ACKme
Host library for controlling a WiConnect enabled Wi-Fi module.
Dependents: wiconnect-ota_example wiconnect-web_setup_example wiconnect-test-console wiconnect-tcp_server_example ... more
doc/html/http_get_2example_8cpp-example.html
- Committer:
- dan_ackme
- Date:
- 2014-08-23
- Revision:
- 17:7268f365676b
- Parent:
- 16:7f1d6d359787
- Child:
- 21:17bb3eddcbae
File content as of revision 17:7268f365676b:
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WiConnect Host Library- API Reference Guide</td>
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<div class="title">http_get/example.cpp</div> </div>
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<p>This is an example of using the http socket API to download a webpage.</p>
<p>It works as follows:</p><ol type="1">
<li>Instantiate the WiConnect Library</li>
<li>Initiate Communication with WiFi Module</li>
<li>Issue a HTTP GET request (Note: The module must have valid network credentials See <a class="el" href="web_setup_2example_8cpp-example.html">web_setup/example.cpp</a>)</li>
<li>Read the HTTP page and print</li>
<li>That's it!</li>
</ol>
<div class="fragment"><div class="line"></div>
<div class="line"><span class="comment">/******************************************************************************</span></div>
<div class="line"><span class="comment"> * Example Variables</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// the URL of the webpage to GET</span></div>
<div class="line"><span class="preprocessor">#define HTTP_URL "http://ack.me"</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">/******************************************************************************</span></div>
<div class="line"><span class="comment"> * Includes</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// include C library headers</span></div>
<div class="line"><span class="preprocessor">#include <stdio.h></span> <span class="comment">// needed for printf</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// include target specific defines</span></div>
<div class="line"><span class="preprocessor">#include "target_config.h"</span></div>
<div class="line"><span class="comment">// include the Wiconnect Host Library API header</span></div>
<div class="line"><span class="preprocessor">#include "Wiconnect.h"</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">/******************************************************************************</span></div>
<div class="line"><span class="comment"> * Global Defines</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">// Serial used for printfs to terminal (i.e. NOT used for WiConnect)</span></div>
<div class="line"><span class="keyword">static</span> Serial consoleSerial(STDIO_UART_TX, STDIO_UART_RX);</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"></div>
<div class="line"><span class="comment">/******************************************************************************</span></div>
<div class="line"><span class="comment"> * Starting point of application</span></div>
<div class="line"><span class="comment"> */</span></div>
<div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
<div class="line">{</div>
<div class="line"> consoleSerial.baud(115200); <span class="comment">// console terminal to 115200 baud</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"> <span class="comment">// STEP 1: Instantiate WiConnect Library</span></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// Setup wiconnect serial interface configuration</span></div>
<div class="line"> <span class="comment">// Here we only specify the rx buffer size and not rx buffer pointer, this means</span></div>
<div class="line"> <span class="comment">// The serial RX buffer will be dynamically allocated</span></div>
<div class="line"> SerialConfig serialConfig(WICONNECT_RX_PIN, WICONNECT_TX_PIN, 256, NULL);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Instantiate and initialize the Wiconnect library</span></div>
<div class="line"> <span class="comment">// Here we only specify the buffer size and not buffer pointer, this means</span></div>
<div class="line"> <span class="comment">// The internal buffer will be dynamically allocated</span></div>
<div class="line"> Wiconnect wiconnect(serialConfig, 256, NULL, WICONNECT_RESET_PIN);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// set the default timeout to 15s as some websites take awhile to respond</span></div>
<div class="line"> wiconnect.setCommandDefaultTimeout(15000);</div>
<div class="line"></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"> <span class="comment">// STEP 2: Initiate Communication with WiFi Module</span></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"Initializing WiConnect Library...\r\n"</span>);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Initialize communication with WiFi module</span></div>
<div class="line"> <span class="keywordflow">if</span>(wiconnect.init(<span class="keyword">true</span>) != <a name="a0"></a><a class="code" href="group__api__core__types.html#gga325637ed501728bd6c8c7a7982b9ce05af0a2ad8af174aee6b52813d8528328e7">WICONNECT_SUCCESS</a>)</div>
<div class="line"> {</div>
<div class="line"> printf(<span class="stringliteral">"Failed to initialize communication with WiFi module!\r\n"</span></div>
<div class="line"> <span class="stringliteral">"Make sure the wires are connected correctly\r\n"</span>);</div>
<div class="line"> <span class="keywordflow">for</span>(;;); <span class="comment">// infinite loop</span></div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"> <span class="comment">// STEP 3: Issue a HTTP GET request</span></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line"> <span class="comment">// Initiate a socket with an RX buffer of 256 bytes</span></div>
<div class="line"> <span class="comment">// We're not specifying the rx buffer pointer so that means it's dynamically allocated</span></div>
<div class="line"> WiconnectSocket socket(256);</div>
<div class="line"></div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"Issuing HTTP Request: %s\r\n"</span>, HTTP_URL);</div>
<div class="line"></div>
<div class="line"> <span class="comment">// Issue HTTP request</span></div>
<div class="line"> <span class="comment">// NOTE: the module must have valid network credentials</span></div>
<div class="line"> <span class="keywordflow">if</span>(wiconnect.httpGet(socket, HTTP_URL) != <a class="code" href="group__api__core__types.html#gga325637ed501728bd6c8c7a7982b9ce05af0a2ad8af174aee6b52813d8528328e7">WICONNECT_SUCCESS</a>)</div>
<div class="line"> {</div>
<div class="line"> printf(<span class="stringliteral">"Failed to issue HTTP request. Does the module have valid network credentials?\r\n"</span>);</div>
<div class="line"> <span class="keywordflow">for</span>(;;); <span class="comment">// infinite loop</span></div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"> <span class="comment">// STEP 4: Read the HTTP page and print</span></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line"> uint8_t *dataPtr;</div>
<div class="line"> uint16_t dataLength;</div>
<div class="line"></div>
<div class="line"> <span class="comment">// while there's data to read, retreive and print it</span></div>
<div class="line"> <span class="keywordflow">while</span>(socket.read(&dataPtr, &dataLength) == <a class="code" href="group__api__core__types.html#gga325637ed501728bd6c8c7a7982b9ce05af0a2ad8af174aee6b52813d8528328e7">WICONNECT_SUCCESS</a>)</div>
<div class="line"> {</div>
<div class="line"> fwrite(dataPtr, 1, dataLength, stdout);</div>
<div class="line"> }</div>
<div class="line"></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"> <span class="comment">// STEP 5: Done!</span></div>
<div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line"> printf(<span class="stringliteral">"HTTP GET example has completed!\r\n"</span>);</div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">for</span>(;;); <span class="comment">// infinite loop</span></div>
<div class="line"></div>
<div class="line"> <span class="keywordflow">return</span> 0;</div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"></div>
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| Type: | Library |
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| Created: | 11 Aug 2014 |
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