CHAPTER 2 ■ INTERNET CONNECTIVITY// DHCP failed, attempt to connect to Ethernet with static IP
Ethernet.begin(mac, staticIP);
}
// Delay to let Ethernet shield initialize
delay(1000);
// Connection successful
Serial.println("[INFO] Connection Successful");
Serial.print("");
printConnectionInformation();
Serial.println("-----------------------------------------------");
Serial.println("");
}
Once Arduino has successfully connected to the Internet, the Ethernet
printConnectionInformation() function , provided in Listing 2-4 , is called. This function
prints connection information such as IP address, subnet mask, gateway, and DNS to the
Serial Monitor window.
Listing 2-4. Function to Display Connection Information
void printConnectionInformation()
{
// Print Connection Information
Serial.print("[INFO] IP Address: ");
Serial.println(Ethernet.localIP());
Serial.print("[INFO] Subnet Mask: ");
Serial.println(Ethernet.subnetMask());
Serial.print("[INFO] Gateway: ");
Serial.println(Ethernet.gatewayIP());
Serial.print("[INFO] DNS: ");
Serial.println(Ethernet.dnsServerIP());
}
Standard Functions
Finally, the code in this third and last section is provided in Listing 2-5. It implements
Arduino’s standard setup() and loop() functions. For this project, you are simply
connecting Arduino to the Internet with no processing thereafter, so the loop() function
will remain empty.