lookup() - Stack smashing protect failure!

[Shavo650]

Hi. lookup() function keeps crashing. I loaded example sketch and have tried to use this library but after compilation and upload to my ESP32 i get this:

Starting...
.
IP address: 192.168.33.15

Stack smashing protect failure!


Backtrace: 0x40082371:0x3ffb2040 0x4008be1d:0x3ffb2060 0x40082382:0x3ffb2080 0x400d6dfb:0x3ffb20a0 0x400d70d3:0x3ffb2200 0x400d343a:0x3ffb2220 0x400d9f04:0x3ffb2290

This is my code:

#include <WiFi.h>
#include <ArduinoJson.h>
#include "yeelight.h"

#define LED 2

StaticJsonDocument<200> jsonBuffer;
Yeelight* yeelight;

void connectToWiFi(const char * ssid, const char * pwd);

void setup() {
  Serial.begin(115200);
  pinMode(LED, OUTPUT);
  digitalWrite(LED, LOW);
  Serial.println("Starting...");

  connectToWifi("RandomSSID", "Stronkpassword");

  yeelight = new Yeelight();
  yeelight->lookup();
}

void loop() {
  if (yeelight->feedback()) {
    Serial.print("device: ");
    Serial.println(yeelight->getLocation());

    if (!yeelight->isPowered()) {
      digitalWrite(LED, HIGH);
      Serial.println(yeelight->sendCommand("set_power", "[\"on\", \"smooth\", 500]"));
      // Serial.println(yeelight->sendCommand("set_name", "[\"tv\"]"));
    }
    deserializeJson(jsonBuffer, yeelight->sendCommand("get_prop", "[\"power\", \"name\"]"));
    JsonObject root = jsonBuffer.as<JsonObject>();
    const char* state = root["result"][0];
    const char* name = root["result"][1];
    Serial.print("- power is: ");
    Serial.println(state);
    Serial.print("- name is: ");
    Serial.println(name);
  }
}

void connectToWifi(const char * ssid, const char * pwd)
{
  WiFi.begin(ssid, pwd);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(F("."));
  }

  Serial.println("");
  Serial.print("IP address: ");
  Serial.println(WiFi.localIP());
  
}

I already figured out that the problem is in the lookup() function. But i'm not sure how to fix it.

void Yeelight::lookup()
{
  #ifdef ESP32
    udp.beginMulticast(_ipMulti, 1982);
    udp.beginMulticastPacket();
  #else
    udp.beginMulticast(WiFi.localIP(), _ipMulti, 1982);
    udp.beginPacketMulticast(_ipMulti, 1982, WiFi.localIP());
  #endif
  udp.print("M-SEARCH * HTTP/1.1\r\nHOST: 239.255.255.250:1982\r\nMAN: \"ssdp:discover\"\r\nST: wifi_bulb");
  udp.endPacket();
  udp.begin(1982);
}