아두이노 이더넷 웹서버 만들기 -#12

이전 코드에 비해 크게 변경된것은 없으니 비교해서 보면 쉽게 이해가 될듯 하다.
중요한것은 파싱 함수를 하나 추가 한것이다.
일반 서버급의 속도로 바로 바로 링크페이지가 전환 되지 않는다는점도 이해가 필요하다.
물론 더 반응속도를 올리는것은 가능해 보인다.

 

추가로 이야기 한다면 아파치 웹서버나 기타 웹서버들이 기본적으로 어떻게 반응하는지에 대한 이해를 했으면 하다.
따라져보면 더 엄청난 기능을 하지만, 기본적인 이해는 이것으로도 충분하다.

 

 

 

 

/*Web Server*/
#include <SPI.h>
#include <Ethernet.h>
#include <string.h>
 
// Enter a MAC address and IP address for your controller below.
byte mac[] = {0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED};
IPAddress ip(192, 168, 5, 177);
 
// Initialize the Ethernet server library
// with the IP address and port you want to use
// (port 80 is default for HTTP):
EthernetServer server(80);
char msg[500];
char* m;
int select= 0;
void setup() 
{
  Serial.begin(115200);
  while (!Serial) 
  {
    ; // wait for serial port to connect. Needed for native USB port only
  }
  Serial.println("Ethernet WebServer Example");
 
  // start the Ethernet connection and the server:
  Ethernet.begin(mac, ip);
 
  // Check for Ethernet hardware present
  if (Ethernet.hardwareStatus() == EthernetNoHardware) 
  {
    Serial.println("Ethernet shield was not found.  Sorry, can't run without hardware. :(");
    while (true) 
    {
      delay(1); // do nothing, no point running without Ethernet hardware
    }
  }
  if (Ethernet.linkStatus() == LinkOFF) 
  {
    Serial.println("Ethernet cable is not connected.");
  }
 
  // start the server
  server.begin();
  Serial.print("server is at ");
  Serial.println(Ethernet.localIP());
  select= 0;
  m =msg;
}
 
 
void loop() 
{
  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) 
  {
    Serial.println("new client");
    // an http request ends with a blank line
    bool currentLineIsBlank = true;
    while (client.connected()) 
    {
      if (client.available()) 
      {
        char c;
        *(m) = c = client.read();
        m++;
        //Serial.write(c);
        // if you've gotten to the end of the line (received a newline
        // character) and the line is blank, the http request has ended,
        // so you can send a reply
        if (c == '\n')
        {
            *m='\0';
            Serial.write(msg);
            if(select ==0) select = msg_parsing(msg);
            m = msg;          
            if(currentLineIsBlank) 
            {
              Serial.println(select);
              if (select == 1) webPage1(client);
              else webPage2(client);
              select =0;
              break;
            }
            else
            {
              // you're starting a new line
              currentLineIsBlank = true; 
            }      
        } 
        else if (c != '\r') 
        {
          // you've gotten a character on the current line
          currentLineIsBlank = false;
        }
      }
    }
    // give the web browser time to receive the data
    delay(1);
    // close the connection:
    client.stop();
    Serial.println("client disconnected");
  }
}
 
int msg_parsing(char* str)
{
  int nothing = 0;
  char*p =str;
  if( str==NULL || strlen(str)==0) return nothing;
  while(*str!='\r' && *str!='\n' && *str!='\0' )
  {
    if(*str==':') 
    {
      *str='\0';
      if(strcmp(p, "Referer")==0)
      {
        str++;
        if (strstr(str,"page1.html")) return 1;
        else if (strstr(str,"page2.html")) return 2;
      }
      break;
    }
    else str++;
  }
  return nothing;
}
 
void read_Temp1(char*& p)
{
    for(int i = 0; i < 5; i++)
    {
        double t;
        t  = analogRead (A0+i); // A0의 값을 불러옵니다.
        t *= 5.0 / 10.24; //온도값을 계산하는 공식입니다.
        p += sprintf(p, "T(A%1d)=%s C<br/>\n", i, String(t,1).c_str());             
    }
    return  ;
}
void read_Temp2(char*& p)
{
    double avg = 0;
    for(int i = 0; i < 5; i++)
    {
        double t;
        t  = analogRead (A0+i); // A0의 값을 불러옵니다.
        t *= 5.0 / 10.24; //온도값을 계산하는 공식입니다.  
        avg += t;       
    }
    p += sprintf(p, "T(avg)=%s C<br/>\n", String(avg/5.0,1).c_str());      
    return  ;
}
 
void webPage1(EthernetClient& c)
{
    // send a standard http response header
    char*p=msg;
    p+=sprintf(p,"HTTP/1.1 200 OK\n");
    p+=sprintf(p,"Content-Type: text/html\n");
    p+=sprintf(p,"Connection: close\n"); 
    p+=sprintf(p,"Refresh: 5\n\n");  // refresh the page automatically every xx sec
    p+=sprintf(p,"<!DOCTYPE HTML>\n");
    p+=sprintf(p,"<html>\n");
    read_Temp1(p);
    p+=sprintf(p,"<A href=\"http://192.168.5.177/page1.html\">Page1</A><BR>\n");  
    p+=sprintf(p,"<A href=\"http://192.168.5.177/page2.html\">Page2</A><BR>\n");       
    p+=sprintf(p,"</html>\n");
    Serial.println(strlen(msg));
    c.println(msg);
    return ;
}
 
void webPage2(EthernetClient& c)
{
    // send a standard http response header
    char*p=msg;
    p+=sprintf(p,"HTTP/1.1 200 OK\n");
    p+=sprintf(p,"Content-Type: text/html\n");
    p+=sprintf(p,"Connection: close\n"); 
    p+=sprintf(p,"Refresh: 5\n\n");  // refresh the page automatically every xx sec
    p+=sprintf(p,"<!DOCTYPE HTML>\n");
    p+=sprintf(p,"<html>\n");
    read_Temp2(p);
    p+=sprintf(p,"<A href=\"http://192.168.5.177/page1.html\">Page1</A><BR>\n");  
    p+=sprintf(p,"<A href=\"http://192.168.5.177/page2.html\">Page2</A><BR>\n");        
    p+=sprintf(p,"</html>\n");
    Serial.println(strlen(msg));
    c.println(msg);
    return ;
}