Here is where I stand so far with my arduino development.
I am trying to get an arduino to read and parse html POST data.
I can get the arduino to see the data (it is packed as an extra line at the end of the header).
I just need to write something to convert an example into meaningful values.
To read the POST information:
void loop() {
// listen for incoming clients
EthernetClient client = server.available();
if (client) {
Serial.println("new client");
// an http request ends with a blank line
boolean currentLineIsBlank = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
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' && currentLineIsBlank) {
// it is after the double cr-lf that the variables are
// read another line!
String POST = "";
while(client.available())
{
c = client.read();
// save the variables somewhere
POST += c;
}
Serial.println(POST);
// Split POST
if(POST != "")
{
// C0=471&C1=431&C2=388&C3=350&C4=387&C5=321
}
// send a standard http response header
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connnection: close");
client.println();
client.println("<!DOCTYPE HTML>");
client.println("<html>");
// add a meta refresh tag, so the browser pulls again every 5 seconds:
//client.println("<meta http-equiv=\"refresh\" content=\"5\">");
// output the value of each analog input pin
client.print("<form method='post'>");
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
client.print("analog input ");
client.print(analogChannel);
client.print(" is ");
client.print(sensorReading);
String str;
str = String("<input type='text' value = '");
str = str + sensorReading + String("' name='C") + analogChannel + String("'>");
client.print(str);
client.println("<br />");
}
client.print("<input type='submit'></form>");
client.println("</html>");
break;
}
if (c == '\n') {
// 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 disonnected");
}
}
A standard POST line looks like
C0=471&C1=431&C2=388&C3=350&C4=387&C5=321
Separation is using the & character
Now I just need to split the POST line so it can be worked on.
Something will come to me no doubt. It is not difficult.
I think I will take each name=value and send it to a function to work on each one at a time.
