ESP32 MQTT client stuck at client.subscribe() - arduino

Question

I'm trying to connect my ESP32 to mosquitto with MQTTClient but it get stuck when trying to subscribe to any topic and it won't recive messages. I've searched all the afternoon and can't find any solution. I've also tested the broker with MQTTBox and I can subscribe and publish just fine.
Here is the code uploaded to the NodeMCU:
#include <Arduino.h>
#include <MQTTClient.h>
#include "WiFi.h"
#include "secrets.h"
#include <WiFiManager.h>
WiFiClient net = WiFiClient();
MQTTClient client = MQTTClient(256);
void connectMQTT(){
WiFiManager wifiManager;
if(!wifiManager.autoConnect(WIFI_SSID,WIFI_PASSWORD)) {
Serial.println("failed to connect and hit timeout");
//reset and try again, or maybe put it to deep sleep
ESP.restart();
delay(1000);
}
Serial.println("Connected to Wi-Fi");
// Connect to the MQTT broker
client.begin(MQTT_ENDPOINT, MQTT_PORT, net);
// Create a message handler
client.onMessage(messageHandler);
Serial.println("Connecting to MQTT");
while (!client.connect(THINGNAME)) {
Serial.print(".");
delay(100);
}
if(!client.connected()){
Serial.println("MQTT Timeout!");
return;
}
Serial.println("MQTT Connected!");
Serial.println("Subscribing to irtopic");
// Subscribe to topics
client.subscribe("esp32/ir");
Serial.println("");
Serial.println("Success!");
}
void setup() {
Serial.begin(115200);
connectMQTT();
}
And the serial output:
*WM:
*WM: AutoConnect
*WM: Connecting as wifi client...
*WM: Using last saved values, should be faster
*WM: Connection result:
*WM: 3
*WM: IP Address:
*WM: 192.168.0.155
Connected to Wi-Fi
Connecting to MQTT
MQTT Connected!
Subscribing to irtopic