text: /****************************************************************************
   *
   * Copyright 2016 Samsung Electronics All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
   * either express or implied. See the License for the specific
   * language governing permissions and limitations under the License.
   *
   ****************************************************************************/
  /*
   * 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>
   *
   */
  /**
   * @file
   *
   * lwIP Options Configuration
   */
  
  #ifndef __LWIP_OPT_H__
  #define __LWIP_OPT_H__
  /*
   * Include user defined options first. Anything not defined in these files
   * will be set to standard values. Override anything you don't like!
   */
  #include <net/lwip/lwipopts.h>
  
  /*
     -----------------------------------------------
     ---------- Platform specific locking ----------
     -----------------------------------------------
  */
  
  /**
   * SYS_LIGHTWEIGHT_PROT==1: if you want inter-task protection for certain
   * critical regions during buffer allocation, deallocation and memory
   * allocation and deallocation.
   */
  #ifndef SYS_LIGHTWEIGHT_PROT
  #define SYS_LIGHTWEIGHT_PROT            0
  #endif
  
  /**
   * NO_SYS==1: Provides VERY minimal functionality. Otherwise,
   * use lwIP facilities.
   */
  #ifndef NO_SYS
  #define NO_SYS                          0
  #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
  
  /**
   * MEMCPY: override this if you have a faster implementation at hand than the
   * one included in your C library
   */
  #ifndef MEMCPY
  #define MEMCPY(dst, src, len)           memcpy(dst, src, len)
  #endif
  
  /**
   * SMEMCPY: override this with care! Some compilers (e.g. gcc) can inline a
   * call to memcpy() if the length is known at compile time and is small.
   */
  #ifndef SMEMCPY
  #define SMEMCPY(dst, src, len)          memcpy(dst, src, len)
  #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                 0
  #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                   1
  #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                        1600
  #endif
  
  /**
   * MEMP_SEPARATE_POOLS: if defined to 1, each pool is placed in its own array.
   * This can be used to individually change the location of each pool.
   * Default is one big array for all pools
   */
  #ifndef MEMP_SEPARATE_POOLS
  #define MEMP_SEPARATE_POOLS             0
  #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               0
  #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
   * include 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
  
  /*
     ------------------------------------------------
     ---------- 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
  #define MEMP_NUM_PBUF                   16
  #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                4
  #endif
  
  /**
   * MEMP_NUM_TCP_PCB: the number of simultaneously 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         8
  #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 simultaneously 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              30
  #endif
  
  /**
   * MEMP_NUM_IGMP_GROUP: The number of multicast groups whose network interfaces
   * can be members at 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             8
  #endif
  
  /**
   * 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_TCP + IP_REASSEMBLY + LWIP_ARP + (2*LWIP_DHCP) + LWIP_AUTOIP + LWIP_IGMP + PPP_SUPPORT)
  #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                 2
  #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                4
  #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          8
  #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        8
  #endif
  
  /**
   * MEMP_NUM_SNMP_NODE: the number of leafs in the SNMP tree.
   */
  #ifndef MEMP_NUM_SNMP_NODE
  #define MEMP_NUM_SNMP_NODE              50
  #endif
  
  /**
   * MEMP_NUM_SNMP_ROOTNODE: the number of branches in the SNMP tree.
   * Every branch has one leaf (MEMP_NUM_SNMP_NODE) at least!
   */
  #ifndef MEMP_NUM_SNMP_ROOTNODE
  #define MEMP_NUM_SNMP_ROOTNODE          30
  #endif
  
  /**
   * MEMP_NUM_SNMP_VARBIND: the number of concurrent requests (does not have to
   * be changed normally) - 2 of these are used per request (1 for input,
   * 1 for output)
   */
  #ifndef MEMP_NUM_SNMP_VARBIND
  #define MEMP_NUM_SNMP_VARBIND           2
  #endif
  
  /**
   * MEMP_NUM_SNMP_VALUE: the number of OID or values concurrently used
   * (does not have to be changed normally) - 3 of these are used per request
   * (1 for the value read and 2 for OIDs - input and output)
   */
  #ifndef MEMP_NUM_SNMP_VALUE
  #define MEMP_NUM_SNMP_VALUE             3
  #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                  1
  #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          1
  #endif
  
  /**
   * MEMP_NUM_PPPOE_INTERFACES: the number of concurrently active PPPoE
   * interfaces (only used with PPPOE_SUPPORT==1)
   */
  #ifndef MEMP_NUM_PPPOE_INTERFACES
  #define MEMP_NUM_PPPOE_INTERFACES       1
  #endif
  
  /**
   * PBUF_POOL_SIZE: the number of buffers in the pbuf pool.
   */
  #ifndef PBUF_POOL_SIZE
  #define PBUF_POOL_SIZE                  16
  #endif
  
  /*
     ---------------------------------
     ---------- ARP options ----------
     ---------------------------------
  */
  /**
   * LWIP_ARP==1: Enable ARP functionality.
   */
  #ifndef LWIP_ARP
  #define LWIP_ARP                        1
  #endif
  
  /**
   * ARP_TABLE_SIZE: Number of active MAC-IP address pairs cached.
   */
  #ifndef ARP_TABLE_SIZE
  #define ARP_TABLE_SIZE                  10
  #endif
  
  /**
   * 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.
   */
  #ifndef ARP_QUEUEING
  #define ARP_QUEUEING                    0
  #endif
  
  /**
   * ETHARP_TRUST_IP_MAC==1: Incoming IP packets cause the ARP table to be
   * updated with the source MAC and IP addresses supplied in the packet.
   * You may want to disable this if you do not trust LAN peers to have the
   * correct addresses, or as a limited approach to attempt to handle
   * spoofing. If disabled, lwIP will need to make a new ARP request if
   * the peer is not already in the ARP table, adding a little latency.
   * The peer *is* in the ARP table if it requested our address before.
   * Also notice that this slows down input processing of every IP packet!
   */
  #ifndef ETHARP_TRUST_IP_MAC
  #define ETHARP_TRUST_IP_MAC             0
  #endif
  
  /**
   * ETHARP_SUPPORT_VLAN==1: support receiving ethernet packets with VLAN header.
   * Additionally, you can define ETHARP_VLAN_CHECK to an u16_t VLAN ID to check.
   * If ETHARP_VLAN_CHECK is defined, only VLAN-traffic for this VLAN is accepted.
   * If ETHARP_VLAN_CHECK is not defined, all traffic is accepted.
   * Alternatively, define a function/define ETHARP_VLAN_CHECK_FN(eth_hdr, vlan)
   * that returns 1 to accept a packet or 0 to drop a packet.
   */
  #ifndef ETHARP_SUPPORT_VLAN
  #define ETHARP_SUPPORT_VLAN             0
  #endif
  
  /** LWIP_ETHERNET==1: enable ethernet support for PPPoE even though ARP
   * might be disabled
   */
  #ifndef LWIP_ETHERNET
  #define LWIP_ETHERNET                   (LWIP_ARP || PPPOE_SUPPORT)
  #endif
  
  /** ETH_PAD_SIZE: number of bytes added before the ethernet header to ensure
   * alignment of payload after that header. Since the header is 14 bytes long,
   * without this padding e.g. addresses in the IP header will not be aligned
   * on a 32-bit boundary, so setting this to 2 can speed up 32-bit-platforms.
   */
  #ifndef ETH_PAD_SIZE
  #define ETH_PAD_SIZE                    0
  #endif
  
  /** ETHARP_SUPPORT_STATIC_ENTRIES==1: enable code to support static ARP table
   * entries (using etharp_add_static_entry/etharp_remove_static_entry).
   */
  #ifndef ETHARP_SUPPORT_STATIC_ENTRIES
  #define ETHARP_SUPPORT_STATIC_ENTRIES   0
  #endif
  
  /*
     --------------------------------
     ---------- IP options ----------
     --------------------------------
  */
  /**
   * 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.
   */
  #ifndef IP_FORWARD
  #define IP_FORWARD                      0
  #endif
  
  /**
   * 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).
   */
  #ifndef IP_OPTIONS_ALLOWED
  #define IP_OPTIONS_ALLOWED              1
  #endif
  
  /**
   * 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.
   */
  #ifndef IP_REASSEMBLY
  #define IP_REASSEMBLY                   1
  #endif
  
  /**
   * 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.
   */
  #ifndef IP_FRAG
  #define IP_FRAG                         1
  #endif
  
  /**
   * IP_REASS_MAXAGE: Maximum time (in multiples of IP_TMR_INTERVAL - so seconds, normally)
   * a fragmented IP packet waits for all fragments to arrive. If not all fragments arrived
   * in this time, the whole packet is discarded.
   */
  #ifndef IP_REASS_MAXAGE
  #define IP_REASS_MAXAGE                 3
  #endif
  
  /**
   * 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!
   */
  #ifndef IP_REASS_MAX_PBUFS
  #define IP_REASS_MAX_PBUFS              10
  #endif
  
  /**
   * IP_FRAG_USES_STATIC_BUF==1: Use a static MTU-sized buffer for IP
   * fragmentation. Otherwise pbufs are allocated and reference the original
   * packet data to be fragmented (or with LWIP_NETIF_TX_SINGLE_PBUF==1,
   * new PBUF_RAM pbufs are used for fragments).
   * ATTENTION: IP_FRAG_USES_STATIC_BUF==1 may not be used for DMA-enabled MACs!
   */
  #ifndef IP_FRAG_USES_STATIC_BUF
  #define IP_FRAG_USES_STATIC_BUF         0
  #endif
  
  /**
   * IP_FRAG_MAX_MTU: Assumed max MTU on any interface for IP frag buffer
   * (requires IP_FRAG_USES_STATIC_BUF==1)
   */
  #if IP_FRAG_USES_STATIC_BUF && !defined(IP_FRAG_MAX_MTU)
  #define IP_FRAG_MAX_MTU                 1500
  #endif
  
  /**
   * IP_DEFAULT_TTL: Default value for Time-To-Live used by transport layers.
   */
  #ifndef IP_DEFAULT_TTL
  #define IP_DEFAULT_TTL                  255
  #endif
  
  /**
   * IP_SOF_BROADCAST=1: Use the SOF_BROADCAST field to enable broadcast
   * filter per pcb on udp and raw send operations. To enable broadcast filter
   * on recv operations, you also have to set IP_SOF_BROADCAST_RECV=1.
   */
  #ifndef IP_SOF_BROADCAST
  #define IP_SOF_BROADCAST                0
  #endif
  
  /**
   * IP_SOF_BROADCAST_RECV (requires IP_SOF_BROADCAST=1) enable the broadcast
   * filter on recv operations.
   */
  #ifndef IP_SOF_BROADCAST_RECV
  #define IP_SOF_BROADCAST_RECV           0
  #endif
  
  /**
   * IP_FORWARD_ALLOW_TX_ON_RX_NETIF==1: allow ip_forward() to send packets back
   * out on the netif where it was received. This should only be used for
   * wireless networks.
   * ATTENTION: When this is 1, make sure your netif driver correctly marks incoming
   * link-layer-broadcast/multicast packets as such using the corresponding pbuf flags!
   */
  #ifndef IP_FORWARD_ALLOW_TX_ON_RX_NETIF
  #define IP_FORWARD_ALLOW_TX_ON_RX_NETIF 0
  #endif
  
  /**
   * LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS==1: randomize the local port for the first
   * local TCP/UDP pcb (default==0). This can prevent creating predictable port
   * numbers after booting a device.
   */
  #ifndef LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS
  #define LWIP_RANDOMIZE_INITIAL_LOCAL_PORTS 0
  #endif
  
  /*
     ----------------------------------
     ---------- ICMP options ----------
     ----------------------------------
  */
  /**
   * LWIP_ICMP==1: Enable ICMP module inside the IP stack.
   * Be careful, disable that make your product non-compliant to RFC1122
   */
  #ifndef LWIP_ICMP
  #define LWIP_ICMP                       1
  #endif
  
  /**
   * ICMP_TTL: Default value for Time-To-Live used by ICMP packets.
   */
  #ifndef ICMP_TTL
  #define ICMP_TTL                       (IP_DEFAULT_TTL)
  #endif
  
  /**
   * LWIP_BROADCAST_PING==1: respond to broadcast pings (default is unicast only)
   */
  #ifndef LWIP_BROADCAST_PING
  #define LWIP_BROADCAST_PING             0
  #endif
  
  /**
   * LWIP_MULTICAST_PING==1: respond to multicast pings (default is unicast only)
   */
  #ifndef LWIP_MULTICAST_PING
  #define LWIP_MULTICAST_PING             0
  #endif
  
  /*
     ---------------------------------
     ---------- RAW options ----------
     ---------------------------------
  */
  /**
   * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
   */
  #ifndef LWIP_RAW
  #define LWIP_RAW                        1
  #endif
  
  /**
   * LWIP_RAW==1: Enable application layer to hook into the IP layer itself.
   */
  #ifndef RAW_TTL
  #define RAW_TTL                        (IP_DEFAULT_TTL)
  #endif
  
  /*
     ----------------------------------
     ---------- DHCP options ----------
     ----------------------------------
  */
  /**
   * LWIP_DHCP==1: Enable DHCP module.
   */
  #ifndef LWIP_DHCP
  #define LWIP_DHCP                       0
  #endif
  
  /**
   * DHCP_DOES_ARP_CHECK==1: Do an ARP check on the offered address.
   */
  #ifndef DHCP_DOES_ARP_CHECK
  #define DHCP_DOES_ARP_CHECK             ((LWIP_DHCP) && (LWIP_ARP))
  #endif
  
  /**
   * LWIP_DHCP_BOOTP_FILE==1: Store offered_si_addr and boot_file_name.
   */
  #ifndef LWIP_DHCP_BOOTP_FILE
  #define LWIP_DHCP_BOOTP_FILE            0
  #endif
  
  /*
     ------------------------------------
     ---------- AUTOIP options ----------
     ------------------------------------
  */
  /**
   * LWIP_AUTOIP==1: Enable AUTOIP module.
   */
  #ifndef LWIP_AUTOIP
  #define LWIP_AUTOIP                     0
  #endif
  
  /**
   * LWIP_DHCP_AUTOIP_COOP==1: Allow DHCP and AUTOIP to be both enabled on
   * the same interface at the same time.
   */
  #ifndef LWIP_DHCP_AUTOIP_COOP
  #define LWIP_DHCP_AUTOIP_COOP           0
  #endif
  
  /**
   * LWIP_DHCP_AUTOIP_COOP_TRIES: Set to the number of DHCP DISCOVER probes
   * that should be sent before falling back on AUTOIP. This can be set
   * as low as 1 to get an AutoIP address very quickly, but you should
   * be prepared to handle a changing IP address when DHCP overrides
   * AutoIP.
   */
  #ifndef LWIP_DHCP_AUTOIP_COOP_TRIES
  #define LWIP_DHCP_AUTOIP_COOP_TRIES     9
  #endif
  
  /*
     ----------------------------------
     ---------- SNMP options ----------
     ----------------------------------
  */
  /**
   * LWIP_SNMP==1: Turn on SNMP module. UDP must be available for SNMP
   * transport.
   */
  #ifndef LWIP_SNMP
  #define LWIP_SNMP                       0
  #endif
  
  /**
   * SNMP_CONCURRENT_REQUESTS: Number of concurrent requests the module will
   * allow. At least one request buffer is required.
   * Does not have to be changed unless external MIBs answer request asynchronously
   */
  #ifndef SNMP_CONCURRENT_REQUESTS
  #define SNMP_CONCURRENT_REQUESTS        1
  #endif
  
  /**
   * SNMP_TRAP_DESTINATIONS: Number of trap destinations. At least one trap
   * destination is required
   */
  #ifndef SNMP_TRAP_DESTINATIONS
  #define SNMP_TRAP_DESTINATIONS          1
  #endif
  
  /**
   * SNMP_PRIVATE_MIB:
   * When using a private MIB, you have to create a file 'private_mib.h' that contains
   * a 'struct mib_array_node mib_private' which contains your MIB.
   */
  #ifndef SNMP_PRIVATE_MIB
  #define SNMP_PRIVATE_MIB                0
  #endif
  
  /**
   * Only allow SNMP write actions that are 'safe' (e.g. disabeling netifs is not
   * a safe action and disabled when SNMP_SAFE_REQUESTS = 1).
   * Unsafe requests are disabled by default!
   */
  #ifndef SNMP_SAFE_REQUESTS
  #define SNMP_SAFE_REQUESTS              1
  #endif
  
  /**
   * The maximum length of strings used. This affects the size of
   * MEMP_SNMP_VALUE elements.
   */
  #ifndef SNMP_MAX_OCTET_STRING_LEN
  #define SNMP_MAX_OCTET_STRING_LEN       127
  #endif
  
  /**
   * The maximum depth of the SNMP tree.
   * With private MIBs enabled, this depends on your MIB!
   * This affects the size of MEMP_SNMP_VALUE elements.
   */
  #ifndef SNMP_MAX_TREE_DEPTH
  #define SNMP_MAX_TREE_DEPTH             15
  #endif
  
  /**
   * The size of the MEMP_SNMP_VALUE elements, normally calculated from
   * SNMP_MAX_OCTET_STRING_LEN and SNMP_MAX_TREE_DEPTH.
   */
  #ifndef SNMP_MAX_VALUE_SIZE
  #define SNMP_MAX_VALUE_SIZE             LWIP_MAX((SNMP_MAX_OCTET_STRING_LEN)+1, sizeof(s32_t)*(SNMP_MAX_TREE_DEPTH))
  #endif
  
  /*
     ----------------------------------
     ---------- IGMP options ----------
     ----------------------------------
  */
  /**
   * LWIP_IGMP==1: Turn on IGMP module.
   */
  #ifndef LWIP_IGMP
  #define LWIP_IGMP                       0
  #endif
  
  /*
     ---------------------------------
     ---------- UDP options ----------
     ---------------------------------
  */
  /**
   * LWIP_UDP==1: Turn on UDP.
   */
  #ifndef LWIP_UDP
  #define LWIP_UDP                        1
  #endif
  
  /**
   * LWIP_UDPLITE==1: Turn on UDP-Lite. (Requires LWIP_UDP)
   */
  #ifndef LWIP_UDPLITE
  #define LWIP_UDPLITE                    0
  #endif
  
  /**
   * UDP_TTL: Default Time-To-Live value.
   */
  #ifndef UDP_TTL
  #define UDP_TTL                         (IP_DEFAULT_TTL)
  #endif
  
  /**
   * LWIP_NETBUF_RECVINFO==1: append destination addr and port to every netbuf.
   */
  #ifndef LWIP_NETBUF_RECVINFO
  #define LWIP_NETBUF_RECVINFO            0
  #endif
  
  /*
     ---------------------------------
     ---------- TCP options ----------
     ---------------------------------
  */
  /**
   * LWIP_TCP==1: Turn on TCP.
   */
  #ifndef LWIP_TCP
  #define LWIP_TCP                        1
  #endif
  
  /**
   * TCP_TTL: Default Time-To-Live value.
   */
  #ifndef TCP_TTL
  #define TCP_TTL                         (IP_DEFAULT_TTL)
  #endif
  
  /**
   * TCP_WND: The size of a TCP window.  This must be at least
   * (2 * TCP_MSS) for things to work well
   */
  #ifndef TCP_WND
  #define TCP_WND                         (4 * TCP_MSS)
  #endif
  
  /**
   * 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_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                         536
  #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                     (2 * TCP_MSS)
  #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
  
  /**
   * TCP_SNDLOWAT: TCP writable space (bytes). This must be less than
   * TCP_SND_BUF. It is the amount of space which must be available in the
   * TCP snd_buf for select to return writable (combined with TCP_SNDQUEUELOWAT).
   */
  #ifndef TCP_SNDLOWAT
  #define TCP_SNDLOWAT                    LWIP_MIN(LWIP_MAX(((TCP_SND_BUF)/2), (2 * TCP_MSS) + 1), (TCP_SND_BUF) - 1)
  #endif
  
  /**
   * TCP_SNDQUEUELOWAT: TCP writable bufs (pbuf count). This must be less
   * than TCP_SND_QUEUELEN. If the number of pbufs queued on a pcb drops below
   * this number, select returns writable (combined with TCP_SNDLOWAT).
   */
  #ifndef TCP_SNDQUEUELOWAT
  #define TCP_SNDQUEUELOWAT               LWIP_MAX(((TCP_SND_QUEUELEN)/2), 5)
  #endif
  
  /**
   * TCP_OOSEQ_MAX_BYTES: The maximum number of bytes queued on ooseq per pcb.
   * Default is 0 (no limit). Only valid for TCP_QUEUE_OOSEQ==0.
   */
  #ifndef TCP_OOSEQ_MAX_BYTES
  #define TCP_OOSEQ_MAX_BYTES             0
  #endif
  
  /**
   * TCP_OOSEQ_MAX_PBUFS: The maximum number of pbufs queued on ooseq per pcb.
   * Default is 0 (no limit). Only valid for TCP_QUEUE_OOSEQ==0.
   */
  #ifndef TCP_OOSEQ_MAX_PBUFS
  #define TCP_OOSEQ_MAX_PBUFS             0
  #endif
  
  /**
   * TCP_LISTEN_BACKLOG: Enable the backlog option for tcp listen pcb.
   */
  #ifndef TCP_LISTEN_BACKLOG
  #define TCP_LISTEN_BACKLOG              0
  #endif
  
  /**
   * The maximum allowed backlog for TCP listen netconns.
   * This backlog is used unless another is explicitly specified.
   * 0xff is the maximum (u8_t).
   */
  #ifndef TCP_DEFAULT_LISTEN_BACKLOG
  #define TCP_DEFAULT_LISTEN_BACKLOG      0xff
  #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
  
  /**
   * LWIP_TCP_TIMESTAMPS==1: support the TCP timestamp option.
   */
  #ifndef LWIP_TCP_TIMESTAMPS
  #define LWIP_TCP_TIMESTAMPS             0
  #endif
  
  /**
   * TCP_WND_UPDATE_THRESHOLD: difference in window to trigger an
   * explicit window update
   */
  #ifndef TCP_WND_UPDATE_THRESHOLD
  #define TCP_WND_UPDATE_THRESHOLD   (TCP_WND / 4)
  #endif
  
  /**
   * LWIP_EVENT_API and LWIP_CALLBACK_API: Only one of these should be set to 1.
   *     LWIP_EVENT_API==1: The user defines lwip_tcp_event() to receive all
   *         events (accept, sent, etc) that happen in the system.
   *     LWIP_CALLBACK_API==1: The PCB callback function is called directly
   *         for the event. This is the default.
   */
  #if !defined(LWIP_EVENT_API) && !defined(LWIP_CALLBACK_API)
  #define LWIP_EVENT_API                  0
  #define LWIP_CALLBACK_API               1
  #endif
  
  /*
     ----------------------------------
     ---------- Pbuf options ----------
     ----------------------------------
  */
  /**
   * 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.
   */
  #ifndef PBUF_LINK_HLEN
  #define PBUF_LINK_HLEN                  (14 + ETH_PAD_SIZE)
  #endif
  
  /**
   * PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. The default is
   * designed to accomodate single full size TCP frame in one pbuf, including
   * TCP_MSS, IP header, and link header.
   */
  #ifndef PBUF_POOL_BUFSIZE
  #define PBUF_POOL_BUFSIZE               LWIP_MEM_ALIGN_SIZE(TCP_MSS+40+PBUF_LINK_HLEN)
  #endif
  
  /*
     ------------------------------------------------
     ---------- Network Interfaces options ----------
     ------------------------------------------------
  */
  /**
   * LWIP_NETIF_HOSTNAME==1: use DHCP_OPTION_HOSTNAME with netif's hostname
   * field.
   */
  #ifndef LWIP_NETIF_HOSTNAME
  #define LWIP_NETIF_HOSTNAME             0
  #endif
  
  /**
   * LWIP_NETIF_API==1: Support netif api (in netifapi.c)
   */
  #ifndef LWIP_NETIF_API
  #define LWIP_NETIF_API                  0
  #endif
  
  /**
   * LWIP_NETIF_STATUS_CALLBACK==1: Support a callback function whenever an interface
   * changes its up/down status (i.e., due to DHCP IP acquistion)
   */
  #ifndef LWIP_NETIF_STATUS_CALLBACK
  #define LWIP_NETIF_STATUS_CALLBACK      0
  #endif
  
  /**
   * LWIP_NETIF_LINK_CALLBACK==1: Support a callback function from an interface
   * whenever the link changes (i.e., link down)
   */
  #ifndef LWIP_NETIF_LINK_CALLBACK
  #define LWIP_NETIF_LINK_CALLBACK        0
  #endif
  
  /**
   * LWIP_NETIF_REMOVE_CALLBACK==1: Support a callback function that is called
   * when a netif has been removed
   */
  #ifndef LWIP_NETIF_REMOVE_CALLBACK
  #define LWIP_NETIF_REMOVE_CALLBACK      0
  #endif
  
  /**
   * LWIP_NETIF_HWADDRHINT==1: Cache link-layer-address hints (e.g. table
   * indices) in struct netif. TCP and UDP can make use of this to prevent
   * scanning the ARP table for every sent packet. While this is faster for big
   * ARP tables or many concurrent connections, it might be counterproductive
   * if you have a tiny ARP table or if there never are concurrent connections.
   */
  #ifndef LWIP_NETIF_HWADDRHINT
  #define LWIP_NETIF_HWADDRHINT           0
  #endif
  
  /**
   * LWIP_NETIF_LOOPBACK==1: Support sending packets with a destination IP
   * address equal to the netif IP address, looping them back up the stack.
   */
  #ifndef LWIP_NETIF_LOOPBACK
  #define LWIP_NETIF_LOOPBACK             0
  #endif
  
  /**
   * LWIP_LOOPBACK_MAX_PBUFS: Maximum number of pbufs on queue for loopback
   * sending for each netif (0 = disabled)
   */
  #ifndef LWIP_LOOPBACK_MAX_PBUFS
  #define LWIP_LOOPBACK_MAX_PBUFS         0
  #endif
  
  /**
   * LWIP_NETIF_LOOPBACK_MULTITHREADING: Indicates whether threading is enabled in
   * the system, as netifs must change how they behave depending on this setting
   * for the LWIP_NETIF_LOOPBACK option to work.
   * Setting this is needed to avoid reentering non-reentrant functions like
   * tcp_input().
   *    LWIP_NETIF_LOOPBACK_MULTITHREADING==1: Indicates that the user is using a
   *       multithreaded environment like tcpip.c. In this case, netif->input()
   *       is called directly.
   *    LWIP_NETIF_LOOPBACK_MULTITHREADING==0: Indicates a polling (or NO_SYS) setup.
   *       The packets are put on a list and netif_poll() must be called in
   *       the main application loop.
   */
  #ifndef LWIP_NETIF_LOOPBACK_MULTITHREADING
  #define LWIP_NETIF_LOOPBACK_MULTITHREADING    (!NO_SYS)
  #endif
  
  /**
   * LWIP_NETIF_TX_SINGLE_PBUF: if this is set to 1, lwIP tries to put all data
   * to be sent into one single pbuf. This is for compatibility with DMA-enabled
   * MACs that do not support scatter-gather.
   * Beware that this might involve CPU-memcpy before transmitting that would not
   * be needed without this flag! Use this only if you need to!
   *
   * @todo: TCP and IP-frag do not work with this, yet:
   */
  #ifndef LWIP_NETIF_TX_SINGLE_PBUF
  #define LWIP_NETIF_TX_SINGLE_PBUF             0
  #endif							/* LWIP_NETIF_TX_SINGLE_PBUF */
  
  /*
     ------------------------------------
     ---------- LOOPIF options ----------
     ------------------------------------
  */
  /**
   * LWIP_HAVE_LOOPIF==1: Support loop interface (127.0.0.1) and loopif.c
   */
  #ifndef LWIP_HAVE_LOOPIF
  #define LWIP_HAVE_LOOPIF                0
  #endif
  
  /*
     ------------------------------------
     ---------- SLIPIF options ----------
     ------------------------------------
  */
  /**
   * LWIP_HAVE_SLIPIF==1: Support slip interface and slipif.c
   */
  #ifndef LWIP_HAVE_SLIPIF
  #define LWIP_HAVE_SLIPIF                0
  #endif
  
  /*
     ------------------------------------
     ---------- Thread options ----------
     ------------------------------------
  */
  /**
   * TCPIP_THREAD_NAME: The name assigned to the main tcpip thread.
   */
  #ifndef TCPIP_THREAD_NAME
  #define TCPIP_THREAD_NAME              "tcpip_thread"
  #endif
  
  /**
   * TCPIP_THREAD_STACKSIZE: The stack size used by the main tcpip thread.
   * The stack size value itself is platform-dependent, but is passed to
   * sys_thread_new() when the thread is created.
   */
  #ifndef TCPIP_THREAD_STACKSIZE
  #define TCPIP_THREAD_STACKSIZE          0
  #endif
  
  /**
   * TCPIP_THREAD_PRIO: The priority assigned to the main tcpip thread.
   * The priority value itself is platform-dependent, but is passed to
   * sys_thread_new() when the thread is created.
   */
  #ifndef TCPIP_THREAD_PRIO
  #define TCPIP_THREAD_PRIO               1
  #endif
  
  /**
   * TCPIP_MBOX_SIZE: The mailbox size for the tcpip thread messages
   * The queue size value itself is platform-dependent, but is passed to
   * sys_mbox_new() when tcpip_init is called.
   */
  #ifndef TCPIP_MBOX_SIZE
  #define TCPIP_MBOX_SIZE                 0
  #endif
  
  /**
   * SLIPIF_THREAD_NAME: The name assigned to the slipif_loop thread.
   */
  #ifndef SLIPIF_THREAD_NAME
  #define SLIPIF_THREAD_NAME             "slipif_loop"
  #endif
  
  /**
   * SLIP_THREAD_STACKSIZE: The stack size used by the slipif_loop thread.
   * The stack size value itself is platform-dependent, but is passed to
   * sys_thread_new() when the thread is created.
   */
  #ifndef SLIPIF_THREAD_STACKSIZE
  #define SLIPIF_THREAD_STACKSIZE         0
  #endif
  
  /**
   * SLIPIF_THREAD_PRIO: The priority assigned to the slipif_loop thread.
   * The priority value itself is platform-dependent, but is passed to
   * sys_thread_new() when the thread is created.
   */
  #ifndef SLIPIF_THREAD_PRIO
  #define SLIPIF_THREAD_PRIO              1
  #endif
  
  /**
   * PPP_THREAD_NAME: The name assigned to the pppInputThread.
   */
  #ifndef PPP_THREAD_NAME
  #define PPP_THREAD_NAME                "pppInputThread"
  #endif
  
  /**
   * PPP_THREAD_STACKSIZE: The stack size used by the pppInputThread.
   * The stack size value itself is platform-dependent, but is passed to
   * sys_thread_new() when the thread is created.
   */
  #ifndef PPP_THREAD_STACKSIZE
  #define PPP_THREAD_STACKSIZE            0
  #endif
  
  /**
   * PPP_THREAD_PRIO: The priority assigned to the pppInputThread.
   * The priority value itself is platform-dependent, but is passed to
   * sys_thread_new() when the thread is created.
   */
  #ifndef PPP_THREAD_PRIO
  #define PPP_THREAD_PRIO                 1
  #endif
  
  /**
   * DEFAULT_THREAD_NAME: The name assigned to any other lwIP thread.
   */
  #ifndef DEFAULT_THREAD_NAME
  #define DEFAULT_THREAD_NAME            "lwIP"
  #endif
  
  /**
   * DEFAULT_THREAD_STACKSIZE: The stack size used by any other lwIP thread.
   * The stack size value itself is platform-dependent, but is passed to
   * sys_thread_new() when the thread is created.
   */
  #ifndef DEFAULT_THREAD_STACKSIZE
  #define DEFAULT_THREAD_STACKSIZE        0
  #endif
  
  /**
   * DEFAULT_THREAD_PRIO: The priority assigned to any other lwIP thread.
   * The priority value itself is platform-dependent, but is passed to
   * sys_thread_new() when the thread is created.
   */
  #ifndef DEFAULT_THREAD_PRIO
  #define DEFAULT_THREAD_PRIO             1
  #endif
  
  /**
   * DEFAULT_RAW_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
   * NETCONN_RAW. The queue size value itself is platform-dependent, but is passed
   * to sys_mbox_new() when the recvmbox is created.
   */
  #ifndef DEFAULT_RAW_RECVMBOX_SIZE
  #define DEFAULT_RAW_RECVMBOX_SIZE       0
  #endif
  
  /**
   * DEFAULT_UDP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
   * NETCONN_UDP. The queue size value itself is platform-dependent, but is passed
   * to sys_mbox_new() when the recvmbox is created.
   */
  #ifndef DEFAULT_UDP_RECVMBOX_SIZE
  #define DEFAULT_UDP_RECVMBOX_SIZE       0
  #endif
  
  /**
   * DEFAULT_TCP_RECVMBOX_SIZE: The mailbox size for the incoming packets on a
   * NETCONN_TCP. The queue size value itself is platform-dependent, but is passed
   * to sys_mbox_new() when the recvmbox is created.
   */
  #ifndef DEFAULT_TCP_RECVMBOX_SIZE
  #define DEFAULT_TCP_RECVMBOX_SIZE       0
  #endif
  
  /**
   * DEFAULT_ACCEPTMBOX_SIZE: The mailbox size for the incoming connections.
   * The queue size value itself is platform-dependent, but is passed to
   * sys_mbox_new() when the acceptmbox is created.
   */
  #ifndef DEFAULT_ACCEPTMBOX_SIZE
  #define DEFAULT_ACCEPTMBOX_SIZE         0
  #endif
  
  /*
     ----------------------------------------------
     ---------- Sequential layer options ----------
     ----------------------------------------------
  */
  /**
   * LWIP_TCPIP_CORE_LOCKING: (EXPERIMENTAL!)
   * Don't use it if you're not an active lwIP project member
   */
  #ifndef LWIP_TCPIP_CORE_LOCKING
  #define LWIP_TCPIP_CORE_LOCKING         0
  #endif
  
  /**
   * LWIP_TCPIP_CORE_LOCKING_INPUT: (EXPERIMENTAL!)
   * Don't use it if you're not an active lwIP project member
   */
  #ifndef LWIP_TCPIP_CORE_LOCKING_INPUT
  #define LWIP_TCPIP_CORE_LOCKING_INPUT   0
  #endif
  
  /**
   * LWIP_NETCONN==1: Enable Netconn API (require to use api_lib.c)
   */
  #ifndef LWIP_NETCONN
  #define LWIP_NETCONN                    1
  #endif
  
  /** 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
  
  /*
     ------------------------------------
     ---------- Socket options ----------
     ------------------------------------
  */
  /**
   * LWIP_SOCKET==1: Enable Socket API (require to use sockets.c)
   */
  #ifndef LWIP_SOCKET
  #define LWIP_SOCKET                     1
  #endif
  
  /**
   * LWIP_SELECT==1: Enable lwip_select API
   */
  #ifndef LWIP_SELECT
  #define LWIP_SELECT                     1
  #endif
  
  /**
   * LWIP_COMPAT_SOCKETS==1: Enable BSD-style sockets functions names.
   * (only used if you use sockets.c)
   */
  #ifndef LWIP_COMPAT_SOCKETS
  #define LWIP_COMPAT_SOCKETS             1
  #endif
  
  /**
   * LWIP_POSIX_SOCKETS_IO_NAMES==1: Enable POSIX-style sockets functions names.
   * Disable this option if you use a POSIX operating system that uses the same
   * names (read, write & close). (only used if you use sockets.c)
   */
  #ifndef LWIP_POSIX_SOCKETS_IO_NAMES
  #define LWIP_POSIX_SOCKETS_IO_NAMES     1
  #endif
  
  /**
   * LWIP_SOCKET_OFFSET==n: Increases the file descriptor number created by LwIP with n.
   * This can be useful when there are multiple APIs which create file descriptors.
   * When they all start with a different offset and you won't make them overlap you can
   * re implement read/write/close/ioctl/fnctl to send the requested action to the right
   * library (sharing select will need more work though).
   */
  #ifndef LWIP_SOCKET_OFFSET
  #define LWIP_SOCKET_OFFSET              0
  #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)
   */
  #ifndef LWIP_TCP_KEEPALIVE
  #define LWIP_TCP_KEEPALIVE              0
  #endif
  
  /**
   * LWIP_SO_SNDTIMEO==1: Enable send timeout for sockets/netconns and
   * SO_SNDTIMEO processing.
   */
  #ifndef LWIP_SO_SNDTIMEO
  #define LWIP_SO_SNDTIMEO                0
  #endif
  
  /**
   * LWIP_SO_RCVTIMEO==1: Enable receive timeout for sockets/netconns and
   * SO_RCVTIMEO processing.
   */
  #ifndef LWIP_SO_RCVTIMEO
  #define LWIP_SO_RCVTIMEO                0
  #endif
  
  /**
   * LWIP_SO_RCVBUF==1: Enable SO_RCVBUF processing.
   */
  #ifndef LWIP_SO_RCVBUF
  #define LWIP_SO_RCVBUF                  0
  #endif
  
  /**
   * If LWIP_SO_RCVBUF is used, this is the default value for recv_bufsize.
   */
  #ifndef RECV_BUFSIZE_DEFAULT
  #define RECV_BUFSIZE_DEFAULT            INT_MAX
  #endif
  
  /**
   * SO_REUSE==1: Enable SO_REUSEADDR option.
   */
  #ifndef SO_REUSE
  #define SO_REUSE                        0
  #endif
  
  /**
   * SO_REUSE_RXTOALL==1: Pass a copy of incoming broadcast/multicast packets
   * to all local matches if SO_REUSEADDR is turned on.
   * WARNING: Adds a memcpy for every packet if passing to more than one pcb!
   */
  #ifndef SO_REUSE_RXTOALL
  #define SO_REUSE_RXTOALL                0
  #endif
  
  /*
     ----------------------------------------
     ---------- Statistics options ----------
     ----------------------------------------
  */
  /**
   * LWIP_STATS==1: Enable statistics collection in lwip_stats.
   */
  #ifndef LWIP_STATS
  #define LWIP_STATS                      0
  #endif
  
  #if LWIP_STATS
  
  /**
   * LWIP_STATS_DISPLAY==1: Compile in the statistics output functions.
   */
  #ifndef LWIP_STATS_DISPLAY
  #define LWIP_STATS_DISPLAY              0
  #endif
  
  /**
   * LINK_STATS==1: Enable link stats.
   */
  #ifndef LINK_STATS
  #define LINK_STATS                      1
  #endif
  
  /**
   * ETHARP_STATS==1: Enable etharp stats.
   */
  #ifndef ETHARP_STATS
  #define ETHARP_STATS                    (LWIP_ARP)
  #endif
  
  /**
   * IP_STATS==1: Enable IP stats.
   */
  #ifndef IP_STATS
  #define IP_STATS                        1
  #endif
  
  /**
   * IPFRAG_STATS==1: Enable IP fragmentation stats. Default is
   * on if using either frag or reass.
   */
  #ifndef IPFRAG_STATS
  #define IPFRAG_STATS                    (IP_REASSEMBLY || IP_FRAG)
  #endif
  
  /**
   * ICMP_STATS==1: Enable ICMP stats.
   */
  #ifndef ICMP_STATS
  #define ICMP_STATS                      1
  #endif
  
  /**
   * IGMP_STATS==1: Enable IGMP stats.
   */
  #ifndef IGMP_STATS
  #define IGMP_STATS                      (LWIP_IGMP)
  #endif
  
  /**
   * UDP_STATS==1: Enable UDP stats. Default is on if
   * UDP enabled, otherwise off.
   */
  #ifndef UDP_STATS
  #define UDP_STATS                       (LWIP_UDP)
  #endif
  
  /**
   * TCP_STATS==1: Enable TCP stats. Default is on if TCP
   * enabled, otherwise off.
   */
  #ifndef TCP_STATS
  #define TCP_STATS                       (LWIP_TCP)
  #endif
  
  /**
   * MEM_STATS==1: Enable mem.c stats.
   */
  #ifndef MEM_STATS
  #define MEM_STATS                       ((MEM_LIBC_MALLOC == 0) && (MEM_USE_POOLS == 0))
  #endif
  
  /**
   * MEMP_STATS==1: Enable memp.c pool stats.
   */
  #ifndef MEMP_STATS
  #define MEMP_STATS                      (MEMP_MEM_MALLOC == 0)
  #endif
  
  /**
   * SYS_STATS==1: Enable system stats (sem and mbox counts, etc).
   */
  #ifndef SYS_STATS
  #define SYS_STATS                       (NO_SYS == 0)
  #endif
  
  #else
  
  #define LINK_STATS                      0
  #define IP_STATS                        0
  #define IPFRAG_STATS                    0
  #define ICMP_STATS                      0
  #define IGMP_STATS                      0
  #define UDP_STATS                       0
  #define TCP_STATS                       0
  #define MEM_STATS                       0
  #define MEMP_STATS                      0
  #define SYS_STATS                       0
  #define LWIP_STATS_DISPLAY              0
  
  #endif							/* LWIP_STATS */
  
  /*
     ---------------------------------
     ---------- PPP options ----------
     ---------------------------------
  */
  /**
   * PPP_SUPPORT==1: Enable PPP.
   */
  #ifndef PPP_SUPPORT
  #define PPP_SUPPORT                     0
  #endif
  
  /**
   * PPPOE_SUPPORT==1: Enable PPP Over Ethernet
   */
  #ifndef PPPOE_SUPPORT
  #define PPPOE_SUPPORT                   0
  #endif
  
  /**
   * PPPOS_SUPPORT==1: Enable PPP Over Serial
   */
  #ifndef PPPOS_SUPPORT
  #define PPPOS_SUPPORT                   PPP_SUPPORT
  #endif
  
  #if PPP_SUPPORT
  
  /**
   * NUM_PPP: Max PPP sessions.
   */
  #ifndef NUM_PPP
  #define NUM_PPP                         1
  #endif
  
  /**
   * PAP_SUPPORT==1: Support PAP.
   */
  #ifndef PAP_SUPPORT
  #define PAP_SUPPORT                     0
  #endif
  
  /**
   * CHAP_SUPPORT==1: Support CHAP.
   */
  #ifndef CHAP_SUPPORT
  #define CHAP_SUPPORT                    0
  #endif
  
  /**
   * MSCHAP_SUPPORT==1: Support MSCHAP. CURRENTLY NOT SUPPORTED! DO NOT SET!
   */
  #ifndef MSCHAP_SUPPORT
  #define MSCHAP_SUPPORT                  0
  #endif
  
  /**
   * CBCP_SUPPORT==1: Support CBCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
   */
  #ifndef CBCP_SUPPORT
  #define CBCP_SUPPORT                    0
  #endif
  
  /**
   * CCP_SUPPORT==1: Support CCP. CURRENTLY NOT SUPPORTED! DO NOT SET!
   */
  #ifndef CCP_SUPPORT
  #define CCP_SUPPORT                     0
  #endif
  
  /**
   * VJ_SUPPORT==1: Support VJ header compression.
   */
  #ifndef VJ_SUPPORT
  #define VJ_SUPPORT                      0
  #endif
  
  /**
   * MD5_SUPPORT==1: Support MD5 (see also CHAP).
   */
  #ifndef MD5_SUPPORT
  #define MD5_SUPPORT                     0
  #endif
  
  /*
   * Timeouts
   */
  #ifndef FSM_DEFTIMEOUT
  #define FSM_DEFTIMEOUT                  6	/* Timeout time in seconds */
  #endif
  
  #ifndef FSM_DEFMAXTERMREQS
  #define FSM_DEFMAXTERMREQS              2	/* Maximum Terminate-Request transmissions */
  #endif
  
  #ifndef FSM_DEFMAXCONFREQS
  #define FSM_DEFMAXCONFREQS              10	/* Maximum Configure-Request transmissions */
  #endif
  
  #ifndef FSM_DEFMAXNAKLOOPS
  #define FSM_DEFMAXNAKLOOPS              5	/* Maximum number of nak loops */
  #endif
  
  #ifndef UPAP_DEFTIMEOUT
  #define UPAP_DEFTIMEOUT                 6	/* Timeout (seconds) for retransmitting req */
  #endif
  
  #ifndef UPAP_DEFREQTIME
  #define UPAP_DEFREQTIME                 30	/* Time to wait for auth-req from peer */
  #endif
  
  #ifndef CHAP_DEFTIMEOUT
  #define CHAP_DEFTIMEOUT                 6	/* Timeout time in seconds */
  #endif
  
  #ifndef CHAP_DEFTRANSMITS
  #define CHAP_DEFTRANSMITS               10	/* max # times to send challenge */
  #endif
  
  /* Interval in seconds between keepalive echo requests, 0 to disable. */
  #ifndef LCP_ECHOINTERVAL
  #define LCP_ECHOINTERVAL                0
  #endif
  
  /* Number of unanswered echo requests before failure. */
  #ifndef LCP_MAXECHOFAILS
  #define LCP_MAXECHOFAILS                3
  #endif
  
  /* Max Xmit idle time (in jiffies) before resend flag char. */
  #ifndef PPP_MAXIDLEFLAG
  #define PPP_MAXIDLEFLAG                 100
  #endif
  
  /*
   * Packet sizes
   *
   * Note - lcp shouldn't be allowed to negotiate stuff outside these
   *    limits.  See lcp.h in the pppd directory.
   * (XXX - these constants should simply be shared by lcp.c instead
   *    of living in lcp.h)
   */
  #define PPP_MTU                         1500	/* Default MTU (size of Info field) */
  #ifndef PPP_MAXMTU
  /* #define PPP_MAXMTU  65535 - (PPP_HDRLEN + PPP_FCSLEN) */
  #define PPP_MAXMTU                      1500	/* Largest MTU we allow */
  #endif
  #define PPP_MINMTU                      64
  #define PPP_MRU                         1500	/* default MRU = max length of info field */
  #define PPP_MAXMRU                      1500	/* Largest MRU we allow */
  #ifndef PPP_DEFMRU
  #define PPP_DEFMRU                      296	/* Try for this */
  #endif
  #define PPP_MINMRU                      128	/* No MRUs below this */
  
  #ifndef MAXNAMELEN
  #define MAXNAMELEN                      256	/* max length of hostname or name for auth */
  #endif
  #ifndef MAXSECRETLEN
  #define MAXSECRETLEN                    256	/* max length of password or secret */
  #endif
  
  #endif							/* PPP_SUPPORT */
  
  /*
     --------------------------------------
     ---------- Checksum options ----------
     --------------------------------------
  */
  /**
   * CHECKSUM_GEN_IP==1: Generate checksums in software for outgoing IP packets.
   */
  #ifndef CHECKSUM_GEN_IP
  #define CHECKSUM_GEN_IP                 1
  #endif
  
  /**
   * CHECKSUM_GEN_UDP==1: Generate checksums in software for outgoing UDP packets.
   */
  #ifndef CHECKSUM_GEN_UDP
  #define CHECKSUM_GEN_UDP                1
  #endif
  
  /**
   * CHECKSUM_GEN_TCP==1: Generate checksums in software for outgoing TCP packets.
   */
  #ifndef CHECKSUM_GEN_TCP
  #define CHECKSUM_GEN_TCP                1
  #endif
  
  /**
   * CHECKSUM_GEN_ICMP==1: Generate checksums in software for outgoing ICMP packets.
   */
  #ifndef CHECKSUM_GEN_ICMP
  #define CHECKSUM_GEN_ICMP               1
  #endif
  
  /**
   * CHECKSUM_CHECK_IP==1: Check checksums in software for incoming IP packets.
   */
  #ifndef CHECKSUM_CHECK_IP
  #define CHECKSUM_CHECK_IP               1
  #endif
  
  /**
   * CHECKSUM_CHECK_UDP==1: Check checksums in software for incoming UDP packets.
   */
  #ifndef CHECKSUM_CHECK_UDP
  #define CHECKSUM_CHECK_UDP              1
  #endif
  
  /**
   * CHECKSUM_CHECK_TCP==1: Check checksums in software for incoming TCP packets.
   */
  #ifndef CHECKSUM_CHECK_TCP
  #define CHECKSUM_CHECK_TCP              1
  #endif
  
  /**
   * LWIP_CHECKSUM_ON_COPY==1: Calculate checksum when copying data from
   * application buffers to pbufs.
   */
  #ifndef LWIP_CHECKSUM_ON_COPY
  #define LWIP_CHECKSUM_ON_COPY           0
  #endif
  
  /*
     ---------------------------------------
     ---------- Hook options ---------------
     ---------------------------------------
  */
  
  /* Hooks are undefined by default, define them to a function if you need them. */
  
  /**
   * LWIP_HOOK_IP4_INPUT(pbuf, input_netif):
   * - called from ip_input() (IPv4)
   * - pbuf: received struct pbuf passed to ip_input()
   * - input_netif: struct netif on which the packet has been received
   * Return values:
   * - 0: Hook has not consumed the packet, packet is processed as normal
   * - != 0: Hook has consumed the packet.
   * If the hook consumed the packet, 'pbuf' is in the responsibility of the hook
   * (i.e. free it when done).
   */
  
  /**
   * LWIP_HOOK_IP4_ROUTE(dest):
   * - called from ip_route() (IPv4)
   * - dest: destination IPv4 address
   * Returns the destination netif or NULL if no destination netif is found. In
   * that case, ip_route() continues as normal.
   */
  
  /*
     ---------------------------------------
     ---------- Debugging options ----------
     ---------------------------------------
  */
  /**
   * LWIP_DBG_MIN_LEVEL: After masking, the value of the debug is
   * compared against this value. If it is smaller, then debugging
   * messages are written.
   */
  #ifndef LWIP_DBG_MIN_LEVEL
  #define LWIP_DBG_MIN_LEVEL              LWIP_DBG_LEVEL_ALL
  #endif
  
  /**
   * LWIP_DBG_TYPES_ON: A mask that can be used to globally enable/disable
   * debug messages of certain types.
   */
  #ifndef LWIP_DBG_TYPES_ON
  #define LWIP_DBG_TYPES_ON               LWIP_DBG_ON
  #endif
  
  /**
   * ETHARP_DEBUG: Enable debugging in etharp.c.
   */
  #ifndef ETHARP_DEBUG
  #define ETHARP_DEBUG                    LWIP_DBG_OFF
  #endif
  
  /**
   * NETIF_DEBUG: Enable debugging in netif.c.
   */
  #ifndef NETIF_DEBUG
  #define NETIF_DEBUG                     LWIP_DBG_OFF
  #endif
  
  /**
   * PBUF_DEBUG: Enable debugging in pbuf.c.
   */
  #ifndef PBUF_DEBUG
  #define PBUF_DEBUG                      LWIP_DBG_OFF
  #endif
  
  /**
   * API_LIB_DEBUG: Enable debugging in api_lib.c.
   */
  #ifndef API_LIB_DEBUG
  #define API_LIB_DEBUG                   LWIP_DBG_OFF
  #endif
  
  /**
   * API_MSG_DEBUG: Enable debugging in api_msg.c.
   */
  #ifndef API_MSG_DEBUG
  #define API_MSG_DEBUG                   LWIP_DBG_OFF
  #endif
  
  /**
   * SOCKETS_DEBUG: Enable debugging in sockets.c.
   */
  #ifndef SOCKETS_DEBUG
  #define SOCKETS_DEBUG                   LWIP_DBG_OFF
  #endif
  
  /**
   * ICMP_DEBUG: Enable debugging in icmp.c.
   */
  #ifndef ICMP_DEBUG
  #define ICMP_DEBUG                      LWIP_DBG_OFF
  #endif
  
  /**
   * IGMP_DEBUG: Enable debugging in igmp.c.
   */
  #ifndef IGMP_DEBUG
  #define IGMP_DEBUG                      LWIP_DBG_OFF
  #endif
  
  /**
   * INET_DEBUG: Enable debugging in inet.c.
   */
  #ifndef INET_DEBUG
  #define INET_DEBUG                      LWIP_DBG_OFF
  #endif
  
  /**
   * IP_DEBUG: Enable debugging for IP.
   */
  #ifndef IP_DEBUG
  #define IP_DEBUG                        LWIP_DBG_OFF
  #endif
  
  /**
   * IP_REASS_DEBUG: Enable debugging in ip_frag.c for both frag & reass.
   */
  #ifndef IP_REASS_DEBUG
  #define IP_REASS_DEBUG                  LWIP_DBG_OFF
  #endif
  
  /**
   * RAW_DEBUG: Enable debugging in raw.c.
   */
  #ifndef RAW_DEBUG
  #define RAW_DEBUG                       LWIP_DBG_OFF
  #endif
  
  /**
   * MEM_DEBUG: Enable debugging in mem.c.
   */
  #ifndef MEM_DEBUG
  #define MEM_DEBUG                       LWIP_DBG_OFF
  #endif
  
  /**
   * MEMP_DEBUG: Enable debugging in memp.c.
   */
  #ifndef MEMP_DEBUG
  #define MEMP_DEBUG                      LWIP_DBG_OFF
  #endif
  
  /**
   * SYS_DEBUG: Enable debugging in sys.c.
   */
  #ifndef SYS_DEBUG
  #define SYS_DEBUG                       LWIP_DBG_OFF
  #endif
  
  /**
   * TIMERS_DEBUG: Enable debugging in timers.c.
   */
  #ifndef TIMERS_DEBUG
  #define TIMERS_DEBUG                    LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_DEBUG: Enable debugging for TCP.
   */
  #ifndef TCP_DEBUG
  #define TCP_DEBUG                       LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_INPUT_DEBUG: Enable debugging in tcp_in.c for incoming debug.
   */
  #ifndef TCP_INPUT_DEBUG
  #define TCP_INPUT_DEBUG                 LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_FR_DEBUG: Enable debugging in tcp_in.c for fast retransmit.
   */
  #ifndef TCP_FR_DEBUG
  #define TCP_FR_DEBUG                    LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_RTO_DEBUG: Enable debugging in TCP for retransmit
   * timeout.
   */
  #ifndef TCP_RTO_DEBUG
  #define TCP_RTO_DEBUG                   LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_CWND_DEBUG: Enable debugging for TCP congestion window.
   */
  #ifndef TCP_CWND_DEBUG
  #define TCP_CWND_DEBUG                  LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_WND_DEBUG: Enable debugging in tcp_in.c for window updating.
   */
  #ifndef TCP_WND_DEBUG
  #define TCP_WND_DEBUG                   LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_OUTPUT_DEBUG: Enable debugging in tcp_out.c output functions.
   */
  #ifndef TCP_OUTPUT_DEBUG
  #define TCP_OUTPUT_DEBUG                LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_RST_DEBUG: Enable debugging for TCP with the RST message.
   */
  #ifndef TCP_RST_DEBUG
  #define TCP_RST_DEBUG                   LWIP_DBG_OFF
  #endif
  
  /**
   * TCP_QLEN_DEBUG: Enable debugging for TCP queue lengths.
   */
  #ifndef TCP_QLEN_DEBUG
  #define TCP_QLEN_DEBUG                  LWIP_DBG_OFF
  #endif
  
  /**
   * UDP_DEBUG: Enable debugging in UDP.
   */
  #ifndef UDP_DEBUG
  #define UDP_DEBUG                       LWIP_DBG_OFF
  #endif
  
  /**
   * TCPIP_DEBUG: Enable debugging in tcpip.c.
   */
  #ifndef TCPIP_DEBUG
  #define TCPIP_DEBUG                     LWIP_DBG_OFF
  #endif
  
  /**
   * PPP_DEBUG: Enable debugging for PPP.
   */
  #ifndef PPP_DEBUG
  #define PPP_DEBUG                       LWIP_DBG_OFF
  #endif
  
  /**
   * SLIP_DEBUG: Enable debugging in slipif.c.
   */
  #ifndef SLIP_DEBUG
  #define SLIP_DEBUG                      LWIP_DBG_OFF
  #endif
  
  /**
   * DHCP_DEBUG: Enable debugging in dhcp.c.
   */
  #ifndef DHCP_DEBUG
  #define DHCP_DEBUG                      LWIP_DBG_OFF
  #endif
  
  /**
   * AUTOIP_DEBUG: Enable debugging in autoip.c.
   */
  #ifndef AUTOIP_DEBUG
  #define AUTOIP_DEBUG                    LWIP_DBG_OFF
  #endif
  
  /**
   * SNMP_MSG_DEBUG: Enable debugging for SNMP messages.
   */
  #ifndef SNMP_MSG_DEBUG
  #define SNMP_MSG_DEBUG                  LWIP_DBG_OFF
  #endif
  
  /**
   * SNMP_MIB_DEBUG: Enable debugging for SNMP MIBs.
   */
  #ifndef SNMP_MIB_DEBUG
  #define SNMP_MIB_DEBUG                  LWIP_DBG_OFF
  #endif
  
  /**
   * DNS_DEBUG: Enable debugging for DNS.
   */
  #ifndef DNS_DEBUG
  #define DNS_DEBUG                       LWIP_DBG_OFF
  #endif
  
  #endif							/* __LWIP_OPT_H__ */
  