Esp32/esp32 bme680 http

This needs cleanup. This also blinks the onboard neopixel of exp32 from green to red as it processes the request.

#include <Wire.h>
#include <SPI.h>
#include <Adafruit_NeoPixel.h>
#include <Adafruit_Sensor.h>
#include "Adafruit_BME680.h"

// https://www.arduino.cc/reference/en/libraries/wifi//
#include <WiFi.h>
// #include <Adafruit_NeoPixel.h>

// esp32 onboard Neopixel stuff
#define PIN        8
#define NUMPIXELS 1
#define DELAYVAL 500 
#define SEALEVELPRESSURE_HPA (1013.25)
#define I2C_SDA 0
#define I2C_SCL 1

const char* ssid = "Tomato24";
const char* password = "";

// Set web server port number to 80
WiFiServer server(80);

Adafruit_BME680 bme;

// Variable to store the HTTP request
String header;

Adafruit_NeoPixel pixels(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);

// Current time
unsigned long currentTime = millis();
// Previous time
unsigned long previousTime = 0; 
// Define timeout time in milliseconds (example: 2000ms = 2s)
const long timeoutTime = 2000;

void setup() {
  Serial.begin(115200);

  Serial.print("pixel being");
  pixels.begin();
  Serial.print("pixel done");
  
  Serial.println(F("BME680 begin"));
    Wire.begin(I2C_SDA, I2C_SCL);
  if (!bme.begin()) {
    Serial.println("Could not find a valid BME680 sensor, check wiring!");
    while (1);
  }

  // Set up oversampling and filter initialization
  bme.setTemperatureOversampling(BME680_OS_8X);
  bme.setHumidityOversampling(BME680_OS_2X);
  bme.setPressureOversampling(BME680_OS_4X);
  bme.setIIRFilterSize(BME680_FILTER_SIZE_3);
  bme.setGasHeater(320, 150); // 320*C for 150 ms
  
  // Connect to Wi-Fi network with SSID and password
  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();
}

void loop(){

  pixels.clear();

  WiFiClient client = server.available();   // Listen for incoming clients

  if (client) {                             // If a new client connects,

    currentTime = millis();
    previousTime = currentTime;
    pixels.setPixelColor(0, pixels.Color(255, 0, 0)); // red
    pixels.show();
    Serial.println("New Client.");          // print a message out in the serial port
    String currentLine = "";                // make a String to hold incoming data from the client
    while (client.connected() && currentTime - previousTime <= timeoutTime) {  // loop while the client's connected
      currentTime = millis();
      if (client.available()) {             // if there's bytes to read from the client,
        char c = client.read();             // read a byte, then
        Serial.write(c);                    // print it out the serial monitor
        header += c;
        if (c == '\n') {                    // if the byte is a newline character
          // if the current line is blank, you got two newline characters in a row.
          // that's the end of the client HTTP request, so send a response:
          if (currentLine.length() == 0) {
            // HTTP headers always start with a response code (e.g. HTTP/1.1 200 OK)
            // and a content-type so the client knows what's coming, then a blank line:
            client.println("HTTP/1.1 200 OK");
            client.println("Content-type:text/html");
            client.println("Connection: close");
            client.println();
            
            // turns the GPIOs on and off
            if (header.indexOf("GET /metrics") >= 0) {
              Serial.println("GET /metrics");
              Serial.print("bme.performReading()");
              if (! bme.performReading()) {
                Serial.println("Failed to perform reading.");
                client.println("Failed to perform reading.");
                return;
              }
              Serial.println("Reading done, sending....");
              // # HELP temperature Temperature in Celcius"
              // # TYPE temperature guage")
              String message = "temperature ";
              message += bme.temperature;
              message += " ";
              
              // Serial.println("# HELP barometric_pressure in hectopascals (hPa)"
              // Serial.println("# TYPE barometric_pressure guage")
              message += "barometric_pressure ";
              message += (bme.pressure / 100.0);
              message += " ";

              // Serial.println("# HELP humidity relative humidity percent (%)"
              // Serial.println("# TYPE humidity guage")
              message += "humidity ";
              message += bme.humidity;
              message += " ";

              // Serial.println("# HELP gas_resistance Gas Resistance in  KOhms"
              // Serial.println("# TYPE gas_resistance guage")
              message += "gas_resistance ";
              message += (bme.gas_resistance / 1000.0);
              message += " ";

              // Serial.println("# HELP approximate_altitude in meters KOhms"
              // Serial.println("# TYPE approximate_altitude guage")
              message += "approximate_altitude ";
              message += bme.readAltitude(SEALEVELPRESSURE_HPA);
              message += "\n";
              client.println(message);
            }
            else {
              Serial.println("NOT /metrics");

              // Display the HTML web page
              client.println("<!DOCTYPE html><html>");
              client.println("<head><meta name=\"viewport\" content=\"width=device-width, initial-scale=1\">");
              // CSS to style the on/off buttons 
              // Feel free to change the background-color and font-size attributes to fit your preferences
              client.println("<style>html { font-family: Helvetica; display: inline-block; margin: 0px auto; text-align: center;}");
              client.println(".button { background-color: #4CAF50; border: none; color: white; padding: 16px 40px;");
              client.println("text-decoration: none; font-size: 30px; margin: 2px; cursor: pointer;}");
              client.println(".button2 {background-color: #555555;}</style></head>");
              
              // Web Page Heading
              client.println("<body><h1>ESP32 Web Server</h1>");
              client.println("</body></html>");
              
              // The HTTP response ends with another blank line
              client.println();
            }
            break;
          } else { // if you got a newline, then clear currentLine
            currentLine = "";
          }
        } else if (c != '\r') {  // if you got anything else but a carriage return character,
          currentLine += c;      // add it to the end of the currentLine
        }
      }
    }
    // Clear the header variable
    header = "";
    // Close the connection
    client.stop();
    pixels.setPixelColor(0, pixels.Color(0, 255, 0)); //green
    pixels.show();
    Serial.println("Client disconnected.");
    Serial.println("");
  }
}