Ethernet library: add missing functions

libraries/Ethernet/README.md

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+# Ethernet Library for Arduino
+
+Provides Ethernet connectivity for Arduino boards using the Arduino Zephyr core, together with a shield or carrier featuring an Ethernet connector.
+
+📖 For more information about this library please read the documentation [here](http://www.arduino.cc/en/Reference/Ethernet).
+
+## License
+
+Copyright (c) 2025 Arduino SA. All rights reserved.
+
+This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.

libraries/Ethernet/examples/AdvancedChatServer/AdvancedChatServer.ino

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+/*
+ Advanced Chat Server
+
+ A more advanced server that distributes any incoming messages
+ to all connected clients but the client the message comes from.
+ To use, telnet to your device's IP address and type.
+
+ */
+
+#include "ZephyrServer.h"
+#include "ZephyrClient.h"
+#include "ZephyrEthernet.h"
+
+// The IP address will be dependent on your local network.
+// gateway and subnet are optional:
+IPAddress ip(192, 168, 1, 177);
+IPAddress myDns(192, 168, 1, 1);
+IPAddress gateway(192, 168, 1, 1);
+IPAddress subnet(255, 255, 255, 0);
+
+
+// telnet defaults to port 23
+ZephyrServer server(23);
+
+ZephyrClient clients[8];
+
+void setup() {
+
+  // initialize the Ethernet device
+  Ethernet.begin(ip, myDns, gateway, subnet);
+
+  // 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
+  }
+
+  // Check for Ethernet hardware present
+  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
+    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
+    while (true) {
+      delay(1); // do nothing, no point running without Ethernet hardware
+    }
+  }
+  if (Ethernet.linkStatus() == LinkOFF) {
+    Serial.println("Ethernet cable is not connected.");
+  }
+
+  // start listening for clients
+  server.begin();
+
+  Serial.print("Chat server address:");
+  Serial.println(Ethernet.localIP());
+}
+
+void loop() {
+  // check for any new client connecting, and say hello (before any incoming data)
+  ZephyrClient newClient = server.accept();
+  if (newClient) {
+    for (byte i=0; i < 8; i++) {
+      if (!clients[i]) {
+        Serial.print("We have a new client #");
+        Serial.println(i);
+        newClient.print("Hello, client number: ");
+        newClient.println(i);
+        // Once we "accept", the client is no longer tracked by EthernetServer
+        // so we must store it into our list of clients
+        clients[i] = newClient;
+        break;
+      }
+    }
+  }
+
+  // check for incoming data from all clients
+  for (byte i=0; i < 8; i++) {
+    if (clients[i] && clients[i].available() > 0) {
+      // read bytes from a client
+      byte buffer[80];
+      int count = clients[i].read(buffer, 80);
+      // write the bytes to all other connected clients
+      for (byte j=0; j < 8; j++) {
+        if (j != i && clients[j].connected()) {
+          clients[j].write(buffer, count);
+        }
+      }
+    }
+  }
+
+  // stop any clients which disconnect
+  for (byte i=0; i < 8; i++) {
+    if (clients[i] && !clients[i].connected()) {
+      Serial.print("disconnect client #");
+      Serial.println(i);
+      clients[i].stop();
+    }
+  }
+}

libraries/Ethernet/examples/BarometricPressureWebServer/BarometricPressureWebServer.ino

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+/*
+  SCP1000 Barometric Pressure Sensor Display
+
+ Serves the output of a Barometric Pressure Sensor as a web page.
+ Uses the SPI library. For details on the sensor, see:
+ http://www.sparkfun.com/commerce/product_info.php?products_id=8161
+
+ This sketch adapted from Nathan Seidle's SCP1000 example for PIC:
+ http://www.sparkfun.com/datasheets/Sensors/SCP1000-Testing.zip
+
+ TODO: this hardware is long obsolete.  This example program should
+ be rewritten to use https://www.sparkfun.com/products/9721
+
+ Circuit:
+ SCP1000 sensor attached to pins 6,7, and 11 - 13:
+ DRDY: pin 6
+ CSB: pin 7
+ MOSI: pin 11
+ MISO: pin 12
+ SCK: pin 13
+
+ */
+
+#include "ZephyrServer.h"
+#include "ZephyrEthernet.h"
+// the sensor communicates using SPI, so include the library:
+#include <SPI.h>
+
+// assign an IP address for the controller:
+IPAddress ip(192, 168, 1, 20);
+
+// Initialize the Ethernet server library
+// with the IP address and port you want to use
+// (port 80 is default for HTTP):
+ZephyrServer server(80);
+
+//Sensor's memory register addresses:
+const int PRESSURE = 0x1F;      //3 most significant bits of pressure
+const int PRESSURE_LSB = 0x20;  //16 least significant bits of pressure
+const int TEMPERATURE = 0x21;   //16 bit temperature reading
+
+// pins used for the connection with the sensor
+// the others you need are controlled by the SPI library):
+const int dataReadyPin = 6;
+const int chipSelectPin = 7;
+
+float temperature = 0.0;
+long pressure = 0;
+long lastReadingTime = 0;
+
+void setup() {
+
+  // start the SPI library:
+  SPI.begin();
+
+  // start the Ethernet connection
+  Ethernet.begin(ip);
+
+  // 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
+  }
+
+  // Check for Ethernet hardware present
+  if (Ethernet.hardwareStatus() == EthernetNoHardware) {
+    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
+    while (true) {
+      delay(1); // do nothing, no point running without Ethernet hardware
+    }
+  }
+  if (Ethernet.linkStatus() == LinkOFF) {
+    Serial.println("Ethernet cable is not connected.");
+  }
+
+  // start listening for clients
+  server.begin();
+
+  // initalize the data ready and chip select pins:
+  pinMode(dataReadyPin, INPUT);
+  pinMode(chipSelectPin, OUTPUT);
+
+  //Configure SCP1000 for low noise configuration:
+  writeRegister(0x02, 0x2D);
+  writeRegister(0x01, 0x03);
+  writeRegister(0x03, 0x02);
+
+  // give the sensor and Ethernet shield time to set up:
+  delay(1000);
+
+  //Set the sensor to high resolution mode tp start readings:
+  writeRegister(0x03, 0x0A);
+
+}
+
+void loop() {
+  // check for a reading no more than once a second.
+  if (millis() - lastReadingTime > 1000) {
+    // if there's a reading ready, read it:
+    // don't do anything until the data ready pin is high:
+    if (digitalRead(dataReadyPin) == HIGH) {
+      getData();
+      // timestamp the last time you got a reading:
+      lastReadingTime = millis();
+    }
+  }
+
+  // listen for incoming Ethernet connections:
+  listenForEthernetClients();
+}
+
+
+void getData() {
+  Serial.println("Getting reading");
+  //Read the temperature data
+  int tempData = readRegister(0x21, 2);
+
+  // convert the temperature to celsius and display it:
+  temperature = (float)tempData / 20.0;
+
+  //Read the pressure data highest 3 bits:
+  byte  pressureDataHigh = readRegister(0x1F, 1);
+  pressureDataHigh &= 0b00000111; //you only needs bits 2 to 0
+
+  //Read the pressure data lower 16 bits:
+  unsigned int pressureDataLow = readRegister(0x20, 2);
+  //combine the two parts into one 19-bit number:
+  pressure = ((pressureDataHigh << 16) | pressureDataLow) / 4;
+
+  Serial.print("Temperature: ");
+  Serial.print(temperature);
+  Serial.println(" degrees C");
+  Serial.print("Pressure: " + String(pressure));
+  Serial.println(" Pa");
+}
+
+void listenForEthernetClients() {
+  // listen for incoming clients
+  ZephyrClient client = server.accept();
+  if (client) {
+    Serial.println("Got a client");
+    // an http request ends with a blank line
+    boolean currentLineIsBlank = true;
+    while (client.connected()) {
+      if (client.available()) {
+        char c = client.read();
+        // if you've gotten to the end of the line (received a newline
+        // character) and the line is blank, the http request has ended,
+        // so you can send a reply
+        if (c == '\n' && currentLineIsBlank) {
+          // send a standard http response header
+          client.println("HTTP/1.1 200 OK");
+          client.println("Content-Type: text/html");
+          client.println();
+          // print the current readings, in HTML format:
+          client.print("Temperature: ");
+          client.print(temperature);
+          client.print(" degrees C");
+          client.println("<br />");
+          client.print("Pressure: " + String(pressure));
+          client.print(" Pa");
+          client.println("<br />");
+          break;
+        }
+        if (c == '\n') {
+          // you're starting a new line
+          currentLineIsBlank = true;
+        } else if (c != '\r') {
+          // you've gotten a character on the current line
+          currentLineIsBlank = false;
+        }
+      }
+    }
+    // give the web browser time to receive the data
+    delay(1);
+    // close the connection:
+    client.stop();
+  }
+}
+
+
+//Send a write command to SCP1000
+void writeRegister(byte registerName, byte registerValue) {
+  // SCP1000 expects the register name in the upper 6 bits
+  // of the byte:
+  registerName <<= 2;
+  // command (read or write) goes in the lower two bits:
+  registerName |= 0b00000010; //Write command
+
+  // take the chip select low to select the device:
+  digitalWrite(chipSelectPin, LOW);
+
+  SPI.transfer(registerName); //Send register location
+  SPI.transfer(registerValue); //Send value to record into register
+
+  // take the chip select high to de-select:
+  digitalWrite(chipSelectPin, HIGH);
+}
+
+
+//Read register from the SCP1000:
+unsigned int readRegister(byte registerName, int numBytes) {
+  byte inByte = 0;           // incoming from  the SPI read
+  unsigned int result = 0;   // result to return
+
+  // SCP1000 expects the register name in the upper 6 bits
+  // of the byte:
+  registerName <<=  2;
+  // command (read or write) goes in the lower two bits:
+  registerName &= 0b11111100; //Read command
+
+  // take the chip select low to select the device:
+  digitalWrite(chipSelectPin, LOW);
+  // send the device the register you want to read:
+  int command = SPI.transfer(registerName);
+  // send a value of 0 to read the first byte returned:
+  inByte = SPI.transfer(0x00);
+
+  result = inByte;
+  // if there's more than one byte returned,
+  // shift the first byte then get the second byte:
+  if (numBytes > 1) {
+    result = inByte << 8;
+    inByte = SPI.transfer(0x00);
+    result = result | inByte;
+  }
+  // take the chip select high to de-select:
+  digitalWrite(chipSelectPin, HIGH);
+  // return the result:
+  return (result);
+}