teensyServerWorkInProgress

/*
pots on 8,9 analog channels change background colour and fill color of svg
*/

#include <SPI.h>
#include <NativeEthernet.h>
byte mac[] = {
  0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED
};
IPAddress ip(10, 1, 0, 177);
EthernetServer server(80);
void initClient(EthernetClient client);


void setup() {
delay(5000);  //you want this delay. reason: tl;dr
  Serial.begin(9600);
  Ethernet.begin(mac, ip);

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());
}


void loop() {
  // listen for incoming clients
  EthernetClient client = server.available();
  if (client) {
    boolean currentLineIsBlank = true;
    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
 //        Serial.write(c);
           /*
client disconnected
GET / HTTP/1.1
Host: 10.1.0.177
User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:94.0) Gecko/20100101 Firefox/94.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*\/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Upgrade-Insecure-Requests: 1
Cache-Control: max-age=0
client disconnected

        */

       if (c == '\n' && currentLineIsBlank) {
       initClient(client);
            int sensorReading0 = analogRead(8);
            int sensorReading1 = analogRead(9);
client.print("<svg version=\"1.1\" \n baseProfile=\"full\"\n width=\"300\" height=\"200\"\n  xmlns=\"http://www.w3.org/2000/svg\">\n <rect width=\"100%\" height=\"100%\" fill=\"#");
client.print(sensorReading0);
client.print("\" /> <circle cx=\"150\" cy=\"100\" r=\"90\" fill=\"#");
client.print(sensorReading1);
client.print("\" />\n</svg>");
          client.println("<br />");
          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 disconnected");
  }
}

void initClient(EthernetClient client){
     // send a standard http response header
          client.println("HTTP/1.1 200 OK");
          client.println("Content-Type: text/html");
          client.println("Connection: close");  // the connection will be closed after completion of the response
          client.println("Refresh: 5");  // refresh the page automatically every 5 sec
          client.println();
          client.println("<!DOCTYPE HTML>");
          client.println("<html>");
  }