, and I think I understand 'return' now :) ciao! :)