lwipopts.h

/**
 * @file
 *
 * lwIP Options Configuration
 */

/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 */

#ifndef LWIPOPTS_H_
#define LWIPOPTS_H_

 /*
   ------------------------------------
   -------------- NO SYS --------------
   ------------------------------------
*/
/**
 * NO_SYS==1: Use lwIP without OS-awareness (no thread, semaphores, mutexes or
 * mboxes). This means threaded APIs cannot be used (socket, netconn,
 * i.e. everything in the 'api' folder), only the callback-style raw API is
 * available (and you have to watch out for yourself that you don't access
 * lwIP functions/structures from more than one context at a time!)
 */
#ifndef NO_SYS
#define NO_SYS                          1
#endif


/**
 * NO_SYS_NO_TIMERS==1: Drop support for sys_timeout when NO_SYS==1
 * Mainly for compatibility to old versions.
 */
#ifndef NO_SYS_NO_TIMERS
#define NO_SYS_NO_TIMERS                0
#endif

/**
 * LWIP_TIMERS==0: Drop support for sys_timeout and lwip-internal cyclic timers.
 * (the array of lwip-internal cyclic timers is still provided)
 * (check NO_SYS_NO_TIMERS for compatibility to old versions)
 */
#define LWIP_TIMERS 1

/**
 * LWIP_TIMERS_CUSTOM==1: Provide your own timer implementation.
 * Function prototypes in timeouts.h and the array of lwip-internal cyclic timers
 * are still included, but the implementation is not. The following functions
 * will be required: sys_timeouts_init(), sys_timeout(), sys_untimeout(),
 *                   sys_timeouts_mbox_fetch()
 */
#if !defined LWIP_TIMERS_CUSTOM
#define LWIP_TIMERS_CUSTOM              0
#endif

/*
   ------------------------------------
   ----------- Core locking -----------
   ------------------------------------
*/

/**
 * SYS_LIGHTWEIGHT_PROT==1: enable inter-task protection (and task-vs-interrupt
 * protection) for certain critical regions during buffer allocation, deallocation
 * and memory allocation and deallocation.
 * ATTENTION: This is required when using lwIP from more than one context! If
 * you disable this, you must be sure what you are doing!
 */
#ifndef SYS_LIGHTWEIGHT_PROT
#define SYS_LIGHTWEIGHT_PROT            0
#endif


/*
 ------------------------------------
 ---------- Memory options ----------
 ------------------------------------
 */
/**
 * MEM_LIBC_MALLOC==1: Use malloc/free/realloc provided by your C-library
 * instead of the lwip internal allocator. Can save code size if you
 * already use it.
 */
#ifndef MEM_LIBC_MALLOC
#define MEM_LIBC_MALLOC                 0
#endif

/**
 * MEMP_MEM_MALLOC==1: Use mem_malloc/mem_free instead of the lwip pool allocator.
 * Especially useful with MEM_LIBC_MALLOC but handle with care regarding execution
 * speed and usage from interrupts!
 */
#ifndef MEMP_MEM_MALLOC
#define MEMP_MEM_MALLOC                 1
#endif

/**
 * MEM_ALIGNMENT: should be set to the alignment of the CPU
 *    4 byte alignment -> #define MEM_ALIGNMENT 4
 *    2 byte alignment -> #define MEM_ALIGNMENT 2
 */
#ifndef MEM_ALIGNMENT
#define MEM_ALIGNMENT                   32
#endif

/**
 * MEM_SIZE: the size of the heap memory. If the application will send
 * a lot of data that needs to be copied, this should be set high.
 */
#ifndef MEM_SIZE
#define MEM_SIZE                        (15*1024)
#endif


/**
 * MEMP_OVERFLOW_CHECK: memp overflow protection reserves a configurable
 * amount of bytes before and after each memp element in every pool and fills
 * it with a prominent default value.
 *    MEMP_OVERFLOW_CHECK == 0 no checking
 *    MEMP_OVERFLOW_CHECK == 1 checks each element when it is freed
 *    MEMP_OVERFLOW_CHECK >= 2 checks each element in every pool every time
 *      memp_malloc() or memp_free() is called (useful but slow!)
 */
#ifndef MEMP_OVERFLOW_CHECK
#define MEMP_OVERFLOW_CHECK             0
#endif

/**
 * MEMP_SANITY_CHECK==1: run a sanity check after each memp_free() to make
 * sure that there are no cycles in the linked lists.
 */
#ifndef MEMP_SANITY_CHECK
#define MEMP_SANITY_CHECK               1
#endif

/**
 * MEM_USE_POOLS==1: Use an alternative to malloc() by allocating from a set
 * of memory pools of various sizes. When mem_malloc is called, an element of
 * the smallest pool that can provide the length needed is returned.
 * To use this, MEMP_USE_CUSTOM_POOLS also has to be enabled.
 */
#ifndef MEM_USE_POOLS
#define MEM_USE_POOLS                   0
#endif

/**
 * MEM_USE_POOLS_TRY_BIGGER_POOL==1: if one malloc-pool is empty, try the next
 * bigger pool - WARNING: THIS MIGHT WASTE MEMORY but it can make a system more
 * reliable. */
#ifndef MEM_USE_POOLS_TRY_BIGGER_POOL
#define MEM_USE_POOLS_TRY_BIGGER_POOL   0
#endif

/**
 * MEMP_USE_CUSTOM_POOLS==1: whether to include a user file lwippools.h
 * that defines additional pools beyond the "standard" ones required
 * by lwIP. If you set this to 1, you must have lwippools.h in your
 * inlude path somewhere.
 */
#ifndef MEMP_USE_CUSTOM_POOLS
#define MEMP_USE_CUSTOM_POOLS           0
#endif

/**
 * Set this to 1 if you want to free PBUF_RAM pbufs (or call mem_free()) from
 * interrupt context (or another context that doesn't allow waiting for a
 * semaphore).
 * If set to 1, mem_malloc will be protected by a semaphore and SYS_ARCH_PROTECT,
 * while mem_free will only use SYS_ARCH_PROTECT. mem_malloc SYS_ARCH_UNPROTECTs
 * with each loop so that mem_free can run.
 *
 * ATTENTION: As you can see from the above description, this leads to dis-/
 * enabling interrupts often, which can be slow! Also, on low memory, mem_malloc
 * can need longer.
 *
 * If you don't want that, at least for NO_SYS=0, you can still use the following
 * functions to enqueue a deallocation call which then runs in the tcpip_thread
 * context:
 * - pbuf_free_callback(p);
 * - mem_free_callback(m);
 */
#ifndef LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT
#define LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT 0
#endif

/*
   ------------------------------------
   ---------- Socket options ----------
   ------------------------------------
*/
/**
 * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
 */
#define LWIP_SOCKET 0
/**
 * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names through defines.
 * LWIP_COMPAT_SOCKETS==2: Same as ==1 but correctly named functions are created.
 * While this helps code completion, it might conflict with existing libraries.
 * (only used if you use sockets.c)
 */
#define LWIP_COMPAT_SOCKETS 0

/*
   ----------------------------------------------
   ---------- Sequential layer options ----------
   ----------------------------------------------
*/
/**
 * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
 */
#define LWIP_NETCONN 0


 /** LWIP_TCPIP_TIMEOUT==1: Enable tcpip_timeout/tcpip_untimeout tod create
 * timers running in tcpip_thread from another thread.
 */
#ifndef LWIP_TCPIP_TIMEOUT
#define LWIP_TCPIP_TIMEOUT              1
#endif

/**
 * LWIP_TCP_KEEPALIVE==1: Enable TCP_KEEPIDLE, TCP_KEEPINTVL and TCP_KEEPCNT
 * options processing. Note that TCP_KEEPIDLE and TCP_KEEPINTVL have to be set
 * in seconds. (does not require sockets.c, and will affect tcp.c)
 */
#define LWIP_TCP_KEEPALIVE 0

/*
 ------------------------------------------------
 ---------- Internal Memory Pool Sizes ----------
 ------------------------------------------------
 */
/**
 * MEMP_NUM_PBUF: the number of memp struct pbufs (used for PBUF_ROM and PBUF_REF).
 * If the application sends a lot of data out of ROM (or other static memory),
 * this should be set high.
 */
#ifndef MEMP_NUM_PBUF
#ifdef DEBUG
#define MEMP_NUM_PBUF                   4
#else
#define MEMP_NUM_PBUF                   8
#endif
#endif

/**
 * MEMP_NUM_RAW_PCB: Number of raw connection PCBs
 * (requires the LWIP_RAW option)
 */
#ifndef MEMP_NUM_RAW_PCB
#define MEMP_NUM_RAW_PCB                4
#endif

/**
 * MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One
 * per active UDP "connection".
 * (requires the LWIP_UDP option)
 */
#ifndef MEMP_NUM_UDP_PCB
#define MEMP_NUM_UDP_PCB                3
#endif

/**
 * MEMP_NUM_TCP_PCB: the number of simulatenously active TCP connections.
 * (requires the LWIP_TCP option)
 */
#ifndef MEMP_NUM_TCP_PCB
#define MEMP_NUM_TCP_PCB                5
#endif

/**
 * MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP connections.
 * (requires the LWIP_TCP option)
 */
#ifndef MEMP_NUM_TCP_PCB_LISTEN
#define MEMP_NUM_TCP_PCB_LISTEN         3
#endif

/**
 * MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP segments.
 * (requires the LWIP_TCP option)
 */
#ifndef MEMP_NUM_TCP_SEG
#define MEMP_NUM_TCP_SEG                16
#endif

/**
 * MEMP_NUM_REASSDATA: the number of IP packets simultaneously queued for
 * reassembly (whole packets, not fragments!)
 */
#ifndef MEMP_NUM_REASSDATA
#define MEMP_NUM_REASSDATA              5
#endif

/**
 * MEMP_NUM_FRAG_PBUF: the number of IP fragments simultaneously sent
 * (fragments, not whole packets!).
 * This is only used with IP_FRAG_USES_STATIC_BUF==0 and
 * LWIP_NETIF_TX_SINGLE_PBUF==0 and only has to be > 1 with DMA-enabled MACs
 * where the packet is not yet sent when netif->output returns.
 */
#ifndef MEMP_NUM_FRAG_PBUF
#define MEMP_NUM_FRAG_PBUF              15
#endif

/**
 * MEMP_NUM_ARP_QUEUE: the number of simulateously queued outgoing
 * packets (pbufs) that are waiting for an ARP request (to resolve
 * their destination address) to finish.
 * (requires the ARP_QUEUEING option)
 */
#ifndef MEMP_NUM_ARP_QUEUE
#define MEMP_NUM_ARP_QUEUE              0
#endif

/**
 * MEMP_NUM_IGMP_GROUP: The number of multicast groups whose network interfaces
 * can be members et the same time (one per netif - allsystems group -, plus one
 * per netif membership).
 * (requires the LWIP_IGMP option)
 */
#ifndef MEMP_NUM_IGMP_GROUP
#define MEMP_NUM_IGMP_GROUP             0
#endif

/**
 * The number of sys timeouts used by the core stack (not apps)
 * The default number of timeouts is calculated here for all enabled modules.
 */
#define LWIP_NUM_SYS_TIMEOUT_INTERNAL   (LWIP_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_ACD + LWIP_IGMP + LWIP_DNS + PPP_NUM_TIMEOUTS + (LWIP_IPV6 * (1 + LWIP_IPV6_REASS + LWIP_IPV6_MLD + LWIP_IPV6_DHCP6)))

/**
 * MEMP_NUM_SYS_TIMEOUT: the number of simultaneously active timeouts.
 * The default number of timeouts is calculated here for all enabled modules.
 * The formula expects settings to be either '0' or '1'.
 */
#ifndef MEMP_NUM_SYS_TIMEOUT
#define MEMP_NUM_SYS_TIMEOUT            LWIP_NUM_SYS_TIMEOUT_INTERNAL
#endif

/**
 * MEMP_NUM_NETBUF: the number of struct netbufs.
 * (only needed if you use the sequential API, like api_lib.c)
 */
#ifndef MEMP_NUM_NETBUF
#define MEMP_NUM_NETBUF                 0
#endif

/**
 * MEMP_NUM_NETCONN: the number of struct netconns.
 * (only needed if you use the sequential API, like api_lib.c)
 */
#ifndef MEMP_NUM_NETCONN
#define MEMP_NUM_NETCONN                0
#endif

/**
 * MEMP_NUM_TCPIP_MSG_API: the number of struct tcpip_msg, which are used
 * for callback/timeout API communication.
 * (only needed if you use tcpip.c)
 */
#ifndef MEMP_NUM_TCPIP_MSG_API
#define MEMP_NUM_TCPIP_MSG_API          0
#endif

/**
 * MEMP_NUM_TCPIP_MSG_INPKT: the number of struct tcpip_msg, which are used
 * for incoming packets.
 * (only needed if you use tcpip.c)
 */
#ifndef MEMP_NUM_TCPIP_MSG_INPKT
#define MEMP_NUM_TCPIP_MSG_INPKT        0
#endif


/**
 * MEMP_NUM_NETDB: the number of concurrently running lwip_addrinfo() calls
 * (before freeing the corresponding memory using lwip_freeaddrinfo()).
 */
#ifndef MEMP_NUM_NETDB
#define MEMP_NUM_NETDB                  0
#endif

/**
 * MEMP_NUM_LOCALHOSTLIST: the number of host entries in the local host list
 * if DNS_LOCAL_HOSTLIST_IS_DYNAMIC==1.
 */
#ifndef MEMP_NUM_LOCALHOSTLIST
#define MEMP_NUM_LOCALHOSTLIST          0
#endif


/**
 * PBUF_POOL_SIZE: the number of buffers in the pbuf pool.
 */
#ifndef PBUF_POOL_SIZE
#define PBUF_POOL_SIZE                  16
#endif

#ifndef LWIP_SUPPORT_CUSTOM_PBUF
#define LWIP_SUPPORT_CUSTOM_PBUF        1
#endif

/**
 * PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. The default is
 * designed to accommodate single full size TCP frame in one pbuf, including
 * TCP_MSS, IP header, and link header.
 */
#define PBUF_POOL_BUFSIZE 1700

/**
 * PBUF_LINK_HLEN: the number of bytes that should be allocated for a
 * link level header. The default is 14, the standard value for
 * Ethernet.
 */
#define PBUF_LINK_HLEN 16

/*
   ---------------------------------
   ---------- ARP options ----------
   ---------------------------------
*/

/**
 * ARP_TABLE_SIZE: Number of active MAC-IP address pairs cached.
 */
#define ARP_TABLE_SIZE 10
/**
 * ARP_QUEUEING==1: Multiple outgoing packets are queued during hardware address
 * resolution. By default, only the most recent packet is queued per IP address.
 * This is sufficient for most protocols and mainly reduces TCP connection
 * startup time. Set this to 1 if you know your application sends more than one
 * packet in a row to an IP address that is not in the ARP cache.
 */
#define ARP_QUEUEING 1

/*
   ----------------------------------
   ---------- ICMP options ----------
   ----------------------------------
*/
/**
 * ICMP_TTL: Default value for Time-To-Live used by ICMP packets.
 */
#define ICMP_TTL 255

/*
   --------------------------------
   ---------- IP options ----------
   --------------------------------
*/
/**
 * IP_OPTIONS_ALLOWED: Defines the behavior for IP options.
 *      IP_OPTIONS_ALLOWED==0: All packets with IP options are dropped.
 *      IP_OPTIONS_ALLOWED==1: IP options are allowed (but not parsed).
 */
#if !defined IP_OPTIONS_ALLOWED
#define IP_OPTIONS_ALLOWED              0
#endif


/**
 * IP_FORWARD==1: Enables the ability to forward IP packets across network
 * interfaces. If you are going to run lwIP on a device with only one network
 * interface, define this to 0.
 */
#define IP_FORWARD 0

/**
 * IP_REASSEMBLY==1: Reassemble incoming fragmented IP packets. Note that
 * this option does not affect outgoing packet sizes, which can be controlled
 * via IP_FRAG.
 */
#define IP_REASSEMBLY 1

/**
 * IP_FRAG==1: Fragment outgoing IP packets if their size exceeds MTU. Note
 * that this option does not affect incoming packet sizes, which can be
 * controlled via IP_REASSEMBLY.
 */
#define IP_FRAG 1

/**
 * IP_REASS_MAX_PBUFS: Total maximum amount of pbufs waiting to be reassembled.
 * Since the received pbufs are enqueued, be sure to configure
 * PBUF_POOL_SIZE > IP_REASS_MAX_PBUFS so that the stack is still able to receive
 * packets even if the maximum amount of fragments is enqueued for reassembly!
 * When IPv4 *and* IPv6 are enabled, this even changes to
 * (PBUF_POOL_SIZE > 2 * IP_REASS_MAX_PBUFS)!
 */
#define IP_REASS_MAX_PBUFS 128

/**
 * IP_DEFAULT_TTL: Default value for Time-To-Live used by transport layers.
 */
#define IP_DEFAULT_TTL 255


/*
   ---------------------------------
   ---------- UDP options ----------
   ---------------------------------
*/

/**
 * LWIP_UDP==1: Turn on UDP.
 */
#define LWIP_UDP 1

/**
 * UDP_TTL: Default Time-To-Live value.
 */
#define UDP_TTL 255

/*
   ---------------------------------
   ---------- TCP options ----------
   ---------------------------------
*/

/**
 * LWIP_TCP==1: Turn on TCP.
 */
#define LWIP_TCP 1

/**
 * TCP_MSS: TCP Maximum segment size. (default is 536, a conservative default,
 * you might want to increase this.)
 * For the receive side, this MSS is advertised to the remote side
 * when opening a connection. For the transmit size, this MSS sets
 * an upper limit on the MSS advertised by the remote host.
 */
#ifndef TCP_MSS
#define TCP_MSS                        1420
#endif

/**
 * TCP_CALCULATE_EFF_SEND_MSS: "The maximum size of a segment that TCP really
 * sends, the 'effective send MSS,' MUST be the smaller of the send MSS (which
 * reflects the available reassembly buffer size at the remote host) and the
 * largest size permitted by the IP layer" (RFC 1122)
 * Setting this to 1 enables code that checks TCP_MSS against the MTU of the
 * netif used for a connection and limits the MSS if it would be too big otherwise.
 */
#ifndef TCP_CALCULATE_EFF_SEND_MSS
#define TCP_CALCULATE_EFF_SEND_MSS      1
#endif

/**
 * TCP_SND_BUF: TCP sender buffer space (bytes).
 * To achieve good performance, this should be at least 2 * TCP_MSS.
 */
#ifndef TCP_SND_BUF
#define TCP_SND_BUF                     (4 * TCP_MSS)
#endif

/**
 * TCP_WND: The size of a TCP window.  This must be at least
 * (2 * TCP_MSS) for things to work well.
 * ATTENTION: when using TCP_RCV_SCALE, TCP_WND is the total size
 * with scaling applied. Maximum window value in the TCP header
 * will be TCP_WND >> TCP_RCV_SCALE
 */
#ifndef TCP_WND
#define TCP_WND                         (4 * TCP_MSS)
#endif

/**
 * TCP_TTL: Default Time-To-Live value.
 */
#define TCP_TTL 255

/**
 * TCP_MAXRTX: Maximum number of retransmissions of data segments.
 */
#ifndef TCP_MAXRTX
#define TCP_MAXRTX                      12
#endif

/**
 * TCP_SYNMAXRTX: Maximum number of retransmissions of SYN segments.
 */
#ifndef TCP_SYNMAXRTX
#define TCP_SYNMAXRTX                   6
#endif

/**
 * TCP_QUEUE_OOSEQ==1: TCP will queue segments that arrive out of order.
 * Define to 0 if your device is low on memory.
 */
#ifndef TCP_QUEUE_OOSEQ
#define TCP_QUEUE_OOSEQ                 (LWIP_TCP)
#endif

/**
 * TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least
 * as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work.
 */
#ifndef TCP_SND_QUEUELEN
#define TCP_SND_QUEUELEN                ((4 * (TCP_SND_BUF) + (TCP_MSS - 1))/(TCP_MSS))
#endif

/**
 * LWIP_NETIF_HOSTNAME==1: use DHCP_OPTION_HOSTNAME with netif's hostname
 * field.
 */
#ifndef LWIP_NETIF_HOSTNAME
#define LWIP_NETIF_HOSTNAME 1
#endif

/**
 * TCP_OVERSIZE: The maximum number of bytes that tcp_write may
 * allocate ahead of time in an attempt to create shorter pbuf chains
 * for transmission. The meaningful range is 0 to TCP_MSS. Some
 * suggested values are:
 *
 * 0:         Disable oversized allocation. Each tcp_write() allocates a new
              pbuf (old behaviour).
 * 1:         Allocate size-aligned pbufs with minimal excess. Use this if your
 *            scatter-gather DMA requires aligned fragments.
 * 128:       Limit the pbuf/memory overhead to 20%.
 * TCP_MSS:   Try to create unfragmented TCP packets.
 * TCP_MSS/4: Try to create 4 fragments or less per TCP packet.
 */
#ifndef TCP_OVERSIZE
#define TCP_OVERSIZE                    TCP_MSS
#endif

/*
 ---------------------------------
 ---------- RAW options ----------
 ---------------------------------
 */
/**
 * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
 */
#ifndef LWIP_RAW
#define LWIP_RAW                0
#endif

/*
   --------------------------------------
   ---------- Checksum options ----------
   --------------------------------------
*/
/**
 * CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.
 */
#define CHECKSUM_GEN_TCP 	1

/**
 * CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.
 */
#define CHECKSUM_GEN_UDP 	1

/**
 * CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.
 */
#define CHECKSUM_GEN_IP  	1

/**
 * CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.
 */
#define CHECKSUM_CHECK_TCP      1

/**
 * CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.
 */
#define CHECKSUM_CHECK_UDP      1

/**
 * CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.
 */
#define CHECKSUM_CHECK_IP 	1

/*
   ----------------------------------------
   ---------- Statistics options ----------
   ----------------------------------------
*/

/**
 * MIB2_STATS==1: Stats for SNMP MIB2.
 */
#if !defined MIB2_STATS
#define MIB2_STATS                      1
#endif

/*
   ------------------------------------------------
   ---------- Internal Memory Pool Sizes ----------
   ------------------------------------------------
*/
/**
 * MEMP_NUM_FRAG_PBUF: the number of IP fragments simultaneously sent
 * (fragments, not whole packets!).
 * This is only used with LWIP_NETIF_TX_SINGLE_PBUF==0 and only has to be > 1
 * with DMA-enabled MACs where the packet is not yet sent when netif->output
 * returns.
 */
#ifndef MEMP_NUM_FRAG_PBUF
#define MEMP_NUM_FRAG_PBUF              0
#endif


/*
   ----------------------------------
   ---------- DHCP options ----------
   ----------------------------------
*/
/**
 * LWIP_DHCP==1: Enable DHCP module.
 */
#define LWIP_DHCP                       1

/*
   ----------------------------------
   ---------- DNS  options ----------
   ----------------------------------
*/
/**
 * LWIP_DNS==1: Enable DNS module.
 */
#define LWIP_DNS                        1

/*
   ----------------------------------
   --------- DEBUG options ----------
   ----------------------------------
*/
/**
 * LWIP_DEBUG==1: Enable Debug.
 */

#define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_ALL

#define LWIP_DEBUG                      0

#define ETHARP_DEBUG                    LWIP_DBG_OFF
#define NETIF_DEBUG                     LWIP_DBG_OFF
#define PBUF_DEBUG                      LWIP_DBG_OFF
#define API_LIB_DEBUG                   LWIP_DBG_OFF
#define API_MSG_DEBUG                   LWIP_DBG_OFF
#define SOCKETS_DEBUG                   LWIP_DBG_OFF
#define ICMP_DEBUG                      LWIP_DBG_OFF
#define IGMP_DEBUG                      LWIP_DBG_OFF
#define INET_DEBUG                      LWIP_DBG_OFF
#define IP_DEBUG                        LWIP_DBG_OFF
#define IP_REASS_DEBUG                  LWIP_DBG_OFF
#define RAW_DEBUG                       LWIP_DBG_OFF
#define MEM_DEBUG                       LWIP_DBG_OFF
#define MEMP_DEBUG                      LWIP_DBG_OFF
#define SYS_DEBUG                       LWIP_DBG_OFF
#define TIMERS_DEBUG                    LWIP_DBG_OFF
#define TCP_DEBUG                       LWIP_DBG_OFF
#define TCP_INPUT_DEBUG                 LWIP_DBG_OFF
#define TCP_FR_DEBUG                    LWIP_DBG_OFF
#define TCP_RTO_DEBUG                   LWIP_DBG_OFF
#define TCP_CWND_DEBUG                  LWIP_DBG_OFF
#define TCP_WND_DEBUG                   LWIP_DBG_OFF
#define TCP_OUTPUT_DEBUG                LWIP_DBG_OFF
#define TCP_RST_DEBUG                   LWIP_DBG_OFF
#define TCP_QLEN_DEBUG                  LWIP_DBG_OFF
#define UDP_DEBUG                       LWIP_DBG_OFF
#define TCPIP_DEBUG                     LWIP_DBG_OFF
#define SLIP_DEBUG                      LWIP_DBG_OFF
#define DHCP_DEBUG                      LWIP_DBG_OFF
#define AUTOIP_DEBUG                    LWIP_DBG_OFF
#define ACD_DEBUG                       LWIP_DBG_OFF
#define DNS_DEBUG                       LWIP_DBG_OFF
#define IP6_DEBUG                       LWIP_DBG_OFF
#define DHCP6_DEBUG                     LWIP_DBG_OFF
#endif

//#define LWIP_USE_EXTERNAL_MBEDTLS       1