void setup()
{
    char input[] = {"id,port,password,ssid,delay,flag,class,category"};
    char *ptr;
    Serial.begin(115200);

    char *id = strtok(input, ",");
    char *port = strtok(NULL, ",");
    char *password = strtok(NULL, ",");
    char *ssid = strtok(NULL, ",");
    char *delay = strtok(NULL, ",");
    char *flag = strtok(NULL, ",");
    char *class = strtok(NULL, ",");
    char *category = strtok(NULL, ",");
    if (category != NULL) { // Everything up to and including category worked
        Serial.print("Flag: ");
        Serial.println(flag);
    }
}

void loop(){}