| lwIP
    2.0.3
    Lightweight IP stack | 
#include "lwip/opt.h"| Macros | |
| #define | MQTT_OUTPUT_RINGBUF_SIZE 256 | 
| #define | MQTT_VAR_HEADER_BUFFER_LEN 128 | 
| #define | MQTT_REQ_MAX_IN_FLIGHT 4 | 
| #define | MQTT_CYCLIC_TIMER_INTERVAL 5 | 
| #define | MQTT_REQ_TIMEOUT 30 | 
| #define | MQTT_CONNECT_TIMOUT 100 | 
MQTT client options