Rob Dobson / RdWebServer

A simple web server mainly based on ideas from Jasper Schuurmans Netduino web server

Dependents:   RdBlindsServer SpideyWallWeb RdGasUseMonitor

A fast and reliable web server for MBED! http://robdobson.com/2015/08/a-reliable-mbed-webserver/

It has a very neat way to implement REST commands and can serve files from local storage (on LPC1768 for instance) and from SD cards. It also has a caching facility which is particularly useful for serving files from local storage.

The server can be run in the main() thread (and has a sub-2ms response time if this is done) or in a mbed-rtos thread which increases the response time to (a still respectable) 30ms or so.

The latest project that uses this is here - https://developer.mbed.org/users/Bobty/code/SpideyWallWeb/

int main (void)
{
    // Ethernet interface
    EthernetInterface::init();

    // Connect ethernet
    EthernetInterface::connect();

    // Init the web server
    pc.printf("Starting web server\r\n");
    char* baseWebFolder = "/sd/";  // should be /sd/ for SDcard files - not used for local file system
    RdWebServer webServer;
    
    // Add commands to handle the home page and favicon
    webServer.addCommand("", RdWebServerCmdDef::CMD_LOCALFILE, NULL, "index.htm", true);
    webServer.addCommand("favicon.ico", RdWebServerCmdDef::CMD_LOCALFILE, NULL, NULL, true);
    
    // Add the lightwall control commands
    webServer.addCommand("name", RdWebServerCmdDef::CMD_CALLBACK, &lightwallGetSystemName);
    webServer.addCommand("clear", RdWebServerCmdDef::CMD_CALLBACK, &lightwallClear);
    webServer.addCommand("rawfill", RdWebServerCmdDef::CMD_CALLBACK, &lightwallRawFill);
    webServer.addCommand("fill", RdWebServerCmdDef::CMD_CALLBACK, &lightwallFill);
    webServer.addCommand("showleds", RdWebServerCmdDef::CMD_CALLBACK, &lightwallShowLeds);
    
    // Start the server
    webServer.init(WEBPORT, &led4, baseWebFolder);
    webServer.run();

}

// Get system name - No arguments required
char* lightwallGetSystemName(int method, char*cmdStr, char* argStr, char* msgBuffer, int msgLen, 
                int contentLen, unsigned char* pPayload, int payloadLen, int splitPayloadPos)
{
    // Perform any required actions here ....

    // ...

    // Return the system name
    return systemName;
}

This server was originally based on a Netduino web server from Jasper Schuurmans but has been optimised for speed.

Diff: RdWebServer.cpp

Revision:
16:0248bbfdb6c1
Parent:
15:0865fa4b046a
Child:
17:080f2bed8b36
--- a/RdWebServer.cpp	Tue May 05 20:27:33 2015 +0000
+++ b/RdWebServer.cpp	Tue May 05 22:14:16 2015 +0000
@@ -56,12 +56,23 @@
     if (!_initOk)
         return;
     
+    // The sample web server on MBED site turns off blocking after the accept has happened
+    // I've tried this but it doesn't seem to yield a reliable server
     bool blockingOnAccept = true;
     bool blockingOnReceive = true;
-    int timeoutOnBlocking = 2000;
+    
+    // This is the same as the default in the socket.cpp file
+    int timeoutOnBlocking = 1500;
+    
+    // Currently tested using close connection after send with a single file which works fine
+    // If closeConnAfterSend is set false then the socket connection remains open and only
+    // one client can access the server at a time
+    // Need to test with the closeConnAfterSend seetting true when trying to download multiple files
+    // for a website as previous experience would indicate that requests might be missed in this scenario
+    // although all other settings may not have been the same
+    bool closeConnAfterSend = true;
+    bool closeConnOnReceiveFail = true;
     const char* closeConnStr = "Connection: Close\r\n";
-    bool closeConnAfterSend = false;
-    bool closeConnOnReceiveFail = true;
     
     // Start accepting connections
     while (true)
@@ -101,7 +112,7 @@
             }
             if (rxLen == 0)
             {
-                RD_DBG("clientSocketConn.receive() returned %d - ignoring\r\n", rxLen);
+                RD_DBG("clientSocketConn.receive() returned %d - ignoring -  is connected %d\r\n", rxLen, clientSocketConn.is_connected());
                 continue;
             }
             if (rxLen > HTTPD_MAX_REQ_LENGTH)
@@ -126,7 +137,8 @@
             if (closeConnAfterSend)
             {
                 int closeRet = clientSocketConn.close();
-                RD_DBG("After send connection close() ret %d\r\n", closeRet);
+                RD_DBG("After send connection close() ret %d is connected %d\r\n", closeRet, clientSocketConn.is_connected());
+                forcedClosed = true;
             }
         }
     }