how do i send timestamp from RTC to website in a Get request? using arduino

问题

Hi i have been trying to send data from my arduino to my ASP.Net website and have been successful until i try to send a timestamp as a variable in the GET request. I have think it has somthing to do with the forward slash that separates the values but when i send a diffrent symbol like a "-" i get the same result (no data saved)

EDIT: sorry its not the forward slash! it is because asp.net expects: 01/01/01 01:01:01 and am sending 1/1/1 1:1:1. so i need to figure out how send it with the zero in front if needed

my code so far (the sending part)

void sendLightData() {
  DateTime now = rtc.now();
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // no point in carrying on, so do nothing forevermore:
    // try to congifure using IP address instead of DHCP:
    Ethernet.begin(mac, ip);
  }
  // give the Ethernet shield a second to initialize:
  delay(1000);
  Serial.println("connecting...");

  // if you get a connection, report back via serial:
  if (client.connect(server, 80)) {
    Serial.println("connected");
    // Make a HTTP request:
    client.print("GET /LightData.aspx?uname=");
    client.print(userName);
    client.print("&pword=");
    client.print(password);
    client.print("&LStatus=");
    client.print(lightStatus);
    client.print("&LHeight=9&");
    client.print("timestamp=");
    client.print(now.day(), DEC);
    client.print("/");
    client.print(now.month(), DEC);
    client.print("/");
    client.print(now.year(), DEC);
    client.print("%20");
    client.print(now.hour(), DEC);
    client.print(":");
    client.print(now.minute(), DEC);
    client.print(":");
    client.print(now.second(), DEC); 
    client.println(" HTTP/1.1");
    client.println("Host: www.auntieagie.eu");
    client.println("Connection: close");
    client.println();
    // this works if entered into a browser (trying to replicate in arduino) http://auntieagie.eu/LightData.aspx?uname=test&pword=t&LStatus=1&LHeight=2&timestamp=21/02/2014%2001:01:01
  }

any help or a point in the right direction would be great

回答1:

you need to url encode things like /

%2F

so 27/2/2014 would be 27%2F2%2F2014

回答2:

Just URL encode the whole date:

...
client.print("timestamp=");
client.print(URLEncode(String(now)));
...

Helper method:

/**
 * URL Encode a string.
 * 
 * Based on http://www.icosaedro.it/apache/urlencode.c
 *
 */
String URLEncode(const char* msg)
{
    const char *hex = "0123456789abcdef";
    String encodedMsg = "";

    while (*msg!='\0'){
        if( ('a' <= *msg && *msg <= 'z')
                || ('A' <= *msg && *msg <= 'Z')
                || ('0' <= *msg && *msg <= '9') ) {
            encodedMsg += *msg;
        } else {
            encodedMsg += '%';
            encodedMsg += hex[*msg >> 4];
            encodedMsg += hex[*msg & 15];
        }
        msg++;
    }
    return encodedMsg;
}

来源：https://stackoverflow.com/questions/22053197/how-do-i-send-timestamp-from-rtc-to-website-in-a-get-request-using-arduino

标签

ASP.NET

timestamp

arduino