Add source and examples

examples/FileDownload/FileDownload.ino

@@ -0,0 +1,153 @@
+/**************************************************************
+ *
+ * For this example, you need to install CRC32 library:
+ *   https://github.com/vshymanskyy/CRC32.git
+ *
+ * TinyGSM Getting Started guide:
+ *   http://tiny.cc/tiny-gsm-readme
+ *
+ **************************************************************/
+
+#include <TinyGsmClient.h>
+#include <CRC32.h>
+
+// Your GPRS credentials
+// Leave empty, if missing user or pass
+char apn[]  = "YourAPN";
+char user[] = "";
+char pass[] = "";
+
+// Use Hardware Serial on Mega, Leonardo, Micro
+#define GsmSerial Serial1
+
+// or Software Serial on Uno, Nano
+//#include <SoftwareSerial.h>
+//SoftwareSerial GsmSerial(2, 3); // RX, TX
+
+TinyGsmClient client(GsmSerial);
+
+char server[] = "cdn.rawgit.com";
+char resource[] = "/vshymanskyy/tinygsm/master/extras/test_10k.hex";
+uint32_t knownCRC32 = 0x54b3dcbf;
+uint32_t knownFileSize = 10240;   // In case server does not send it
+
+void setup() {
+  // Set console baud rate
+  Serial.begin(115200);
+  delay(10);
+
+  // Set GSM module baud rate
+  GsmSerial.begin(115200);
+  delay(3000);
+
+  // Restart takes quite some time
+  // You can skip it in many cases
+  Serial.println("Restarting modem...");
+  client.restart();
+}
+
+void printPercent(uint32_t readLength, uint32_t contentLength) {
+  // If we know the total length
+  if (contentLength != -1) {
+    Serial.print(String("\r ") + ((100.0 * readLength) / contentLength) + "%");
+  } else {
+    Serial.println(readLength);
+  }
+}
+
+void loop() {
+  Serial.print("Connecting to ");
+  Serial.print(apn);
+  if (!client.networkConnect(apn, user, pass)) {
+    Serial.println(" failed");
+    delay(10000);
+    return;
+  }
+  Serial.println(" OK");
+
+  Serial.print("Connecting to ");
+  Serial.print(server);
+
+  // if you get a connection, report back via serial:
+  if (!client.connect(server, 80)) {
+    Serial.println(" failed");
+    delay(10000);
+    return;
+  }
+  Serial.println(" OK");
+  // Make a HTTP request:
+  client.print(String("GET ") + resource + " HTTP/1.0\r\n");
+  client.print(String("Host: ") + server + "\r\n");
+  client.print("Connection: close\r\n\r\n");
+
+  long timeout = millis();
+  while (client.available() == 0) {
+    if (millis() - timeout > 5000L) {
+      Serial.println(">>> Client Timeout !");
+      client.stop();
+      delay(10000L);
+      return;
+    }
+  }
+
+  Serial.println("Reading response header");
+  uint32_t contentLength = knownFileSize;
+
+  while (client.available()) {
+    String line = client.readStringUntil('\n');
+    line.trim();
+    //Serial.println(line);    // Uncomment this to show response header
+    line.toLowerCase();
+    if (line.startsWith("content-length:")) {
+      contentLength = line.substring(line.lastIndexOf(':') + 1).toInt();  
+    } else if (line.length() == 0) {
+      break;
+    }
+  }
+
+  Serial.println("Reading response data");
+  timeout = millis();
+  uint32_t readLength = 0;
+  CRC32 crc;
+
+  unsigned long timeElapsed = millis();
+  printPercent(readLength, contentLength);
+  while (readLength < contentLength && client.connected() && millis() - timeout < 10000L) {
+    while (client.available()) {
+      uint8_t c = client.read();
+      //Serial.print((char)c);       // Uncomment this to show data
+      crc.update(c);
+      readLength++;
+      if (readLength % (contentLength / 13) == 0) {
+        printPercent(readLength, contentLength);
+      }
+      timeout = millis();
+    }
+  }
+  printPercent(readLength, contentLength);
+  timeElapsed = millis() - timeElapsed;
+  Serial.println();
+
+  client.stop();
+  Serial.println("Server disconnected");
+
+  client.networkDisconnect();
+  Serial.println("GPRS disconnected");
+  Serial.println();
+
+  float timeSpent = float(timeElapsed) / 1000;
+  float theorLimit = ((8.0 * readLength) / 85.6) / 1000;
+
+  Serial.print("Content-Length: ");   Serial.println(contentLength);
+  Serial.print("Actually read:  ");   Serial.println(readLength);
+  Serial.print("Calc. CRC32:    0x"); Serial.println(crc.finalize(), HEX);
+  Serial.print("Known CRC32:    0x"); Serial.println(knownCRC32, HEX);
+  Serial.print("Time spent:     ");   Serial.print(timeSpent); Serial.println("s");
+  Serial.print("85.6kBps limit: ");   Serial.print(theorLimit); Serial.println("s");
+
+  // Do nothing forevermore
+  while (true) {
+    delay(1000);
+  }
+}
+