paho mqtt port does not send PUBLISH_COMPLETE message for QoS 2

[YehonatanLiron]

The "cycle" function does not handle PUBLISH_RELEASE messages by sending PUBLISH_COMPLETE, so QoS 2 exchanges are not completed.

case MQTTPACKET_PUBREL:

        {
            unsigned short mypacketid;
            unsigned char dup, type;
            if (mqtt_deserialize_ack(&type, &dup, &mypacketid, c->readbuf, c->readbuf_size) != 1)
            {
                rc = MQTT_FAILURE;
            }
            else if ((len = mqtt_serialize_ack(c->buf, c->buf_size, MQTTPACKET_PUBCOMP, 0, mypacketid)) <= 0)
            {
                rc = MQTT_FAILURE;
            }
            else if ((rc = send_packet(c, len, timer)) != MQTT_SUCCESS) // send the MQTTPACKET_PUBCOMP packet
            {
                rc = MQTT_FAILURE; // there was a problem
            }
            if (rc == MQTT_FAILURE)
                goto exit; // there was a problem
            break;
        }

[lahirue]

Can you send me the flashing steps for esp mqtt client ?