esp-idf v3.2 doesn't have these "message receive" and "check valid" methods. I've also encountered with the same problem and came up with the same workaround. case MQTT_MSG_TYPE_CONNACK: return (buffer[0] & 0x0f) == 0; case MQTT_MSG_TYPE_SUBACK: return (buffer[0] & 0x0f) == 0x02;

Hi Arkaik,

For what it's worth, there is an example mqtt client implementation which employs esp32's tcp/ip socket implementation ( uses lwip of esp32-idf).

It can be the case that you've already seen it but here it is: https://github.com/tuanpmt/espmqtt

Baris