This is where the LAN8720 Ethernet PHY comes into play. In this guide, we’ll explore how to seamlessly integrate the LAN8720 module with an ESP32, providing a robust and reliable Ethernet connection for your IoT projects.
The W5500 and LAN8720 are both Ethernet controllers, but they serve different roles and have distinct features:
ets Jul 29 2019 12:21:46
rst:0x1 (POWERON_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))
waiting for download
ets Jul 29 2019 12:21:46
rst:0x1 (POWERON_RESET),boot:0x3 (DOWNLOAD_BOOT(UART0/UART1/SDIO_REI_REO_V2))
waiting for download
This sketch shows how to use lan8720 with esp32 with minimal/standard configuration
You can set the parameter in begin function or at start with define before the import
of ETH.h file, this way is preferible.
by Renzo Mischianti <mischianti.org>
// I²C-address of Ethernet PHY (0 or 1 for LAN8720, 31 for TLK110)
#define ETH_PHY_ADDR 1 // DEFAULT VALUE IS 0 YOU CAN OMIT IT
// Type of the Ethernet PHY (LAN8720 or TLK110)
#define ETH_PHY_TYPE ETH_PHY_LAN8720 // DEFAULT VALUE YOU CAN OMIT IT
// Pin# of the enable signal for the external crystal oscillator (-1 to disable for internal APLL source)
#define ETH_PHY_POWER -1 // DEFAULT VALUE YOU CAN OMIT IT
// Pin# of the I²C clock signal for the Ethernet PHY
#define ETH_PHY_MDC 23 // DEFAULT VALUE YOU CAN OMIT IT
// Pin# of the I²C IO signal for the Ethernet PHY
#define ETH_PHY_MDIO 18 // DEFAULT VALUE YOU CAN OMIT IT
// External clock from crystal oscillator
#define ETH_CLK_MODE ETH_CLOCK_GPIO0_IN // DEFAULT VALUE YOU CAN OMIT IT
#include <ETH.h>
static bool eth_connected = false;
void WiFiEvent(WiFiEvent_t event) {
switch (event) {
case ARDUINO_EVENT_ETH_START:
Serial.println("ETH Started");
ETH.setHostname("esp32-mischianti-eth");
break;
case ARDUINO_EVENT_ETH_CONNECTED:
Serial.println("ETH Connected");
break;
case ARDUINO_EVENT_ETH_GOT_IP:
Serial.print("ETH MAC: ");
Serial.print(ETH.macAddress());
Serial.print(", IPv4: ");
Serial.print(ETH.localIP());
if (ETH.fullDuplex()) {
Serial.print(", FULL_DUPLEX");
Serial.print(", ");
Serial.print(ETH.linkSpeed());
Serial.println("Mbps");
eth_connected = true;
break;
case ARDUINO_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default:
break;
void testClient(const char *host, uint16_t port) {
Serial.print("\nconnecting to ");
Serial.println(host);
WiFiClient client;
if (!client.connect(host, port)) {
Serial.println("connection failed");
return;
client.printf("GET / HTTP/1.1\r\nHost: %s\r\n\r\n", host);
while (client.connected() && !client.available())
while (client.available()) {
Serial.write(client.read());
Serial.println("closing connection\n");
client.stop();
void setup() {
Serial.begin(115200);
WiFi.onEvent(WiFiEvent);
ETH.begin();
void loop() {
if (eth_connected) {
testClient("mischianti.org", 80);
delay(10000);
You can pass the same parameter also in the begin function like so (I add only as an example in this case).
This sketch shows how to use lan8720 with esp32 with minimal/standard configuration
Parameter in begin function
by Renzo Mischianti <mischianti.org>
#include <ETH.h>
#define ETH_PARAM_PHY_ADDR 1
#define ETH_PARAM_PHY_TYPE ETH_PHY_LAN8720
#define ETH_PARAM_PHY_POWER -1
#define ETH_PARAM_PHY_MDC 23
#define ETH_PARAM_PHY_MDIO 18
#define ETH_PARAM_CLK_MODE ETH_CLOCK_GPIO0_IN
static bool eth_connected = false;
void WiFiEvent(WiFiEvent_t event) {
switch (event) {
case ARDUINO_EVENT_ETH_START:
Serial.println("ETH Started");
ETH.setHostname("esp32-mischianti-eth");
break;
case ARDUINO_EVENT_ETH_CONNECTED:
Serial.println("ETH Connected");
break;
case ARDUINO_EVENT_ETH_GOT_IP:
Serial.print("ETH MAC: ");
Serial.print(ETH.macAddress());
Serial.print(", IPv4: ");
Serial.print(ETH.localIP());
if (ETH.fullDuplex()) {
Serial.print(", FULL_DUPLEX");
Serial.print(", ");
Serial.print(ETH.linkSpeed());
Serial.println("Mbps");
eth_connected = true;
break;
case ARDUINO_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default:
break;
void testClient(const char *host, uint16_t port) {
Serial.print("\nconnecting to ");
Serial.println(host);
WiFiClient client;
if (!client.connect(host, port)) {
Serial.println("connection failed");
return;
client.printf("GET / HTTP/1.1\r\nHost: %s\r\n\r\n", host);
while (client.connected() && !client.available())
while (client.available()) {
Serial.write(client.read());
Serial.println("closing connection\n");
client.stop();
void setup() {
Serial.begin(115200);
WiFi.onEvent(WiFiEvent);
ETH.begin(ETH_PARAM_PHY_ADDR, ETH_PARAM_PHY_POWER, ETH_PARAM_PHY_MDC, ETH_PARAM_PHY_MDIO, ETH_PARAM_PHY_TYPE, ETH_PARAM_CLK_MODE);
void loop() {
if (eth_connected) {
testClient("mischianti.org", 80);
delay(10000);
The Output of the code is here.
ets Jul 29 2019 12:21:46
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0030,len:1184
load:0x40078000,len:13260
load:0x40080400,len:3028
entry 0x400805e4
ETH Started
ETH Connected
ETH MAC: B8:D6:1A:68:E5:7F, IPv4: 192.168.1.115, FULL_DUPLEX, 100Mbps
connecting to mischianti.org
HTTP/1.1 301 Moved Permanently
Connection: Keep-Alive
Keep-Alive: timeout=5, max=100
content-type: text/html
content-length: 3145
date: Fri, 02 Feb 2024 10:55:05 GMT
server: LiteSpeed
x-qc-pop: EU-FR-NTE-51
location: https://mischianti.org/
<!DOCTYPE html><html lang="en-US"><head>
<title> 301 Moved Permanently
</title>
<meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<style>
*{box-sizing:border-box}.site-logo{max-width:100%;background-repeat:none;display:inline-block;height:45px;width:75px;margin:5px}body{font-family:-apple-system,system-ui,BlinkMacSystemFont,"Segoe UI",Helvetica,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";margin:0;line-height:1.3;font-size:.95em}.text-center,h2{text-align:center;margin-top:1.5em;margin-bottom:.5em}h2{font-size:7em;color:#555;margin-top:0}h4{font-size:1.25em;font-weight:400;color:#6d6c64;margin-top:0}a{color:#36f;font-weight:600;word-break:break-word}.text-center{margin-bottom:3em}
</style>
</head>
<body style="background-color:#f7f9fb; display: flex; min-height: 100vh;flex-direction: column;">
<div style="display:flex;background-color:#004262;padding:8px"><a href="https://quic.cloud/" title="QUIC.cloud" rel="home"><div class="site-logo"><svg height="50" viewBox="0 0 75 50" width="75" xmlns="http://www.w3.org/2000/svg"><path d="m71.301 15.049c-2.885-3.792-7.072-6.232-11.791-6.872-3.709-.503-7.415.154-10.721 1.901-.44.232-.873.484-1.289.75l-1.486 1.117 3.835 5.041 1.169-.889c.236-.147.481-.288.73-.421 2.13-1.124 4.518-1.547 6.908-1.224 3.045.413 5.744 1.987 7.604 4.432 1.861 2.445 2.657 5.467 2.244 8.511-.853 6.283-6.663 10.7-12.942 9.849-2.389-.324-4.579-1.37-6.332-3.022-.209-.198-.407-.399-.59-.599l-14.45-18.99-.005.059-1.522-2-.165-.199c-.346-.385-.712-.76-1.086-1.111-2.838-2.677-6.382-4.369-10.249-4.895-10.162-1.38-19.56 5.769-20.939 15.935-1.38 10.164 5.768 19.558 15.934 20.937 3.868.525 7.733-.16 11.186-1.983.14-.074.275-.153.413-.229l-3.895-5.119c-2.14 1.006-4.493 1.377-6.852 1.057-6.706-.912-11.419-7.106-10.51-13.812.91-6.705 7.099-11.418 13.811-10.509 2.549.346 4.885 1.461 6.758 3.228.219.206.432.422.637.644l11.357 14.928.006-.061 4.612 6.062.158.193c.324.361.676.723 1.046 1.072 2.72 2.564 6.117 4.187 9.825 4.689.811.111 1.614.164 2.412.164 8.775-.002 16.444-6.504 17.658-15.438.642-4.718-.594-9.405-3.479-13.196z" fill="#97a3aa"/><path d="m40.375 40.139c-.059-.061-.123-.121-.179-.182l-7.318-9.609c-.318-.356-.665-.711-1.03-1.056-2.72-2.565-6.117-4.186-9.825-4.69-.354-.047-.707-.082-1.061-.108h-.542l2.7 3.533c.058.06.123.121.178.181l7.317 9.61c.319.355.665.711 1.03 1.055 2.72 2.564 6.117 4.188 9.825 4.689.354.049.707.082 1.061.109h.542z" fill="#9ff"/></svg></div></a><div style="margin-top:20px;margin-left:5px"><a href="https://quic.cloud/" title="QUIC.cloud" rel="home" style="color:#fff;font-size:1.25em;text-decoration:none">QUIC<span style="color:#f60">.</span><span style="color:#e4e4f1">cloud</span></a></a></div></div><div style="max-width:1140px;margin:auto;padding:0 1.6em 1.6em; display:flex; align-items: center;flex: 1;"><div style="color:#555"><div class="text-center"><h2>301</h2>
<h4>Moved Permanently
<h4>The document has been permanently moved.</h4>
<p>This page is generated by <a href="https://quic.cloud/">QUIC.cloud</a> CDN on the EU-FR-NTE-51 server.</p>
</div></div></div></body></html>
closing connection
Connection of the device with the patch
If you do the patch, you need to manage the enable state of the Crystal Oscillator, you must set the GPIO17 as the power pin; this trick allows you to boot the device and, after the MCU boot operation, enable the Crystal Oscillator.
Probably with high-quality board, you don’t need that.
This sketch shows how to use patched lan8720 with esp32
Remeber you must connect the enable pin of Crystal Oscillator to the NC pin of the board
by Renzo Mischianti <mischianti.org>
// I²C-address of Ethernet PHY (0 or 1 for LAN8720, 31 for TLK110)
#define ETH_PHY_ADDR 1 // DEFAULT VALUE IS 0 YOU CAN OMIT IT
// Pin# of the enable signal for the external crystal oscillator (-1 to disable for internal APLL source)
#define ETH_PHY_POWER 17 // DEFAULT VALUE YOU CAN OMIT IT
#include <ETH.h>
static bool eth_connected = false;
void WiFiEvent(WiFiEvent_t event) {
switch (event) {
case ARDUINO_EVENT_ETH_START:
Serial.println("ETH Started");
ETH.setHostname("esp32-mischianti-eth");
break;
case ARDUINO_EVENT_ETH_CONNECTED:
Serial.println("ETH Connected");
break;
case ARDUINO_EVENT_ETH_GOT_IP:
Serial.print("ETH MAC: ");
Serial.print(ETH.macAddress());
Serial.print(", IPv4: ");
Serial.print(ETH.localIP());
if (ETH.fullDuplex()) {
Serial.print(", FULL_DUPLEX");
Serial.print(", ");
Serial.print(ETH.linkSpeed());
Serial.println("Mbps");
eth_connected = true;
break;
case ARDUINO_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default:
break;
void testClient(const char *host, uint16_t port) {
Serial.print("\nconnecting to ");
Serial.println(host);
WiFiClient client;
if (!client.connect(host, port)) {
Serial.println("connection failed");
return;
client.printf("GET / HTTP/1.1\r\nHost: %s\r\n\r\n", host);
while (client.connected() && !client.available())
while (client.available()) {
Serial.write(client.read());
Serial.println("closing connection\n");
client.stop();
void setup() {
Serial.begin(115200);
WiFi.onEvent(WiFiEvent);
ETH.begin();
void loop() {
if (eth_connected) {
testClient("mischianti.org", 80);
delay(10000);
This sketch shows how to use patched lan8720 with esp32
We are going to do a raw GET request to online service httpbin.org
http://httpbin.org/get
by Renzo Mischianti <mischianti.org>
// I²C-address of Ethernet PHY (0 or 1 for LAN8720, 31 for TLK110)
#define ETH_PHY_ADDR 1 // DEFAULT VALUE IS 0 YOU CAN OMIT IT
// Pin# of the enable signal for the external crystal oscillator (-1 to disable for internal APLL source)
#define ETH_PHY_POWER 17 // DEFAULT VALUE YOU CAN OMIT IT
#include <ETH.h>
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
//char server[] = "www.google.com"; // name address for Google (using DNS)
char server[] = "httpbin.org"; // name address for Google (using DNS)
// Initialize the Ethernet client library
WiFiClient client;
// Variables to measure the speed
unsigned long beginMicros, endMicros;
unsigned long byteCount = 0;
bool printWebData = true; // set to false for better speed measurement
static bool eth_connected = false;
void WiFiEvent(WiFiEvent_t event) {
switch (event) {
case ARDUINO_EVENT_ETH_START:
Serial.println("ETH Started");
ETH.setHostname("esp32-mischianti-eth");
break;
case ARDUINO_EVENT_ETH_CONNECTED:
Serial.println("ETH Connected");
break;
case ARDUINO_EVENT_ETH_GOT_IP:
Serial.println();
Serial.print("ETH MAC: ");
Serial.print(ETH.macAddress());
Serial.print(", IPv4: ");
Serial.print(ETH.localIP());
if (ETH.fullDuplex()) {
Serial.print(", FULL_DUPLEX");
Serial.print(", ");
Serial.print(ETH.linkSpeed());
Serial.println("Mbps");
eth_connected = true;
break;
case ARDUINO_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default:
break;
void setup() {
Serial.begin(115200);
WiFi.onEvent(WiFiEvent);
ETH.begin();
while (!eth_connected) {
Serial.print(".");
delay(100);
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println("Connected!");
// Make a HTTP request:
client.println("GET /get HTTP/1.1");
client.println("Host: httpbin.org");
client.println("Connection: close");
client.println();
} else {
// if you didn't get a connection to the server:
Serial.println("connection failed");
beginMicros = micros();
void loop() {
// if there are incoming bytes available
// from the server, read them and print them:
int len = client.available();
if (len > 0) {
byte buffer[80];
if (len > 80) len = 80;
client.read(buffer, len);
if (printWebData) {
Serial.write(buffer, len); // show in the serial monitor (slows some boards)
byteCount = byteCount + len;
// if the server's disconnected, stop the client:
if (len == 0 && !client.connected()) {
endMicros = micros();
Serial.println();
Serial.println("disconnecting.");
client.stop();
Serial.print("Received ");
Serial.print(byteCount);
Serial.print(" bytes in ");
float seconds = (float)(endMicros - beginMicros) / 1000000.0;
Serial.print(seconds, 4);
float rate = (float)byteCount / seconds / 1000.0;
Serial.print(", rate = ");
Serial.print(rate);
Serial.print(" kbytes/second");
Serial.println();
// do nothing forevermore:
while (true) {
delay(1);
And here is the result.
ETH Started
ETH Connected
...........
ETH MAC: B8:D6:1A:68:E5:7F, IPv4: 192.168.1.115, FULL_DUPLEX, 100Mbps
Connected!
HTTP/1.1 200 OK
Date: Fri, 02 Feb 2024 15:44:00 GMT
Content-Type: application/json
Content-Length: 199
Connection: close
Server: gunicorn/19.9.0
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
"args": {},
"headers": {
"Host": "httpbin.org",
"X-Amzn-Trace-Id": "Root=1-65bd0dc0-4ea2c7a33ad187b40ac5cda8"
"origin": "84.221.199.122",
"url": "http://httpbin.org/get"
disconnecting.
Received 424 bytes in 0.2767, rate = 1.53 kbytes/second
Now, an HTTPS request.
ETH MAC: B8:D6:1A:68:E5:7F, IPv4: 192.168.1.115, FULL_DUPLEX, 100Mbps
Connected!
HTTP/1.1 400 Bad Request
Server: awselb/2.0
Date: Fri, 02 Feb 2024 16:25:02 GMT
Content-Type: text/html
Content-Length: 220
Connection: close
<head><title>400 The plain HTTP request was sent to HTTPS port</title></head>
<center><h1>400 Bad Request</h1></center>
<center>The plain HTTP request was sent to HTTPS port</center>
</body>
</html>
disconnecting.
Received 370 bytes in 0.2764, rate = 1.34 kbytes/second
First of all, we must use the
WiFiClientSecure
that implements the SSL layer. But if you substitute the line
// Initialize the Ethernet client library
WiFiClient client;
This sketch shows how to use patched lan8720 with esp32
We are going to do a raw GET request to online service httpbin.org
http://httpbin.org/get
by Renzo Mischianti <mischianti.org>
// I²C-address of Ethernet PHY (0 or 1 for LAN8720, 31 for TLK110)
#define ETH_PHY_ADDR 1 // DEFAULT VALUE IS 0 YOU CAN OMIT IT
// Pin# of the enable signal for the external crystal oscillator (-1 to disable for internal APLL source)
#define ETH_PHY_POWER 17 // DEFAULT VALUE YOU CAN OMIT IT
#include <ETH.h>
#include <WiFiClientSecure.h>
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
//char server[] = "www.google.com"; // name address for Google (using DNS)
char server[] = "httpbin.org"; // name address for Google (using DNS)
// Initialize the Ethernet client library
WiFiClientSecure client;
// Variables to measure the speed
unsigned long beginMicros, endMicros;
unsigned long byteCount = 0;
bool printWebData = true; // set to false for better speed measurement
static bool eth_connected = false;
void WiFiEvent(WiFiEvent_t event) {
switch (event) {
case ARDUINO_EVENT_ETH_START:
Serial.println("ETH Started");
ETH.setHostname("esp32-mischianti-eth");
break;
case ARDUINO_EVENT_ETH_CONNECTED:
Serial.println("ETH Connected");
break;
case ARDUINO_EVENT_ETH_GOT_IP:
Serial.println();
Serial.print("ETH MAC: ");
Serial.print(ETH.macAddress());
Serial.print(", IPv4: ");
Serial.print(ETH.localIP());
if (ETH.fullDuplex()) {
Serial.print(", FULL_DUPLEX");
Serial.print(", ");
Serial.print(ETH.linkSpeed());
Serial.println("Mbps");
eth_connected = true;
break;
case ARDUINO_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default:
break;
void setup() {
Serial.begin(115200);
WiFi.onEvent(WiFiEvent);
ETH.begin();
while (!eth_connected) {
Serial.print(".");
delay(100);
client.setInsecure();
// if you get a connection, report back via serial:
if (client.connect(server, 443)) {
Serial.println("Connected!");
// Make a HTTP request:
client.println("GET /get HTTP/1.1");
client.println("Host: httpbin.org");
client.println("Connection: close");
client.println();
} else {
// if you didn't get a connection to the server:
Serial.println("connection failed");
beginMicros = micros();
void loop() {
// if there are incoming bytes available
// from the server, read them and print them:
int len = client.available();
if (len > 0) {
byte buffer[80];
if (len > 80) len = 80;
client.read(buffer, len);
if (printWebData) {
Serial.write(buffer, len); // show in the serial monitor (slows some boards)
byteCount = byteCount + len;
// if the server's disconnected, stop the client:
if (len == 0 && !client.connected()) {
endMicros = micros();
Serial.println();
Serial.println("disconnecting.");
client.stop();
Serial.print("Received ");
Serial.print(byteCount);
Serial.print(" bytes in ");
float seconds = (float)(endMicros - beginMicros) / 1000000.0;
Serial.print(seconds, 4);
float rate = (float)byteCount / seconds / 1000.0;
Serial.print(", rate = ");
Serial.print(rate);
Serial.print(" kbytes/second");
Serial.println();
// do nothing forevermore:
while (true) {
delay(1);
ETH Connected
..........
ETH MAC: B8:D6:1A:68:E5:7F, IPv4: 192.168.1.115, FULL_DUPLEX, 100Mbps
Connected!
HTTP/1.1 200 OK
Date: Fri, 02 Feb 2024 16:36:00 GMT
Content-Type: application/json
Content-Length: 200
Connection: close
Server: gunicorn/19.9.0
Access-Control-Allow-Origin: *
Access-Control-Allow-Credentials: true
"args": {},
"headers": {
"Host": "httpbin.org",
"X-Amzn-Trace-Id": "Root=1-65bd19f0-36775c160826895f26d52da8"
"origin": "84.221.199.122",
"url": "https://httpbin.org/get"
disconnecting.
Received 425 bytes in 0.1594, rate = 2.67 kbytes/second
Ok, now we try to be a good guy; we are going to download the Certification Authority certificate to validate the host.
So in the httpbin page click on setting of the site.
const char* rootCA= R""""(-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----)"""";
Now we can set the certificate of Certification Autority, needed to validate the server httpbin to the WiFiClientSecure to be able to do the check.
The code become so.
This sketch shows how to use patched lan8720 with esp32
We are going to do a raw GET request to online service httpbin.org
http://httpbin.org/get
by Renzo Mischianti <mischianti.org>
// I²C-address of Ethernet PHY (0 or 1 for LAN8720, 31 for TLK110)
#define ETH_PHY_ADDR 1 // DEFAULT VALUE IS 0 YOU CAN OMIT IT
// Pin# of the enable signal for the external crystal oscillator (-1 to disable for internal APLL source)
#define ETH_PHY_POWER 17 // DEFAULT VALUE YOU CAN OMIT IT
#include <ETH.h>
#include <WiFiClientSecure.h>
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
//IPAddress server(74,125,232,128); // numeric IP for Google (no DNS)
//char server[] = "www.google.com"; // name address for Google (using DNS)
char server[] = "httpbin.org"; // name address for Google (using DNS)
const char* rootCA= R""""(-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----)"""";
// Initialize the Ethernet client library
WiFiClientSecure client;
// Variables to measure the speed
unsigned long beginMicros, endMicros;
unsigned long byteCount = 0;
bool printWebData = true; // set to false for better speed measurement
static bool eth_connected = false;
void WiFiEvent(WiFiEvent_t event) {
switch (event) {
case ARDUINO_EVENT_ETH_START:
Serial.println("ETH Started");
ETH.setHostname("esp32-mischianti-eth");
break;
case ARDUINO_EVENT_ETH_CONNECTED:
Serial.println("ETH Connected");
break;
case ARDUINO_EVENT_ETH_GOT_IP:
Serial.println();
Serial.print("ETH MAC: ");
Serial.print(ETH.macAddress());
Serial.print(", IPv4: ");
Serial.print(ETH.localIP());
if (ETH.fullDuplex()) {
Serial.print(", FULL_DUPLEX");
Serial.print(", ");
Serial.print(ETH.linkSpeed());
Serial.println("Mbps");
eth_connected = true;
break;
case ARDUINO_EVENT_ETH_DISCONNECTED:
Serial.println("ETH Disconnected");
eth_connected = false;
break;
case ARDUINO_EVENT_ETH_STOP:
Serial.println("ETH Stopped");
eth_connected = false;
break;
default:
break;
void setup() {
Serial.begin(115200);
WiFi.onEvent(WiFiEvent);
ETH.begin();
while (!eth_connected) {
Serial.print(".");
delay(100);
client.setCACert(rootCA);
// if you get a connection, report back via serial:
if (client.connect(server, 443)) {
Serial.println("Connected!");
// Make a HTTP request:
client.println("GET /get HTTP/1.1");
client.println("Host: httpbin.org");
client.println("Connection: close");
client.println();
} else {
// if you didn't get a connection to the server:
Serial.println("connection failed");
beginMicros = micros();
void loop() {
// if there are incoming bytes available
// from the server, read them and print them:
int len = client.available();
if (len > 0) {
byte buffer[80];
if (len > 80) len = 80;
client.read(buffer, len);
if (printWebData) {
Serial.write(buffer, len); // show in the serial monitor (slows some boards)
byteCount = byteCount + len;
// if the server's disconnected, stop the client:
if (len == 0 && !client.connected()) {
endMicros = micros();
Serial.println();
Serial.println("disconnecting.");
client.stop();
Serial.print("Received ");
Serial.print(byteCount);
Serial.print(" bytes in ");
float seconds = (float)(endMicros - beginMicros) / 1000000.0;
Serial.print(seconds, 4);
float rate = (float)byteCount / seconds / 1000.0;
Serial.print(", rate = ");
Serial.print(rate);
Serial.print(" kbytes/second");
Serial.println();
// do nothing forevermore:
while (true) {
delay(1);
7 May 2024 at 10:57
Hello Renzo, thanks for the post, helped me a lot. Instead of adding the resistors you can also desolder the crystal from the PHY, set the clock mode to ETH_CLOCK_GPIO17_OUT and connect the PHY clock to GPIO17.
Hi Axel,
thanks for the info, I try your solution when i write the article, but I think, that there was a communication problem and It didn’t work.
I retry this solution soon, and I update the article to the framework 3.x .
Thanks again Renzo
