Arduino ethercard.h get dhcp option

Question

Is there any way to get a specific dhcp option using Arduino and ethernet? I am trying to spare the pins that would be used as a setup, so i send the configuration to the arduino via lan. I would like to be able to specify where the arduino will receive the configuration from. I was thinking of providing it with a configuration server through a dhcp option (option codes 224 through 255 are reserved for private use)

I cannot find any information on how to retrive specific dhcp options using ethercard.h and ENC28J60 board anywhere in the documentation.

Did anyone attempt (and succeed) in doing this?

thanks

Answer 1

After some extensive reading of the ethercard source, i came up with this:

Add ether.dhcpAddOptionCallback(246,DHCPOption); to void setup, and this void:

void DHCPOption(uint8_t option, const byte* data, uint8_t len) {
    Serial.println(option);
    Serial.println(len);
    for (int i = 0; i < len; i++) {
        Serial.println(data[i]);
    }
}