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libraries/Blynk/examples/Boards_With_HTTP_API/Arduino_Ethernet/Arduino_Ethernet.ino

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+/*************************************************************
+  Blynk is a platform with iOS and Android apps to control
+  ESP32, Arduino, Raspberry Pi and the likes over the Internet.
+  You can easily build mobile and web interfaces for any
+  projects by simply dragging and dropping widgets.
+
+    Downloads, docs, tutorials: https://www.blynk.io
+    Sketch generator:           https://examples.blynk.cc
+    Blynk community:            https://community.blynk.cc
+    Follow us:                  https://www.fb.com/blynkapp
+                                https://twitter.com/blynk_app
+
+  This example code is in public domain.
+
+ *************************************************************
+  App dashboard setup:
+    Value Display widget on V2
+
+  NOTE: Pins 10, 11, 12 and 13 are reserved for Ethernet module.
+        DON'T use them in your sketch directly!
+
+  WARNING: If you have an SD card, you may need to disable it
+        by setting pin 4 to HIGH. Read more here:
+        https://www.arduino.cc/en/Main/ArduinoEthernetShield
+
+ *************************************************************/
+
+#include <SPI.h>
+#include <Ethernet.h>
+
+/* Fill in information from Blynk Device Info here */
+//#define BLYNK_TEMPLATE_ID           "TMPxxxxxx"
+//#define BLYNK_TEMPLATE_NAME         "Device"
+//#define BLYNK_AUTH_TOKEN            "YourAuthToken"
+
+// Blynk cloud server
+const char* host = "blynk.cloud";
+unsigned int port = 80;
+
+// Network settings
+byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
+
+EthernetClient client;
+
+#define W5100_CS  10
+#define SDCARD_CS 4
+
+// Start the Ethernet connection
+void connectNetwork()
+{
+  Serial.println("Connecting to Ethernet...");
+  pinMode(SDCARD_CS, OUTPUT);
+  digitalWrite(SDCARD_CS, HIGH); // Deselect the SD card
+
+  if (Ethernet.begin(mac) == 0) {
+    Serial.println("Failed to configure Ethernet using DHCP");
+    while (true);
+  }
+
+  // Give the Ethernet shield a second to initialize
+  delay(1000);
+  Serial.println("Ethernet connected");
+}
+
+bool httpRequest(const String& method,
+                 const String& url,
+                 const String& request,
+                 String&       response)
+{
+  Serial.print(F("Connecting to "));
+  Serial.print(host);
+  Serial.print(":");
+  Serial.print(port);
+  Serial.print("... ");
+  if (client.connect(host, port)) {
+    Serial.println("OK");
+  } else {
+    Serial.println("failed");
+    return false;
+  }
+
+  Serial.print(method); Serial.print(" "); Serial.println(url);
+
+  client.print(method); client.print(" ");
+  client.print(url); client.println(F(" HTTP/1.1"));
+  client.print(F("Host: ")); client.println(host);
+  client.println(F("Connection: close"));
+  if (request.length()) {
+    client.println(F("Content-Type: application/json"));
+    client.print(F("Content-Length: ")); client.println(request.length());
+    client.println();
+    client.print(request);
+  } else {
+    client.println();
+  }
+
+  //Serial.println("Waiting response");
+  int timeout = millis() + 5000;
+  while (client.available() == 0) {
+    if (timeout - millis() < 0) {
+      Serial.println(">>> Client Timeout !");
+      client.stop();
+      return false;
+    }
+  }
+
+  //Serial.println("Reading response");
+  int contentLength = -1;
+  while (client.available()) {
+    String line = client.readStringUntil('\n');
+    line.trim();
+    line.toLowerCase();
+    if (line.startsWith("content-length:")) {
+      contentLength = line.substring(line.lastIndexOf(':') + 1).toInt();
+    } else if (line.length() == 0) {
+      break;
+    }
+  }
+
+  //Serial.println("Reading response body");
+  response = "";
+  response.reserve(contentLength + 1);
+  while (response.length() < contentLength) {
+    if (client.available()) {
+      char c = client.read();
+      response += c;
+    } else if (!client.connected()) {
+      break;
+    }
+  }
+  client.stop();
+  return true;
+}
+
+void setup()
+{
+  Serial.begin(9600);
+  delay(10);
+  Serial.println();
+  Serial.println();
+
+  connectNetwork();
+}
+
+void loop() {
+  String response;
+
+  unsigned long value = millis();
+
+  // Send value to the cloud
+  // similar to Blynk.virtualWrite()
+
+  Serial.print("Sending value: ");
+  Serial.println(value);
+
+  if (httpRequest("GET", String("/external/api/update?token=") + BLYNK_AUTH_TOKEN + "&pin=V2&value=" + value, "", response)) {
+    if (response.length() != 0) {
+      Serial.print("WARNING: ");
+      Serial.println(response);
+    }
+  }
+
+  // Read the value back
+  // similar to Blynk.syncVirtual()
+
+  Serial.println("Reading value");
+
+  if (httpRequest("GET", String("/external/api/get?token=") + BLYNK_AUTH_TOKEN + "&pin=V2", "", response)) {
+    Serial.print("Value from server: ");
+    Serial.println(response);
+  }
+
+  // Set Property
+  Serial.println("Setting property");
+
+  if (httpRequest("GET", String("/external/api/update/property?token=") + BLYNK_AUTH_TOKEN + "&pin=V2&label=" + value, "", response)) {
+    if (response.length() != 0) {
+      Serial.print("WARNING: ");
+      Serial.println(response);
+    }
+  }
+
+  // For more HTTP API, see https://docs.blynk.io/en/blynk.cloud/https-api-overview
+
+  // Wait
+  delay(30000L);
+}
+