| /* | |
| DHCP-based IP printer | |
| This sketch uses the DHCP extensions to the Ethernet library | |
| to get an IP address via DHCP and print the address obtained. | |
| using an Arduino Wiznet Ethernet shield. | |
| Circuit: | |
| Ethernet shield attached to pins 10, 11, 12, 13 | |
| created 12 April 2011 | |
| modified 9 Apr 2012 | |
| by Tom Igoe | |
| modified 02 Sept 2015 | |
| by Arturo Guadalupi | |
| */ | |
| // Enter a MAC address for your controller below. | |
| // Newer Ethernet shields have a MAC address printed on a sticker on the shield | |
| byte mac[] = { | |
| 0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02 | |
| }; | |
| void setup() { | |
| // You can use Ethernet.init(pin) to configure the CS pin | |
| //Ethernet.init(10); // Most Arduino shields | |
| //Ethernet.init(5); // MKR ETH shield | |
| //Ethernet.init(0); // Teensy 2.0 | |
| //Ethernet.init(20); // Teensy++ 2.0 | |
| //Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet | |
| //Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet | |
| // Open serial communications and wait for port to open: | |
| Serial.begin(9600); | |
| while (!Serial) { | |
| ; // wait for serial port to connect. Needed for native USB port only | |
| } | |
| // start the Ethernet connection: | |
| Serial.println("Initialize Ethernet with DHCP:"); | |
| if (Ethernet.begin(mac) == 0) { | |
| Serial.println("Failed to configure Ethernet using DHCP"); | |
| if (Ethernet.hardwareStatus() == EthernetNoHardware) { | |
| Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :("); | |
| } else if (Ethernet.linkStatus() == LinkOFF) { | |
| Serial.println("Ethernet cable is not connected."); | |
| } | |
| // no point in carrying on, so do nothing forevermore: | |
| while (true) { | |
| delay(1); | |
| } | |
| } | |
| // print your local IP address: | |
| Serial.print("My IP address: "); | |
| Serial.println(Ethernet.localIP()); | |
| } | |
| void loop() { | |
| switch (Ethernet.maintain()) { | |
| case 1: | |
| //renewed fail | |
| Serial.println("Error: renewed fail"); | |
| break; | |
| case 2: | |
| //renewed success | |
| Serial.println("Renewed success"); | |
| //print your local IP address: | |
| Serial.print("My IP address: "); | |
| Serial.println(Ethernet.localIP()); | |
| break; | |
| case 3: | |
| //rebind fail | |
| Serial.println("Error: rebind fail"); | |
| break; | |
| case 4: | |
| //rebind success | |
| Serial.println("Rebind success"); | |
| //print your local IP address: | |
| Serial.print("My IP address: "); | |
| Serial.println(Ethernet.localIP()); | |
| break; | |
| default: | |
| //nothing happened | |
| break; | |
| } | |
| } | |