Save data on Dropbox with W5100 EthernetShield

Hi,

I would like to save files from my SD card on W5100 EthernetShield on Dropbox but I receive an error (see doc file) with HTTP request.

#include <SPI.h>
#include <Ethernet.h>

byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };    // BIA or Physical mac address of W5100 Shield
byte ip[] = { 192, 168, 1, 100 };                       // IP ADDRESS of your device
byte gateway[] = { 192, 168, 1, 1 };                   // internet access via router
byte subnet[] = { 255, 255, 255, 0 };                  // 24bit Subnet Mask   
 
// Initialize Ethernet Client
EthernetClient client;

void setup()
{
  Serial.begin(9600);
  Ethernet.begin(mac, ip, gateway, subnet);
  startEthernet();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
}
 
void loop()
{  
  //  DROPBOX
  String PostData = "someDataToPost";
  if (client.connect("content.dropboxapi.com", 80)) 
  {
    Serial.println("connected");
    client.println("POST https://content.dropboxapi.com/2/files/upload");
    client.println("Authorization: Bearer MY_TOKEN ");
    client.println("Dropbox-API-Arg: {\"path\": \"/Matrices.txt\",\"mode\": \"add\",\"autorename\": true,\"mute\": false}");
    client.println("Content-Type: application/octet-stream");
    client.println("Host: content.dropboxapi.com");
    client.println(PostData);  
    client.println("Connection: close");
    client.println();
    client.flush();

    delay(5000);
    Serial.println("Response from Dropbox API:");
    while (client.available() != 0) {
        Serial.print((char)client.read());
    }
 
     delay(1000);
     client.stop();
  }
  else {
    Serial.println("Couldn't connect to Dropbox API");  
  }
  delay(1000); 
}

 
void startEthernet()
{     
  Serial.println("Connecting to current network please wait...");
  Serial.println();  
 
  delay(1000);
  
  // Connect to network amd obtain an IP address using DHCP   
  if (Ethernet.begin(mac) == 0)
  {
    Serial.println("DHCP Failed, reset the device and try again");
    Serial.println();
  }
  else
  {
    Serial.println("Connected to network w/d DHCP"); 
    Serial.println();
  }  
  delay(1000); // Delay at 1 Seconds
}

Please can you advise me where is a problem?

Thank you very much,

Jan

Error.doc (24.5 KB)

Error.doc (24.5 KB)

Error.doc (24.5 KB)

your problem is https. secure connection requiers more computing power then an 8-bit avr mcu