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Dependencies:   BMP280

WebUI.cpp

Committer:
mwthewsey
Date:
2018-01-06
Revision:
9:ac5673cca703
Parent:
2:5a38ae8459d5
Child:
13:41c394fa932c

File content as of revision 9:ac5673cca703:

#if !FEATURE_LWIP
    #error [NOT_SUPPORTED] LWIP not supported for this target
#endif
//We need to look into what if statements like the one above do.
#include "WebUI.h"
#include "mbed.h"
#include "EthernetInterface.h"
#include "TCPServer.h"
#include "TCPSocket.h"
#include <iostream>
#include <string> 

//Now setup a web server
TCPServer srv;           //TCP/IP Server
TCPSocket clt_sock;      //Socket for communication
SocketAddress clt_addr;  //Address of incoming connection

#define HTTP_STATUS_LINE "HTTP/1.0 200 OK"
#define HTTP_HEADER_FIELDS "Content-Type: text/html; charset=utf-8"
#define HTTP_MESSAGE_BODY1 ""                                    \
"<html>" "\r\n"                                                  \
"  <body style=\"display:flex;text-align:center\">" "\r\n"       \
"    <div style=\"margin:auto\">" "\r\n"                         \
"      <h1>Hello World</h1>" "\r\n"                              \
"      <p>The LDR value is "                                     

#define HTTP_MESSAGE_BODY2 ""                                    \
       "</p>" "\r\n"                                             \
"    </div>" "\r\n"                                              \
"  </body>" "\r\n"                                               \
"</html>"

#define HTTP_RESPONSE HTTP_STATUS_LINE "\r\n"   \
                      HTTP_HEADER_FIELDS "\r\n" \
                      "\r\n"                    \
                      HTTP_MESSAGE_BODY "\r\n"

#define IP        "10.0.0.10"
#define NETMASK   "255.0.0.0"
#define GATEWAY   "10.0.0.1"

void WebUISetup(void){
    printf("Basic HTTP server example\n");
    
    //Configure an ethernet connection
    EthernetInterface eth;
    eth.set_network(IP, NETMASK, GATEWAY);
    eth.connect();
    printf("The target IP address is '%s'\n", eth.get_ip_address());
    
    
    
    /* Open the server on ethernet stack */
    srv.open(&eth);
    
    /* Bind the HTTP port (TCP 80) to the server */
    srv.bind(eth.get_ip_address(), 80);
    
    /* Can handle 5 simultaneous connections */
    srv.listen(5);
}

void WebUIUpdate(float ldr){
    while (true) {
        using namespace std;
        //Block and wait on an incoming connection
        srv.accept(&clt_sock, &clt_addr);
        printf("accept %s:%d\n", clt_addr.get_ip_address(), clt_addr.get_port());
        
        //Uses a C++ string to make it easier to concatinate
        string response;
        //This is a C string
        char ldr_str[64];
        
        //Read the LDR value
        float u = ldr;
        
        //Convert to a C String
        sprintf(ldr_str, "%5.3f", u );
        printf("LDR: %5.3f\n\r", u);
        
        //Build the C++ string response
        response = HTTP_MESSAGE_BODY1;
        response += ldr_str;
        response += HTTP_MESSAGE_BODY2;
        
        //Send static HTML response (as a C string)
        clt_sock.send(response.c_str(), response.size()+6);    
    }
}