test.ino

void ShowFrame(char * s, int r, int g, int b){
  pixels.clear();
  delay(10);
  char* command = strtok(s, "&");
  
  while (command != NULL)
  {

    int num = atoi(command);
    Serial.println(num);
    pixels.setPixelColor(num, pixels.Color(r, g, b, 0));

    command = strtok(NULL, "&");
  }
  
    pixels.show();
    

}