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.

Files at this revision

API Documentation at this revision

Revision 16:0248bbfdb6c1, committed 2015-05-05

Comitter:
Bobty
Date:
Tue May 05 22:14:16 2015 +0000
Parent:
15:0865fa4b046a
Child:
17:080f2bed8b36
Commit message:
Working on FRDM K64F with two clients ok - browser tends to reopen socket so curl has to wait for timeout but seems to retry ok

Changed in this revision

RdWebServer.cpp Show annotated file Show diff for this revision Revisions of this file 
--- 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;
             }
         }
     }