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design/index.html

@@ -137,7 +137,7 @@
 </ul>
 <h2 id="limitations">Limitations</h2>
 <ul>
-<li>On Windows and Android certificate validation needs to be setup so that SocketTLSOptions.caFile point to a pem file, such as the one distributed by Firefox. Unless that setup is done connecting to a wss endpoint will display an error. On Windows with mbedtls the message will contain <code>error in handshake : X509 - Certificate verification failed, e.g. CRL, CA or signature check failed</code>.</li>
+<li>On Android, or when using MbedTLS certificate validation needs to be setup so that SocketTLSOptions.caFile point to a pem file, such as the one distributed by <a href="https://curl.haxx.se/docs/caextract.html">Firefox</a>. Unless that setup is done connecting to a wss endpoint will display an error. On Windows with mbedtls the message will contain <code>error in handshake : X509 - Certificate verification failed, e.g. CRL, CA or signature check failed</code>.</li>
 <li>There is no convenient way to embed a ca cert.</li>
 <li>Automatic reconnection works at the TCP socket level, and will detect remote end disconnects. However, if the device/computer network become unreachable (by turning off wifi), it is quite hard to reliably and timely detect it at the socket level using <code>recv</code> and <code>send</code> error codes. <a href="https://stackoverflow.com/questions/14782143/linux-socket-how-to-detect-disconnected-network-in-a-client-program">Here</a> is a good discussion on the subject. This behavior is consistent with other runtimes such as node.js. One way to detect a disconnected device with low level C code is to do a name resolution with DNS but this can be expensive. Mobile devices have good and reliable API to do that.</li>
 <li>The server code is using select to detect incoming data, and creates one OS thread per connection. This is not as scalable as strategies using epoll or kqueue.</li>

index.html

@@ -263,5 +263,5 @@ webSocket.send("hello world");
 
 <!--
 MkDocs version : 1.1
-Build Date UTC : 2020-04-05 00:54:48
+Build Date UTC : 2020-04-05 01:13:23
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search/search_index.json

@@ -1 +1 @@
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It has been tested on the following platforms. macOS iOS Linux Android Windows FreeBSD Example code // Required on Windows ix::initNetSystem(); // Our websocket object ix::WebSocket webSocket; std::string url(\"ws://localhost:8080/\"); webSocket.setUrl(url); // Setup a callback to be fired when a message or an event (open, close, error) is received webSocket.setOnMessageCallback([](const ix::WebSocketMessagePtr& msg) { if (msg->type == ix::WebSocketMessageType::Message) { std::cout << msg->str << std::endl; } } ); // Now that our callback is setup, we can start our background thread and receive messages webSocket.start(); // Send a message to the server (default to TEXT mode) webSocket.send(\"hello world\"); Why another library? There are 2 main reasons that explain why IXWebSocket got written. First, we needed a C++ cross-platform client library, which should have few dependencies. What looked like the most solid one, websocketpp did depend on boost and this was not an option for us. Secondly, there were other available libraries with fewer dependencies (C ones), but they required calling an explicit poll routine periodically to know if a client had received data from a server, which was not elegant. We started by solving those 2 problems, then we added server websocket code, then an HTTP client, and finally a very simple HTTP server. IXWebSocket comes with a command line utility named ws which is quite handy, and is now packaged with alpine linux. You can install it with apk add ws . Few dependencies (only zlib) Simple to use ; uses std::string and std::function callbacks. Complete support of the websocket protocol, and basic http support. Client and Server TLS support Alternative libraries There are plenty of great websocket libraries out there, which might work for you. Here are a couple of serious ones. websocketpp - C++ beast - C++ libwebsockets - C \u00b5WebSockets - C Contributing IXWebSocket is developed on GitHub . 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