#include <Adafruit_NeoPixel.h>
#define PIN 5
//the Wemos WS2812B RGB shield has 1 LED connected to pin 2
Adafruit_NeoPixel pixels = Adafruit_NeoPixel(1, PIN, NEO_GRB + NEO_KHZ800);

const byte numChars = 32;
char receivedChars[numChars];
char tempChars[numChars];        // temporary array for use when parsing

      // variables to hold the parsed data

int redFromSender = 0;
int greenFromSender = 0;
int blueFromSender = 0;

boolean newData = false;
 
void setup() 
{
  pixels.begin(); // This initializes the NeoPixel library.
     Serial.begin(9600);
    Serial.println("This demo expects 3 pieces of data - text, an integer and a floating point value");
    Serial.println("Enter data in this style <HelloWorld, 12, 24.7>  ");
    Serial.println();
}
 
void loop() 
{
   recvWithStartEndMarkers();
    if (newData == true) {
        strcpy(tempChars, receivedChars);
            // this temporary copy is necessary to protect the original data
            //   because strtok() used in parseData() replaces the commas with \0
        parseData();
        showParsedData();
        newData = false;
    }
    setColor(0,redFromSender,greenFromSender,blueFromSender,100);
}
 
//simple function which takes values for the red, green and blue led and also
//a delay
void setColor(int led, int redValue, int greenValue, int blueValue, int delayValue)
{
  pixels.setPixelColor(led, pixels.Color(redValue, greenValue, blueValue)); 
  pixels.show();
  delay(delayValue);
}

void recvWithStartEndMarkers() {
    static boolean recvInProgress = false;
    static byte ndx = 0;
    char startMarker = '<';
    char endMarker = '>';
    char rc;

    while (Serial.available() > 0 && newData == false) {
        rc = Serial.read();

        if (recvInProgress == true) {
            if (rc != endMarker) {
                receivedChars[ndx] = rc;
                ndx++;
                if (ndx >= numChars) {
                    ndx = numChars - 1;
                }
            }
            else {
                receivedChars[ndx] = '\0'; // terminate the string
                recvInProgress = false;
                ndx = 0;
                newData = true;
            }
        }

        else if (rc == startMarker) {
            recvInProgress = true;
        }
    }
}

//============

void parseData() {      // split the data into its parts
    char * strtokIndx; // this is used by strtok() as an index
    strtokIndx = strtok(tempChars,",");      // get the first part - the string
    redFromSender = atoi(strtokIndx);
    strtokIndx = strtok(NULL, ","); // this continues where the previous call left off
    greenFromSender = atoi(strtokIndx);     // convert this part to an integer
    strtokIndx = strtok(NULL, ",");
    blueFromSender = atoi(strtokIndx);
}

//============

void showParsedData() {
    Serial.print("REd ");
    Serial.println(redFromSender);
    Serial.print("Green ");
    Serial.println(greenFromSender);
    Serial.print("Blue ");
    Serial.println(blueFromSender);
}