ACKme / WiConnect

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@17:7268f365676b, 2014-08-23 (annotated)

Committer:
dan_ackme
Date:
Sat Aug 23 05:39:17 2014 -0700
Revision:
17:7268f365676b
Parent:
16:7f1d6d359787
Child:
21:17bb3eddcbae
Fixes and documentation updates

Who changed what in which revision?

UserRevisionLine numberNew contents of line
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dan_ackme 14:85a2ed029f37 30 <tr style="height:20px"><td>&nbsp;</td></tr>
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dan_ackme 14:85a2ed029f37 35 WiConnect Host Library- API Reference Guide</td>
dan_ackme 14:85a2ed029f37 36 <td style="width:20px"></td>
dan_ackme 14:85a2ed029f37 37 </tr>
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dan_ackme 14:85a2ed029f37 46 <li><a href="index.html"><span>Library&#160;Overview</span></a></li>
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dan_ackme 14:85a2ed029f37 48 <li><a href="examples.html"><span>API&#160;Examples</span></a></li>
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dan_ackme 14:85a2ed029f37 50 <li><a href="http://wiconnect.ack.me/1.2/general_overview"><span>WiConnect&#160;Reference&#160;Manual</span></a></li>
dan_ackme 14:85a2ed029f37 51 <li><a href="http://www.ack.me/WiConnect"><span>ACKme&#160;Website</span></a></li>
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dan_ackme 14:85a2ed029f37 98
dan_ackme 14:85a2ed029f37 99 <div class="header">
dan_ackme 14:85a2ed029f37 100 <div class="headertitle">
dan_ackme 14:85a2ed029f37 101 <div class="title">http_get/example.cpp</div> </div>
dan_ackme 14:85a2ed029f37 102 </div><!--header-->
dan_ackme 14:85a2ed029f37 103 <div class="contents">
dan_ackme 14:85a2ed029f37 104 <p>This is an example of using the http socket API to download a webpage.</p>
dan_ackme 14:85a2ed029f37 105 <p>It works as follows:</p><ol type="1">
dan_ackme 14:85a2ed029f37 106 <li>Instantiate the WiConnect Library</li>
dan_ackme 14:85a2ed029f37 107 <li>Initiate Communication with WiFi Module</li>
dan_ackme 14:85a2ed029f37 108 <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>
dan_ackme 14:85a2ed029f37 109 <li>Read the HTTP page and print</li>
dan_ackme 14:85a2ed029f37 110 <li>That's it!</li>
dan_ackme 14:85a2ed029f37 111 </ol>
dan_ackme 14:85a2ed029f37 112 <div class="fragment"><div class="line"></div>
dan_ackme 14:85a2ed029f37 113 <div class="line"><span class="comment">/******************************************************************************</span></div>
dan_ackme 14:85a2ed029f37 114 <div class="line"><span class="comment"> * Example Variables</span></div>
dan_ackme 14:85a2ed029f37 115 <div class="line"><span class="comment"> */</span></div>
dan_ackme 14:85a2ed029f37 116 <div class="line"></div>
dan_ackme 14:85a2ed029f37 117 <div class="line"><span class="comment">// the URL of the webpage to GET</span></div>
dan_ackme 14:85a2ed029f37 118 <div class="line"><span class="preprocessor">#define HTTP_URL &quot;http://ack.me&quot;</span></div>
dan_ackme 14:85a2ed029f37 119 <div class="line"></div>
dan_ackme 14:85a2ed029f37 120 <div class="line"></div>
dan_ackme 14:85a2ed029f37 121 <div class="line"></div>
dan_ackme 14:85a2ed029f37 122 <div class="line"></div>
dan_ackme 14:85a2ed029f37 123 <div class="line"></div>
dan_ackme 14:85a2ed029f37 124 <div class="line"><span class="comment">/******************************************************************************</span></div>
dan_ackme 14:85a2ed029f37 125 <div class="line"><span class="comment"> * Includes</span></div>
dan_ackme 14:85a2ed029f37 126 <div class="line"><span class="comment"> */</span></div>
dan_ackme 14:85a2ed029f37 127 <div class="line"></div>
dan_ackme 14:85a2ed029f37 128 <div class="line"><span class="comment">// include C library headers</span></div>
dan_ackme 14:85a2ed029f37 129 <div class="line"><span class="preprocessor">#include &lt;stdio.h&gt;</span> <span class="comment">// needed for printf</span></div>
dan_ackme 14:85a2ed029f37 130 <div class="line"></div>
dan_ackme 14:85a2ed029f37 131 <div class="line"><span class="comment">// include target specific defines</span></div>
dan_ackme 14:85a2ed029f37 132 <div class="line"><span class="preprocessor">#include &quot;target_config.h&quot;</span></div>
dan_ackme 14:85a2ed029f37 133 <div class="line"><span class="comment">// include the Wiconnect Host Library API header</span></div>
dan_ackme 14:85a2ed029f37 134 <div class="line"><span class="preprocessor">#include &quot;Wiconnect.h&quot;</span></div>
dan_ackme 14:85a2ed029f37 135 <div class="line"></div>
dan_ackme 14:85a2ed029f37 136 <div class="line"></div>
dan_ackme 14:85a2ed029f37 137 <div class="line"></div>
dan_ackme 14:85a2ed029f37 138 <div class="line"></div>
dan_ackme 14:85a2ed029f37 139 <div class="line"><span class="comment">/******************************************************************************</span></div>
dan_ackme 14:85a2ed029f37 140 <div class="line"><span class="comment"> * Global Defines</span></div>
dan_ackme 14:85a2ed029f37 141 <div class="line"><span class="comment"> */</span></div>
dan_ackme 14:85a2ed029f37 142 <div class="line"></div>
dan_ackme 14:85a2ed029f37 143 <div class="line"></div>
dan_ackme 14:85a2ed029f37 144 <div class="line"><span class="comment">// Serial used for printfs to terminal (i.e. NOT used for WiConnect)</span></div>
dan_ackme 14:85a2ed029f37 145 <div class="line"><span class="keyword">static</span> Serial consoleSerial(STDIO_UART_TX, STDIO_UART_RX);</div>
dan_ackme 14:85a2ed029f37 146 <div class="line"></div>
dan_ackme 14:85a2ed029f37 147 <div class="line"></div>
dan_ackme 14:85a2ed029f37 148 <div class="line"></div>
dan_ackme 14:85a2ed029f37 149 <div class="line"><span class="comment">/******************************************************************************</span></div>
dan_ackme 14:85a2ed029f37 150 <div class="line"><span class="comment"> * Starting point of application</span></div>
dan_ackme 14:85a2ed029f37 151 <div class="line"><span class="comment"> */</span></div>
dan_ackme 14:85a2ed029f37 152 <div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
dan_ackme 14:85a2ed029f37 153 <div class="line">{</div>
dan_ackme 14:85a2ed029f37 154 <div class="line"> consoleSerial.baud(115200); <span class="comment">// console terminal to 115200 baud</span></div>
dan_ackme 14:85a2ed029f37 155 <div class="line"></div>
dan_ackme 14:85a2ed029f37 156 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 157 <div class="line"> <span class="comment">// STEP 1: Instantiate WiConnect Library</span></div>
dan_ackme 14:85a2ed029f37 158 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 159 <div class="line"></div>
dan_ackme 14:85a2ed029f37 160 <div class="line"> <span class="comment">// Setup wiconnect serial interface configuration</span></div>
dan_ackme 14:85a2ed029f37 161 <div class="line"> <span class="comment">// Here we only specify the rx buffer size and not rx buffer pointer, this means</span></div>
dan_ackme 14:85a2ed029f37 162 <div class="line"> <span class="comment">// The serial RX buffer will be dynamically allocated</span></div>
dan_ackme 16:7f1d6d359787 163 <div class="line"> SerialConfig serialConfig(WICONNECT_RX_PIN, WICONNECT_TX_PIN, 256, NULL);</div>
dan_ackme 14:85a2ed029f37 164 <div class="line"></div>
dan_ackme 14:85a2ed029f37 165 <div class="line"> <span class="comment">// Instantiate and initialize the Wiconnect library</span></div>
dan_ackme 14:85a2ed029f37 166 <div class="line"> <span class="comment">// Here we only specify the buffer size and not buffer pointer, this means</span></div>
dan_ackme 14:85a2ed029f37 167 <div class="line"> <span class="comment">// The internal buffer will be dynamically allocated</span></div>
dan_ackme 16:7f1d6d359787 168 <div class="line"> Wiconnect wiconnect(serialConfig, 256, NULL, WICONNECT_RESET_PIN);</div>
dan_ackme 14:85a2ed029f37 169 <div class="line"></div>
dan_ackme 14:85a2ed029f37 170 <div class="line"> <span class="comment">// set the default timeout to 15s as some websites take awhile to respond</span></div>
dan_ackme 14:85a2ed029f37 171 <div class="line"> wiconnect.setCommandDefaultTimeout(15000);</div>
dan_ackme 14:85a2ed029f37 172 <div class="line"></div>
dan_ackme 14:85a2ed029f37 173 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 174 <div class="line"> <span class="comment">// STEP 2: Initiate Communication with WiFi Module</span></div>
dan_ackme 14:85a2ed029f37 175 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 176 <div class="line"></div>
dan_ackme 14:85a2ed029f37 177 <div class="line"> printf(<span class="stringliteral">&quot;Initializing WiConnect Library...\r\n&quot;</span>);</div>
dan_ackme 14:85a2ed029f37 178 <div class="line"></div>
dan_ackme 14:85a2ed029f37 179 <div class="line"> <span class="comment">// Initialize communication with WiFi module</span></div>
dan_ackme 14:85a2ed029f37 180 <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>
dan_ackme 14:85a2ed029f37 181 <div class="line"> {</div>
dan_ackme 14:85a2ed029f37 182 <div class="line"> printf(<span class="stringliteral">&quot;Failed to initialize communication with WiFi module!\r\n&quot;</span></div>
dan_ackme 14:85a2ed029f37 183 <div class="line"> <span class="stringliteral">&quot;Make sure the wires are connected correctly\r\n&quot;</span>);</div>
dan_ackme 14:85a2ed029f37 184 <div class="line"> <span class="keywordflow">for</span>(;;); <span class="comment">// infinite loop</span></div>
dan_ackme 14:85a2ed029f37 185 <div class="line"> }</div>
dan_ackme 14:85a2ed029f37 186 <div class="line"></div>
dan_ackme 14:85a2ed029f37 187 <div class="line"></div>
dan_ackme 14:85a2ed029f37 188 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 189 <div class="line"> <span class="comment">// STEP 3: Issue a HTTP GET request</span></div>
dan_ackme 14:85a2ed029f37 190 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 191 <div class="line"></div>
dan_ackme 16:7f1d6d359787 192 <div class="line"> <span class="comment">// Initiate a socket with an RX buffer of 256 bytes</span></div>
dan_ackme 14:85a2ed029f37 193 <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>
dan_ackme 17:7268f365676b 194 <div class="line"> WiconnectSocket socket(256);</div>
dan_ackme 14:85a2ed029f37 195 <div class="line"></div>
dan_ackme 14:85a2ed029f37 196 <div class="line"></div>
dan_ackme 14:85a2ed029f37 197 <div class="line"> printf(<span class="stringliteral">&quot;Issuing HTTP Request: %s\r\n&quot;</span>, HTTP_URL);</div>
dan_ackme 14:85a2ed029f37 198 <div class="line"></div>
dan_ackme 14:85a2ed029f37 199 <div class="line"> <span class="comment">// Issue HTTP request</span></div>
dan_ackme 14:85a2ed029f37 200 <div class="line"> <span class="comment">// NOTE: the module must have valid network credentials</span></div>
dan_ackme 14:85a2ed029f37 201 <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>
dan_ackme 14:85a2ed029f37 202 <div class="line"> {</div>
dan_ackme 14:85a2ed029f37 203 <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>
dan_ackme 14:85a2ed029f37 204 <div class="line"> <span class="keywordflow">for</span>(;;); <span class="comment">// infinite loop</span></div>
dan_ackme 14:85a2ed029f37 205 <div class="line"> }</div>
dan_ackme 14:85a2ed029f37 206 <div class="line"></div>
dan_ackme 14:85a2ed029f37 207 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 208 <div class="line"> <span class="comment">// STEP 4: Read the HTTP page and print</span></div>
dan_ackme 14:85a2ed029f37 209 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 210 <div class="line"></div>
dan_ackme 14:85a2ed029f37 211 <div class="line"> uint8_t *dataPtr;</div>
dan_ackme 14:85a2ed029f37 212 <div class="line"> uint16_t dataLength;</div>
dan_ackme 14:85a2ed029f37 213 <div class="line"></div>
dan_ackme 14:85a2ed029f37 214 <div class="line"> <span class="comment">// while there&#39;s data to read, retreive and print it</span></div>
dan_ackme 14:85a2ed029f37 215 <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>
dan_ackme 14:85a2ed029f37 216 <div class="line"> {</div>
dan_ackme 14:85a2ed029f37 217 <div class="line"> fwrite(dataPtr, 1, dataLength, stdout);</div>
dan_ackme 14:85a2ed029f37 218 <div class="line"> }</div>
dan_ackme 14:85a2ed029f37 219 <div class="line"></div>
dan_ackme 14:85a2ed029f37 220 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 221 <div class="line"> <span class="comment">// STEP 5: Done!</span></div>
dan_ackme 14:85a2ed029f37 222 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 14:85a2ed029f37 223 <div class="line"></div>
dan_ackme 14:85a2ed029f37 224 <div class="line"> printf(<span class="stringliteral">&quot;HTTP GET example has completed!\r\n&quot;</span>);</div>
dan_ackme 14:85a2ed029f37 225 <div class="line"></div>
dan_ackme 14:85a2ed029f37 226 <div class="line"> <span class="keywordflow">for</span>(;;); <span class="comment">// infinite loop</span></div>
dan_ackme 14:85a2ed029f37 227 <div class="line"></div>
dan_ackme 14:85a2ed029f37 228 <div class="line"> <span class="keywordflow">return</span> 0;</div>
dan_ackme 14:85a2ed029f37 229 <div class="line">}</div>
dan_ackme 14:85a2ed029f37 230 <div class="line"></div>
dan_ackme 14:85a2ed029f37 231 <div class="line"></div>
dan_ackme 14:85a2ed029f37 232 </div><!-- fragment --> </div><!-- contents -->
dan_ackme 14:85a2ed029f37 233 </div><!-- doc-content -->
dan_ackme 14:85a2ed029f37 234 <div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
dan_ackme 14:85a2ed029f37 235 <ul>
dan_ackme 14:85a2ed029f37 236 <li class="footer">&copy; ACKme Networks 2014</li>
dan_ackme 14:85a2ed029f37 237 </ul>
dan_ackme 14:85a2ed029f37 238 </div>
dan_ackme 14:85a2ed029f37 239 </body>
dan_ackme 14:85a2ed029f37 240 </html>