Ethernet Shield DHCP Address Printer

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1/*
2
3  DHCP-based IP printer
4
5  This sketch uses the DHCP extensions to the Ethernet library
6
7  to get an IP address via DHCP and print the address obtained.
8
9  using an Arduino Wiznet Ethernet shield.
10
11  Circuit:
12
13   Ethernet shield attached to pins 10, 11, 12, 13
14
15  created 12 April 2011
16
17  modified 9 Apr 2012
18
19  by Tom Igoe
20
21  modified 02 Sept 2015
22
23  by Arturo Guadalupi
24
25 */
26
27#include <SPI.h>
28#include <Ethernet.h>
29
30// Enter a MAC address for your controller below.
31// Newer Ethernet shields have a MAC address printed on a sticker on the shield
32byte mac[] = {
33
34  0x00, 0xAA, 0xBB, 0xCC, 0xDE, 0x02
35};
36
37void setup() {
38
39  // You can use Ethernet.init(pin) to configure the CS pin
40
41  //Ethernet.init(10);  // Most Arduino shields
42
43  //Ethernet.init(5);   // MKR ETH shield
44
45  //Ethernet.init(0);   // Teensy 2.0
46
47  //Ethernet.init(20);  // Teensy++ 2.0
48
49  //Ethernet.init(15);  // ESP8266 with Adafruit Featherwing Ethernet
50
51  //Ethernet.init(33);  // ESP32 with Adafruit Featherwing Ethernet
52
53  // Open serial communications and wait for port to open:
54
55  Serial.begin(9600);
56
57  while (!Serial) {
58
59    ; // wait for serial port to connect. Needed for native USB port only
60
61  }
62
63  // start the Ethernet connection:
64
65  Serial.println("Initialize Ethernet with DHCP:");
66
67  if (Ethernet.begin(mac) == 0) {
68
69    Serial.println("Failed to configure Ethernet using DHCP");
70
71    if (Ethernet.hardwareStatus() == EthernetNoHardware) {
72
73      Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
74
75    } else if (Ethernet.linkStatus() == LinkOFF) {
76
77      Serial.println("Ethernet cable is not connected.");
78
79    }
80
81    // no point in carrying on, so do nothing forevermore:
82
83    while (true) {
84
85      delay(1);
86
87    }
88
89  }
90
91  // print your local IP address:
92
93  Serial.print("My IP address: ");
94
95  Serial.println(Ethernet.localIP());
96}
97
98void loop() {
99
100  switch (Ethernet.maintain()) {
101
102    case 1:
103
104      //renewed fail
105
106      Serial.println("Error: renewed fail");
107
108      break;
109
110    case 2:
111
112      //renewed success
113
114      Serial.println("Renewed success");
115
116      //print your local IP address:
117
118      Serial.print("My IP address: ");
119
120      Serial.println(Ethernet.localIP());
121
122      break;
123
124    case 3:
125
126      //rebind fail
127
128      Serial.println("Error: rebind fail");
129
130      break;
131
132    case 4:
133
134      //rebind success
135
136      Serial.println("Rebind success");
137
138      //print your local IP address:
139
140      Serial.print("My IP address: ");
141
142      Serial.println(Ethernet.localIP());
143
144      break;
145
146    default:
147
148      //nothing happened
149
150      break;
151
152  }
153}