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/mbed/html/http_get_2example_8cpp-example.html

Committer:
dan_ackme
Date:
2014-11-26
Revision:
34:2616445d0823
Child:
39:a963f69cb2de

File content as of revision 34:2616445d0823:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<title>ACKme WiConnect Host Library</title>
<link rel="icon" href="favicon.ico" type="image/x-icon">
<link rel="shortcut icon" href="favicon.ico" type="image/x-icon">
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
  $(document).ready(initResizable);
  $(window).load(resizeHeight);
</script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
  $(document).ready(function() { searchBox.OnSelectItem(0); });
</script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea" style="font-family:verdana;">
    <table border='0' cellpadding='0' cellspacing='0' width="98%">
      <tr style="height:20px"><td>&nbsp;</td></tr>
      <tr style="border-collapse: collapse; padding: 0;">
        <td style="width:20px"></td>
        <td style="padding-right:40px"><img src="ackmelogo.png" alt="ACKme Logo" /></td>
        <td style="vertical-align:middle; text-align:left; font: bold 25px/100% Verdana, Arial, Helvetica, sans-serif;">
        WiConnect Host Library- API Reference Guide</td>
        <td style="width:20px"></td>
      </tr>
      <tr><td>&nbsp;</td></tr>
    </table>
</div><!-- Generated by Doxygen 1.8.7 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
  <div id="navrow1" class="tabs">
    <ul class="tablist">
      <li><a href="index.html"><span>Library&#160;Overview</span></a></li>
      <li><a href="modules.html"><span>Library&#160;API</span></a></li>
      <li><a href="examples.html"><span>API&#160;Examples</span></a></li>
      <li><a href="annotated.html"><span>Classes</span></a></li>
      <li><a href="http://wiconnect.ack.me/2.0/general_overview"><span>WiConnect&#160;Reference&#160;Manual</span></a></li>
      <li><a href="http://www.ack.me/WiConnect"><span>ACKme&#160;Website</span></a></li>
      <li><a href="http://developer.mbed.org/teams/ACKme/code/WiConnect/"><span>WiConnect&#160;Repository</span></a></li>
      <li>
        <div id="MSearchBox" class="MSearchBoxInactive">
        <span class="left">
          <img id="MSearchSelect" src="search/mag_sel.png"
               onmouseover="return searchBox.OnSearchSelectShow()"
               onmouseout="return searchBox.OnSearchSelectHide()"
               alt=""/>
          <input type="text" id="MSearchField" value="Search" accesskey="S"
               onfocus="searchBox.OnSearchFieldFocus(true)" 
               onblur="searchBox.OnSearchFieldFocus(false)" 
               onkeyup="searchBox.OnSearchFieldChange(event)"/>
          </span><span class="right">
            <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
          </span>
        </div>
      </li>
    </ul>
  </div>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
  <div id="nav-tree">
    <div id="nav-tree-contents">
      <div id="nav-sync" class="sync"></div>
    </div>
  </div>
  <div id="splitbar" style="-moz-user-select:none;" 
       class="ui-resizable-handle">
  </div>
</div>
<script type="text/javascript">
$(document).ready(function(){initNavTree('http_get_2example_8cpp-example.html','');});
</script>
<div id="doc-content">
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark">&#160;</span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark">&#160;</span>Classes</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark">&#160;</span>Namespaces</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark">&#160;</span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark">&#160;</span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark">&#160;</span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark">&#160;</span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark">&#160;</span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark">&#160;</span>Groups</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(9)"><span class="SelectionMark">&#160;</span>Pages</a></div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>

<div class="header">
  <div class="headertitle">
<div class="title">http_get/example.cpp</div>  </div>
</div><!--header-->
<div class="contents">
<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 &quot;http://ack.me&quot;</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 &lt;stdio.h&gt;</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 &quot;target_config.h&quot;</span></div>
<div class="line"><span class="comment">// include the Wiconnect Host Library API header</span></div>
<div class="line"><span class="preprocessor">#include &quot;Wiconnect.h&quot;</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">&quot;Initializing WiConnect Library...\r\n&quot;</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">        <span class="keywordflow">if</span>(result == <a name="a1"></a><a class="code" href="group__api__core__types.html#gga325637ed501728bd6c8c7a7982b9ce05a62defbdafd472461054dd6bb888c9a1e">WICONNECT_FIRMWARE_OUTDATED</a>)</div>
<div class="line">        {</div>
<div class="line">            printf(<span class="stringliteral">&quot;The WiFi firmware is not supported. Run the ota example to update the firmware:\r\n&quot;</span>);</div>
<div class="line">            printf(<span class="stringliteral">&quot;https://developer.mbed.org/teams/ACKme/code/wiconnect-ota_example&quot;</span>);</div>
<div class="line">        }</div>
<div class="line">        <span class="keywordflow">else</span></div>
<div class="line">        {</div>
<div class="line">            printf(<span class="stringliteral">&quot;Failed to initialize communication with WiFi module!\r\n&quot;</span></div>
<div class="line">                   <span class="stringliteral">&quot;Make sure the wires are connected correctly\r\n&quot;</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"></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&#39;re not specifying the rx buffer pointer so that means it&#39;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">&quot;Issuing HTTP Request: %s\r\n&quot;</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">&quot;Failed to issue HTTP request. Does the module have valid network credentials?\r\n&quot;</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&#39;s data to read, retreive and print it</span></div>
<div class="line">    <span class="keywordflow">while</span>(socket.read(&amp;dataPtr, &amp;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">&quot;HTTP GET example has completed!\r\n&quot;</span>);</div>
<div class="line"></div>
<div class="line">    <span class="keywordflow">while</span>(<span class="keyword">true</span>){} <span class="comment">// infinite loop</span></div>
<div class="line">}</div>
<div class="line"></div>
<div class="line"></div>
</div><!-- fragment --> </div><!-- contents -->
</div><!-- doc-content -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
  <ul>
    <li class="footer">&copy; ACKme Networks 2014</li>
  </ul>
</div>
</body>
</html>