5.3.1 Execution

main.c – Initialize the ATWINC15x0 and download the file from the URL.

Code summary:

Configure the network parameters in main.h.

/** Wi-Fi Settings */
#define MAIN_WLAN_SSID                    "DEMO_AP" /**< Destination SSID */
#define MAIN_WLAN_AUTH                    M2M_WIFI_SEC_WPA_PSK /**< Security manner */
#define MAIN_WLAN_PSK                     "12345678" /**< Password for Destination SSID */

Configure the HTTP URL file to be downloaded into the SD card.

/** Content URI for download. */
#define MAIN_HTTP_FILE_URL        "http://www.atmel.com/Images/Atmel-42502-SmartConnect-WINC1500-MR210PB_Datasheet.pdf"

Configure the HTTP client.
```
configure_http_client();
```

Get the default config data and specify the user configuration. The http_client_init() and http_client_register_callback() functions execute sequentially.

static void configure_http_client(void)
{
    ...
    http_client_get_config_defaults(&httpc_conf);

    httpc_conf.recv_buffer_size = MAIN_BUFFER_MAX_SIZE;
    httpc_conf.timer_inst = &swt_module_inst;

    ret = http_client_init(&http_client_module_inst, &httpc_conf);
    if (ret < 0) {
	while (1) {
	} /* Loop forever. */
    }
    http_client_register_callback(&http_client_module_inst, http_client_callback);
}

Initialize the socket module and register the socket callback functions.
```
socketInit();
registerSocketCallback(socket_cb, resolve_cb);
```

Connect to the AP.

/* Connect to router. */
m2m_wifi_connect((char *)MAIN_WLAN_SSID, sizeof(MAIN_WLAN_SSID),
        MAIN_WLAN_AUTH, (char *)MAIN_WLAN_PSK, M2M_WIFI_CH_ALL);

After the device is connected to the AP, an HTTP request will be sent.

static void wifi_callback(uint8_t msg_type, void *msg_data)
{
    ...
    case M2M_WIFI_REQ_DHCP_CONF:
    {
        start_download();
    }

static void start_download(void)
{
    ...
    /* Send the HTTP request. */
    printf("start_download: sending HTTP request...\r\n");
    http_client_send_request(&http_client_module_inst, MAIN_HTTP_FILE_URL, HTTP_METHOD_GET, NULL, NULL);
}

Four operations will execute sequentially. The files are stored in the SD card when they are received by the HTTP request and the callback.

static void http_client_callback(...)
{
    switch (type) {
    case HTTP_CLIENT_CALLBACK_SOCK_CONNECTED:
        printf("Connected\r\n");
        break;
    case HTTP_CLIENT_CALLBACK_REQUESTED:
	printf("Request complete\r\n");
	break;
    case HTTP_CLIENT_CALLBACK_RECV_RESPONSE:		
        printf("http_client_callback: received response %u data size %u\r\n",
                (unsigned int)data->recv_response.response_code,
                (unsigned int)data->recv_response.content_length);
        if ((unsigned int)data->recv_response.response_code == 200) {
            http_file_size = data->recv_response.content_length;
            received_file_size = 0;
        } 
        if (data->recv_response.content_length <= MAIN_BUFFER_MAX_SIZE) {
            store_file_packet(data->recv_response.content, data->recv_response.content_length);                
        }
        break;
	case HTTP_CLIENT_CALLBACK_RECV_CHUNKED_DATA:
		store_file_packet(data->recv_chunked_data.data, data->recv_chunked_data.length);
	case HTTP_CLIENT_CALLBACK_DISCONNECTED:
		printf("Disconnected reason:%d\r\n", data->disconnected.reason);
		...
	}
}

The first sequence begins with the socket connected. After the request completes, the third sequence is executed and the file header is followed by the file data.

Build the program and download it into the board.
Start the application.

Note:

If the disconnect reason is equal to -ECONNRESET(-104), it means the server disconnected your connection due to the keep alive timeout. This operation is normal.
If the server connection is unstable, this example may not operate normally.

AN5305

5.3.1 Execution