lwipopts.h

#ifndef _LWIPOPTS_H
#define _LWIPOPTS_H

// Need more memory for TLS
#ifdef MQTT_CERT_INC
#define MEM_SIZE 8000
#endif

// Generally you would define your own explicit list of lwIP options
// (see https://www.nongnu.org/lwip/2_1_x/group__lwip__opts.html)
//
// This example uses a common include to avoid repetition
#include "lwipopts_examples_common.h"

#define MEMP_NUM_SYS_TIMEOUT        (LWIP_NUM_SYS_TIMEOUT_INTERNAL+1)

#ifdef MQTT_CERT_INC
#define LWIP_ALTCP               1
#define LWIP_ALTCP_TLS           1
#define LWIP_ALTCP_TLS_MBEDTLS   1
#ifndef NDEBUG
#define ALTCP_MBEDTLS_DEBUG  LWIP_DBG_ON
#endif
/* TCP WND must be at least 16 kb to match TLS record size
   or you will get a warning "altcp_tls: TCP_WND is smaller than the RX decrypion buffer, connection RX might stall!" */
#undef TCP_WND
#define TCP_WND  16384
#endif // MQTT_CERT_INC

// This defaults to 4
#define MQTT_REQ_MAX_IN_FLIGHT 5

#endif