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/tcp_server_2example_8cpp-example.html

Committer:
dan_ackme
Date:
2014-10-23
Revision:
26:8067e3d463d3
Parent:
21:17bb3eddcbae

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        WiConnect Host Library- API Reference Guide</td>
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<div class="title">tcp_server/example.cpp</div>  </div>
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<div class="contents">
<p>This is an example of using the TCP server API to send/receive data from a remote TCP client.</p>
<p>This example is intended to be used with '<a class="el" href="tcp__client_8py_source.html">tcp_client.py</a>' python script in the same directory as this example.cpp file.</p>
<p>It works as follows:</p><ol type="1">
<li>Instantiate the WiConnect Library</li>
<li>Initiate Communication with WiFi Module</li>
<li>Join the network</li>
<li>Start the TCP server</li>
<li>Wait for clients to connect</li>
<li>Receive data from client</li>
<li>Send data to client</li>
<li>Close client connection</li>
<li>Goto sleep 5</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 port the server listens on</span></div>
<div class="line"><span class="preprocessor">#define TCP_SERVER_PORT 7</span></div>
<div class="line"><span class="comment">// The maximum simultaneous client connections</span></div>
<div class="line"><span class="comment">// (note this example only supports 1)</span></div>
<div class="line"><span class="preprocessor">#define TCP_SERVER_MAX_CLIENTS 1</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// This is the name of your WiFi network</span></div>
<div class="line"><span class="comment">// Look for this name in your WiFi settings</span></div>
<div class="line"><span class="comment">// (e.g. your phone&#39;s list of WiFi networks in the WiFi settings menu)</span></div>
<div class="line"><span class="comment">// tip: add double-quotes around SSID to add spaces to name</span></div>
<div class="line"><span class="preprocessor">#define NETWORK_SSID &quot;\&quot;&lt;YOUR NETWORK NAME HERE&gt;\&quot;&quot;</span></div>
<div class="line"></div>
<div class="line"><span class="comment">// This is the password of your WiFi network</span></div>
<div class="line"><span class="comment">// Leave as empty string (e.g &quot;&quot;) to connect to OPEN network</span></div>
<div class="line"><span class="preprocessor">#define NETWORK_PASSWORD &quot;\&quot;&lt;YOUR NETWORK PASSWORD HERE&gt;\&quot;&quot;</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"> * 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"><span class="comment">/******************************************************************************</span></div>
<div class="line"><span class="comment"> * Local Functions</span></div>
<div class="line"><span class="comment"> */</span></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"><span class="comment">// Transmit/receive buffers for the remote client socket</span></div>
<div class="line"><span class="keyword">static</span> uint8_t clientRxBuffer[256], clientTxBuffer[256];</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">// STEP 1: Instantiate WiConnect Library</span></div>
<div class="line"><span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></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 the Wiconnect library</span></div>
<div class="line"><span class="comment">// Here we specify the buffer size ONLY which means we&#39;re using dynmaic allocation</span></div>
<div class="line">Wiconnect wiconnectIfc(serialConfig, 256, NULL, WICONNECT_RESET_PIN);</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"> * 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">    <a name="a0"></a><a class="code" href="group__api__core__types.html#ga325637ed501728bd6c8c7a7982b9ce05">WiconnectResult</a> result;</div>
<div class="line">    <span class="comment">// Instantiate a client socket object with statically allocaed transmit/receive buffers</span></div>
<div class="line">    <span class="comment">// Note: this socket object isn&#39;t valid until tcpAccept() is called with in</span></div>
<div class="line">    WiconnectSocket clientSocket(<span class="keyword">sizeof</span>(clientRxBuffer), clientRxBuffer, <span class="keyword">sizeof</span>(clientTxBuffer), clientTxBuffer);</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"></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>(<a name="a1"></a><a class="code" href="group__api__core__macro.html#gab27aa3ef76302b5221766abfd4f47e64">WICONNECT_FAILED</a>(result, wiconnectIfc.init(<span class="keyword">true</span>)))</div>
<div class="line">    {</div>
<div class="line">        printf(<span class="stringliteral">&quot;Failed to initialize communication with WiFi module: %s\r\n&quot;</span></div>
<div class="line">                <span class="stringliteral">&quot;Make sure the wires are connected correctly\r\n&quot;</span>, Wiconnect::getWiconnectResultStr(result));</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 3: Join the network</span></div>
<div class="line">    <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line">    printf(<span class="stringliteral">&quot;Joining WiFi network: %s\r\n&quot;</span>, NETWORK_SSID);</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>(<a class="code" href="group__api__core__macro.html#gab27aa3ef76302b5221766abfd4f47e64">WICONNECT_FAILED</a>(result, wiconnectIfc.join(NETWORK_SSID, NETWORK_PASSWORD)))</div>
<div class="line">    {</div>
<div class="line">        printf(<span class="stringliteral">&quot;Failed to join network: %s\r\n&quot;</span>, Wiconnect::getWiconnectResultStr(result));</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 4: Start the TCP server</span></div>
<div class="line">    <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line">    printf(<span class="stringliteral">&quot;Starting TCP server, listening on: %s:%d\r\n&quot;</span>, wiconnectIfc.getIpAddress(), TCP_SERVER_PORT);</div>
<div class="line"></div>
<div class="line">    <span class="keywordflow">if</span>(<a class="code" href="group__api__core__macro.html#gab27aa3ef76302b5221766abfd4f47e64">WICONNECT_FAILED</a>(result, wiconnectIfc.tcpListen(TCP_SERVER_PORT, TCP_SERVER_MAX_CLIENTS)))</div>
<div class="line">    {</div>
<div class="line">        printf(<span class="stringliteral">&quot;Failed to start TCP server: %s\r\n&quot;</span>, Wiconnect::getWiconnectResultStr(result));</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="keywordflow">for</span>(;;)</div>
<div class="line">    {</div>
<div class="line">        <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line">        <span class="comment">// STEP 5: Wait for clients to connect</span></div>
<div class="line">        <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line">        printf(<span class="stringliteral">&quot;Waiting for a client to connect...\r\n&quot;</span>);</div>
<div class="line"></div>
<div class="line">        <span class="keywordflow">if</span>(<a class="code" href="group__api__core__macro.html#gab27aa3ef76302b5221766abfd4f47e64">WICONNECT_FAILED</a>(result, wiconnectIfc.tcpAccept(clientSocket)))</div>
<div class="line">        {</div>
<div class="line">            printf(<span class="stringliteral">&quot;Failed to accept client: %s\r\n&quot;</span>, Wiconnect::getWiconnectResultStr(result));</div>
<div class="line">            <span class="keywordflow">continue</span>;</div>
<div class="line">        }</div>
<div class="line">        printf(<span class="stringliteral">&quot;Client connected: %s:%d\r\n&quot;</span>, clientSocket.getHost(), clientSocket.getRemotePort());</div>
<div class="line"></div>
<div class="line">        <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line">        <span class="comment">// STEP 6: Receive data from client</span></div>
<div class="line">        <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line">        uint8_t *dataPtr;   <span class="comment">// pointer to client socket&#39;s internal RX buffer</span></div>
<div class="line">        uint16_t readSize;  <span class="comment">// will contain number of bytes available in RX buffer</span></div>
<div class="line">        <span class="keywordflow">if</span>(<a class="code" href="group__api__core__macro.html#gab27aa3ef76302b5221766abfd4f47e64">WICONNECT_FAILED</a>(result, clientSocket.read(&amp;dataPtr, &amp;readSize)))</div>
<div class="line">        {</div>
<div class="line">            printf(<span class="stringliteral">&quot;Failed to read data from client: %s\r\n&quot;</span>, Wiconnect::getWiconnectResultStr(result));</div>
<div class="line">            clientSocket.close();</div>
<div class="line">            <span class="keywordflow">continue</span>;</div>
<div class="line">        }</div>
<div class="line"></div>
<div class="line">        printf(<span class="stringliteral">&quot;From client: %s\r\n&quot;</span>, dataPtr);</div>
<div class="line"></div>
<div class="line"></div>
<div class="line">        <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line">        <span class="comment">// STEP 7: Send data to client</span></div>
<div class="line">        <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line">        <span class="keywordflow">if</span>(<a class="code" href="group__api__core__macro.html#gab27aa3ef76302b5221766abfd4f47e64">WICONNECT_FAILED</a>(result, clientSocket.puts(<span class="stringliteral">&quot;Hello client!!\r\n&quot;</span>)))</div>
<div class="line">        {</div>
<div class="line">            printf(<span class="stringliteral">&quot;Failed to send data to client: %s\r\n&quot;</span>, Wiconnect::getWiconnectResultStr(result));</div>
<div class="line">            clientSocket.close();</div>
<div class="line">            <span class="keywordflow">continue</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 8: Close client connection</span></div>
<div class="line">        <span class="comment">//-------------------------------------------------------------------------</span></div>
<div class="line"></div>
<div class="line">        clientSocket.close();</div>
<div class="line">    }</div>
<div class="line"></div>
<div class="line">}</div>
<div class="line"></div>
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