151 lines
4.8 KiB
C++
151 lines
4.8 KiB
C++
/*
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Web client
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This sketch connects to a website (http://www.arduino.cc/asciilogo.txt)
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using an Arduino Wiznet Ethernet shield.
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Circuit:
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* Ethernet shield attached to pins 10, 11, 12, 13
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created 18 Dec 2009
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by David A. Mellis
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modified 9 Apr 2012
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by Noah Koontz, based on work by Adrian McEwen and Tom Igoe
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*/
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// NOTE: This example REQUIRES the EthernetLarge library.
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// You can get it here: https://github.com/OPEnSLab-OSU/EthernetLarge
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#include <SPI.h>
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#include <EthernetLarge.h>
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#include <SSLClient.h>
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#include "trust_anchors.h"
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// Enter a MAC address for your controller below.
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// Newer Ethernet shields have a MAC address printed on a sticker on the shield
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byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
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// if you don't want to use DNS (and reduce your sketch size)
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// use the numeric IP instead of the name for the server:
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//IPAddress server(54,85,55,79); // numeric IP for Google (no DNS)
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const char server[] = "www.arduino.cc"; // name address for Arduino (using DNS)
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const char server_host[] = "www.arduino.cc"; // leave this alone, change only above two
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// Set the static IP address to use if the DHCP fails to assign
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IPAddress ip(192, 168, 0, 177);
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IPAddress myDns(8, 8, 8, 8);
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// Choose the analog pin to get semi-random data from for SSL
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// Pick a pin that's not connected or attached to a randomish voltage source
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const int rand_pin = A5;
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// Initialize the SSL client library
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// We input an EthernetClient, our trust anchors, and the analog pin
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EthernetClient base_client;
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SSLClient client(base_client, TAs, (size_t)TAs_NUM, rand_pin);
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// Variables to measure the speed
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unsigned long beginMicros, endMicros;
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unsigned long byteCount = 0;
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bool printWebData = true; // set to false for better speed measurement
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void setup() {
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// You can use Ethernet.init(pin) to configure the CS pin
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Ethernet.init(10); // Most Arduino shields
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//Ethernet.init(5); // MKR ETH shield
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//Ethernet.init(0); // Teensy 2.0
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//Ethernet.init(20); // Teensy++ 2.0
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//Ethernet.init(15); // ESP8266 with Adafruit Featherwing Ethernet
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//Ethernet.init(33); // ESP32 with Adafruit Featherwing Ethernet
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// Open serial communications and wait for port to open:
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Serial.begin(115200);
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while (!Serial) {
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; // wait for serial port to connect. Needed for native USB port only
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}
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// start the Ethernet connection:
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Serial.println("Initialize Ethernet with DHCP:");
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if (Ethernet.begin(mac) == 0) {
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Serial.println("Failed to configure Ethernet using DHCP");
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// Check for Ethernet hardware present
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if (Ethernet.hardwareStatus() == EthernetNoHardware) {
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Serial.println("Ethernet shield was not found. Sorry, can't run without hardware. :(");
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while (true) {
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delay(1); // do nothing, no point running without Ethernet hardware
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}
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}
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if (Ethernet.linkStatus() == LinkOFF) {
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Serial.println("Ethernet cable is not connected.");
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}
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// try to configure using IP address instead of DHCP:
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Ethernet.begin(mac, ip, myDns);
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} else {
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Serial.print(" DHCP assigned IP ");
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Serial.println(Ethernet.localIP());
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}
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// give the Ethernet shield a second to initialize:
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delay(2000);
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Serial.print("connecting to ");
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Serial.print(server);
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Serial.println("...");
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// if you get a connection, report back via serial:
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auto start = millis();
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// specify the server and port, 443 is the standard port for HTTPS
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if (client.connect(server, 443)) {
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auto time = millis() - start;
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Serial.print("Took: ");
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Serial.println(time);
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// Make a HTTP request:
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client.println("GET /asciilogo.txt HTTP/1.1");
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client.println("User-Agent: SSLClientOverEthernet");
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client.print("Host: ");
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client.println(server_host);
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client.println("Connection: close");
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client.println();
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} else {
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// if you didn't get a connection to the server:
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Serial.println("connection failed");
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}
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beginMicros = micros();
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}
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void loop() {
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// if there are incoming bytes available
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// from the server, read them and print them:
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int len = client.available();
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if (len > 0) {
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byte buffer[80];
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if (len > 80) len = 80;
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client.read(buffer, len);
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if (printWebData) {
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Serial.write(buffer, len); // show in the serial monitor (slows some boards)
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}
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byteCount = byteCount + len;
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}
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// if the server's disconnected, stop the client:
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if (!client.connected()) {
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endMicros = micros();
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Serial.println();
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Serial.println("disconnecting.");
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client.stop();
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Serial.print("Received ");
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Serial.print(byteCount);
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Serial.print(" bytes in ");
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float seconds = (float)(endMicros - beginMicros) / 1000000.0;
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Serial.print(seconds, 4);
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float rate = (float)byteCount / seconds / 1000.0;
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Serial.print(", rate = ");
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Serial.print(rate);
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Serial.print(" kbytes/second");
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Serial.println();
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// do nothing forevermore:
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while (true) {
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delay(1);
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}
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}
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}
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