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/mbed/html/http_get_2example_8cpp-example.html@42:8ffb253b09e7, 2015-09-28 (annotated)

Committer:
aymangrais
Date:
Mon Sep 28 03:38:43 2015 +0000
Revision:
42:8ffb253b09e7
Parent:
34:2616445d0823
Child:
39:a963f69cb2de
increase ota timeout to be 5 seconds (instead of 1.5 sec)

Who changed what in which revision?

UserRevisionLine numberNew contents of line
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dan_ackme 34:2616445d0823 35 WiConnect Host Library- API Reference Guide</td>
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dan_ackme 34:2616445d0823 37 </tr>
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dan_ackme 34:2616445d0823 100 <div class="header">
dan_ackme 34:2616445d0823 101 <div class="headertitle">
dan_ackme 34:2616445d0823 102 <div class="title">http_get/example.cpp</div> </div>
dan_ackme 34:2616445d0823 103 </div><!--header-->
dan_ackme 34:2616445d0823 104 <div class="contents">
dan_ackme 34:2616445d0823 105 <p>This is an example of using the http socket API to download a webpage.</p>
dan_ackme 34:2616445d0823 106 <p>It works as follows:</p><ol type="1">
dan_ackme 34:2616445d0823 107 <li>Instantiate the WiConnect Library</li>
dan_ackme 34:2616445d0823 108 <li>Initiate Communication with WiFi Module</li>
dan_ackme 34:2616445d0823 109 <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 34:2616445d0823 110 <li>Read the HTTP page and print</li>
dan_ackme 34:2616445d0823 111 <li>That's it!</li>
dan_ackme 34:2616445d0823 112 </ol>
dan_ackme 34:2616445d0823 113 <div class="fragment"><div class="line"></div>
dan_ackme 34:2616445d0823 114 <div class="line"><span class="comment">/******************************************************************************</span></div>
dan_ackme 34:2616445d0823 115 <div class="line"><span class="comment"> * Example Variables</span></div>
dan_ackme 34:2616445d0823 116 <div class="line"><span class="comment"> */</span></div>
dan_ackme 34:2616445d0823 117 <div class="line"></div>
dan_ackme 34:2616445d0823 118 <div class="line"><span class="comment">// the URL of the webpage to GET</span></div>
dan_ackme 34:2616445d0823 119 <div class="line"><span class="preprocessor">#define HTTP_URL &quot;http://ack.me&quot;</span></div>
dan_ackme 34:2616445d0823 120 <div class="line"></div>
dan_ackme 34:2616445d0823 121 <div class="line"></div>
dan_ackme 34:2616445d0823 122 <div class="line"></div>
dan_ackme 34:2616445d0823 123 <div class="line"></div>
dan_ackme 34:2616445d0823 124 <div class="line"></div>
dan_ackme 34:2616445d0823 125 <div class="line"><span class="comment">/******************************************************************************</span></div>
dan_ackme 34:2616445d0823 126 <div class="line"><span class="comment"> * Includes</span></div>
dan_ackme 34:2616445d0823 127 <div class="line"><span class="comment"> */</span></div>
dan_ackme 34:2616445d0823 128 <div class="line"></div>
dan_ackme 34:2616445d0823 129 <div class="line"><span class="comment">// include C library headers</span></div>
dan_ackme 34:2616445d0823 130 <div class="line"><span class="preprocessor">#include &lt;stdio.h&gt;</span> <span class="comment">// needed for printf</span></div>
dan_ackme 34:2616445d0823 131 <div class="line"></div>
dan_ackme 34:2616445d0823 132 <div class="line"><span class="comment">// include target specific defines</span></div>
dan_ackme 34:2616445d0823 133 <div class="line"><span class="preprocessor">#include &quot;target_config.h&quot;</span></div>
dan_ackme 34:2616445d0823 134 <div class="line"><span class="comment">// include the Wiconnect Host Library API header</span></div>
dan_ackme 34:2616445d0823 135 <div class="line"><span class="preprocessor">#include &quot;Wiconnect.h&quot;</span></div>
dan_ackme 34:2616445d0823 136 <div class="line"></div>
dan_ackme 34:2616445d0823 137 <div class="line"></div>
dan_ackme 34:2616445d0823 138 <div class="line"></div>
dan_ackme 34:2616445d0823 139 <div class="line"></div>
dan_ackme 34:2616445d0823 140 <div class="line"><span class="comment">/******************************************************************************</span></div>
dan_ackme 34:2616445d0823 141 <div class="line"><span class="comment"> * Global Defines</span></div>
dan_ackme 34:2616445d0823 142 <div class="line"><span class="comment"> */</span></div>
dan_ackme 34:2616445d0823 143 <div class="line"></div>
dan_ackme 34:2616445d0823 144 <div class="line"></div>
dan_ackme 34:2616445d0823 145 <div class="line"><span class="comment">// Serial used for printfs to terminal (i.e. NOT used for WiConnect)</span></div>
dan_ackme 34:2616445d0823 146 <div class="line"><span class="keyword">static</span> Serial consoleSerial(STDIO_UART_TX, STDIO_UART_RX);</div>
dan_ackme 34:2616445d0823 147 <div class="line"></div>
dan_ackme 34:2616445d0823 148 <div class="line"></div>
dan_ackme 34:2616445d0823 149 <div class="line"></div>
dan_ackme 34:2616445d0823 150 <div class="line"><span class="comment">/******************************************************************************</span></div>
dan_ackme 34:2616445d0823 151 <div class="line"><span class="comment"> * Starting point of application</span></div>
dan_ackme 34:2616445d0823 152 <div class="line"><span class="comment"> */</span></div>
dan_ackme 34:2616445d0823 153 <div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> **argv)</div>
dan_ackme 34:2616445d0823 154 <div class="line">{</div>
dan_ackme 34:2616445d0823 155 <div class="line"> consoleSerial.baud(115200); <span class="comment">// console terminal to 115200 baud</span></div>
dan_ackme 34:2616445d0823 156 <div class="line"></div>
dan_ackme 34:2616445d0823 157 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 158 <div class="line"> <span class="comment">// STEP 1: Instantiate WiConnect Library</span></div>
dan_ackme 34:2616445d0823 159 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 160 <div class="line"></div>
dan_ackme 34:2616445d0823 161 <div class="line"> <span class="comment">// Setup wiconnect serial interface configuration</span></div>
dan_ackme 34:2616445d0823 162 <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 34:2616445d0823 163 <div class="line"> <span class="comment">// The serial RX buffer will be dynamically allocated</span></div>
dan_ackme 34:2616445d0823 164 <div class="line"> SerialConfig serialConfig(WICONNECT_RX_PIN, WICONNECT_TX_PIN, 256, NULL);</div>
dan_ackme 34:2616445d0823 165 <div class="line"></div>
dan_ackme 34:2616445d0823 166 <div class="line"> <span class="comment">// Instantiate and initialize the Wiconnect library</span></div>
dan_ackme 34:2616445d0823 167 <div class="line"> <span class="comment">// Here we only specify the buffer size and not buffer pointer, this means</span></div>
dan_ackme 34:2616445d0823 168 <div class="line"> <span class="comment">// The internal buffer will be dynamically allocated</span></div>
dan_ackme 34:2616445d0823 169 <div class="line"> Wiconnect wiconnect(serialConfig, 256, NULL, WICONNECT_RESET_PIN);</div>
dan_ackme 34:2616445d0823 170 <div class="line"></div>
dan_ackme 34:2616445d0823 171 <div class="line"> <span class="comment">// set the default timeout to 15s as some websites take awhile to respond</span></div>
dan_ackme 34:2616445d0823 172 <div class="line"> wiconnect.setCommandDefaultTimeout(15000);</div>
dan_ackme 34:2616445d0823 173 <div class="line"></div>
dan_ackme 34:2616445d0823 174 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 175 <div class="line"> <span class="comment">// STEP 2: Initiate Communication with WiFi Module</span></div>
dan_ackme 34:2616445d0823 176 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 177 <div class="line"></div>
dan_ackme 34:2616445d0823 178 <div class="line"> printf(<span class="stringliteral">&quot;Initializing WiConnect Library...\r\n&quot;</span>);</div>
dan_ackme 34:2616445d0823 179 <div class="line"></div>
dan_ackme 34:2616445d0823 180 <div class="line"> <span class="comment">// Initialize communication with WiFi module</span></div>
dan_ackme 34:2616445d0823 181 <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 34:2616445d0823 182 <div class="line"> {</div>
dan_ackme 34:2616445d0823 183 <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>
dan_ackme 34:2616445d0823 184 <div class="line"> {</div>
dan_ackme 34:2616445d0823 185 <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>
dan_ackme 34:2616445d0823 186 <div class="line"> printf(<span class="stringliteral">&quot;https://developer.mbed.org/teams/ACKme/code/wiconnect-ota_example&quot;</span>);</div>
dan_ackme 34:2616445d0823 187 <div class="line"> }</div>
dan_ackme 34:2616445d0823 188 <div class="line"> <span class="keywordflow">else</span></div>
dan_ackme 34:2616445d0823 189 <div class="line"> {</div>
dan_ackme 34:2616445d0823 190 <div class="line"> printf(<span class="stringliteral">&quot;Failed to initialize communication with WiFi module!\r\n&quot;</span></div>
dan_ackme 34:2616445d0823 191 <div class="line"> <span class="stringliteral">&quot;Make sure the wires are connected correctly\r\n&quot;</span>);</div>
dan_ackme 34:2616445d0823 192 <div class="line"> }</div>
dan_ackme 34:2616445d0823 193 <div class="line"> <span class="keywordflow">for</span>(;;); <span class="comment">// infinite loop</span></div>
dan_ackme 34:2616445d0823 194 <div class="line"> }</div>
dan_ackme 34:2616445d0823 195 <div class="line"></div>
dan_ackme 34:2616445d0823 196 <div class="line"></div>
dan_ackme 34:2616445d0823 197 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 198 <div class="line"> <span class="comment">// STEP 3: Issue a HTTP GET request</span></div>
dan_ackme 34:2616445d0823 199 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 200 <div class="line"></div>
dan_ackme 34:2616445d0823 201 <div class="line"> <span class="comment">// Initiate a socket with an RX buffer of 256 bytes</span></div>
dan_ackme 34:2616445d0823 202 <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 34:2616445d0823 203 <div class="line"> WiconnectSocket socket(256);</div>
dan_ackme 34:2616445d0823 204 <div class="line"></div>
dan_ackme 34:2616445d0823 205 <div class="line"></div>
dan_ackme 34:2616445d0823 206 <div class="line"> printf(<span class="stringliteral">&quot;Issuing HTTP Request: %s\r\n&quot;</span>, HTTP_URL);</div>
dan_ackme 34:2616445d0823 207 <div class="line"></div>
dan_ackme 34:2616445d0823 208 <div class="line"> <span class="comment">// Issue HTTP request</span></div>
dan_ackme 34:2616445d0823 209 <div class="line"> <span class="comment">// NOTE: the module must have valid network credentials</span></div>
dan_ackme 34:2616445d0823 210 <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 34:2616445d0823 211 <div class="line"> {</div>
dan_ackme 34:2616445d0823 212 <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 34:2616445d0823 213 <div class="line"> <span class="keywordflow">for</span>(;;); <span class="comment">// infinite loop</span></div>
dan_ackme 34:2616445d0823 214 <div class="line"> }</div>
dan_ackme 34:2616445d0823 215 <div class="line"></div>
dan_ackme 34:2616445d0823 216 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 217 <div class="line"> <span class="comment">// STEP 4: Read the HTTP page and print</span></div>
dan_ackme 34:2616445d0823 218 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 219 <div class="line"></div>
dan_ackme 34:2616445d0823 220 <div class="line"> uint8_t *dataPtr;</div>
dan_ackme 34:2616445d0823 221 <div class="line"> uint16_t dataLength;</div>
dan_ackme 34:2616445d0823 222 <div class="line"></div>
dan_ackme 34:2616445d0823 223 <div class="line"> <span class="comment">// while there&#39;s data to read, retreive and print it</span></div>
dan_ackme 34:2616445d0823 224 <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 34:2616445d0823 225 <div class="line"> {</div>
dan_ackme 34:2616445d0823 226 <div class="line"> fwrite(dataPtr, 1, dataLength, stdout);</div>
dan_ackme 34:2616445d0823 227 <div class="line"> }</div>
dan_ackme 34:2616445d0823 228 <div class="line"></div>
dan_ackme 34:2616445d0823 229 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 230 <div class="line"> <span class="comment">// STEP 5: Done!</span></div>
dan_ackme 34:2616445d0823 231 <div class="line"> <span class="comment">//-------------------------------------------------------------------------</span></div>
dan_ackme 34:2616445d0823 232 <div class="line"></div>
dan_ackme 34:2616445d0823 233 <div class="line"> printf(<span class="stringliteral">&quot;HTTP GET example has completed!\r\n&quot;</span>);</div>
dan_ackme 34:2616445d0823 234 <div class="line"></div>
dan_ackme 34:2616445d0823 235 <div class="line"> <span class="keywordflow">while</span>(<span class="keyword">true</span>){} <span class="comment">// infinite loop</span></div>
dan_ackme 34:2616445d0823 236 <div class="line">}</div>
dan_ackme 34:2616445d0823 237 <div class="line"></div>
dan_ackme 34:2616445d0823 238 <div class="line"></div>
dan_ackme 34:2616445d0823 239 </div><!-- fragment --> </div><!-- contents -->
dan_ackme 34:2616445d0823 240 </div><!-- doc-content -->
dan_ackme 34:2616445d0823 241 <div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
dan_ackme 34:2616445d0823 242 <ul>
dan_ackme 34:2616445d0823 243 <li class="footer">&copy; ACKme Networks 2014</li>
dan_ackme 34:2616445d0823 244 </ul>
dan_ackme 34:2616445d0823 245 </div>
dan_ackme 34:2616445d0823 246 </body>
dan_ackme 34:2616445d0823 247 </html>