text: /*
   * FreeRTOS Kernel V10.0.1
   * Copyright (C) 2017 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy of
   * this software and associated documentation files (the "Software"), to deal in
   * the Software without restriction, including without limitation the rights to
   * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
   * the Software, and to permit persons to whom the Software is furnished to do so,
   * subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
   * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
   * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
   * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
   *
   * http://www.FreeRTOS.org
   * http://aws.amazon.com/freertos
   *
   * 1 tab == 4 spaces!
   */
  
  
  /*****************************************************************************
   *
   * See the following URL for configuration information.
   * http://www.freertos.org/FreeRTOS-Plus/FreeRTOS_Plus_TCP/TCP_IP_Configuration.html
   *
   *****************************************************************************/
  
  #ifndef FREERTOS_IP_CONFIG_H
  #define FREERTOS_IP_CONFIG_H
  
  /* Prototype for the function used to print out.  In this case it prints to the
  console before the network is connected then a UDP port after the network has
  connected. */
  extern void vLoggingPrintf( const char *pcFormatString, ... );
  
  /* Set to 1 to print out debug messages.  If ipconfigHAS_DEBUG_PRINTF is set to
  1 then FreeRTOS_debug_printf should be defined to the function used to print
  out the debugging messages. */
  #define ipconfigHAS_DEBUG_PRINTF	0
  #if( ipconfigHAS_DEBUG_PRINTF == 1 )
  	#define FreeRTOS_debug_printf(X)	vLoggingPrintf X
  #endif
  
  /* Set to 1 to print out non debugging messages, for example the output of the
  FreeRTOS_netstat() command, and ping replies.  If ipconfigHAS_PRINTF is set to 1
  then FreeRTOS_printf should be set to the function used to print out the
  messages. */
  #define ipconfigHAS_PRINTF			1
  #if( ipconfigHAS_PRINTF == 1 )
  	#define FreeRTOS_printf(X)			vLoggingPrintf X
  #endif
  
  /* Define the byte order of the target MCU (the MCU FreeRTOS+TCP is executing
  on).  Valid options are pdFREERTOS_BIG_ENDIAN and pdFREERTOS_LITTLE_ENDIAN. */
  #define ipconfigBYTE_ORDER pdFREERTOS_LITTLE_ENDIAN
  
  /* If the network card/driver includes checksum offloading (IP/TCP/UDP checksums)
  then set ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM to 1 to prevent the software
  stack repeating the checksum calculations. */
  #define ipconfigDRIVER_INCLUDED_RX_IP_CHECKSUM   1
  
  /* Several API's will block until the result is known, or the action has been
  performed, for example FreeRTOS_send() and FreeRTOS_recv().  The timeouts can be
  set per socket, using setsockopt().  If not set, the times below will be
  used as defaults. */
  #define ipconfigSOCK_DEFAULT_RECEIVE_BLOCK_TIME	( 5000 )
  #define	ipconfigSOCK_DEFAULT_SEND_BLOCK_TIME	( 5000 )
  
  /* Include support for LLMNR: Link-local Multicast Name Resolution
  (non-Microsoft) */
  #define ipconfigUSE_LLMNR					( 1 )
  
  /* Include support for NBNS: NetBIOS Name Service (Microsoft) */
  #define ipconfigUSE_NBNS					( 1 )
  
  /* Include support for DNS caching.  For TCP, having a small DNS cache is very
  useful.  When a cache is present, ipconfigDNS_REQUEST_ATTEMPTS can be kept low
  and also DNS may use small timeouts.  If a DNS reply comes in after the DNS
  socket has been destroyed, the result will be stored into the cache.  The next
  call to FreeRTOS_gethostbyname() will return immediately, without even creating
  a socket. */
  #define ipconfigUSE_DNS_CACHE				( 1 )
  #define ipconfigDNS_CACHE_NAME_LENGTH		( 16 )
  #define ipconfigDNS_CACHE_ENTRIES			( 4 )
  #define ipconfigDNS_REQUEST_ATTEMPTS		( 2 )
  
  /* The IP stack executes it its own task (although any application task can make
  use of its services through the published sockets API). ipconfigUDP_TASK_PRIORITY
  sets the priority of the task that executes the IP stack.  The priority is a
  standard FreeRTOS task priority so can take any value from 0 (the lowest
  priority) to (configMAX_PRIORITIES - 1) (the highest priority).
  configMAX_PRIORITIES is a standard FreeRTOS configuration parameter defined in
  FreeRTOSConfig.h, not FreeRTOSIPConfig.h. Consideration needs to be given as to
  the priority assigned to the task executing the IP stack relative to the
  priority assigned to tasks that use the IP stack. */
  #define ipconfigIP_TASK_PRIORITY			( configMAX_PRIORITIES - 2 )
  
  /* The size, in words (not bytes), of the stack allocated to the FreeRTOS+TCP
  task.  This setting is less important when the FreeRTOS Win32 simulator is used
  as the Win32 simulator only stores a fixed amount of information on the task
  stack.  FreeRTOS includes optional stack overflow detection, see:
  http://www.freertos.org/Stacks-and-stack-overflow-checking.html */
  #define ipconfigIP_TASK_STACK_SIZE_WORDS	( configMINIMAL_STACK_SIZE * 5 )
  
  /* ipconfigRAND32() is called by the IP stack to generate random numbers for
  things such as a DHCP transaction number or initial sequence number.  Random
  number generation is performed via this macro to allow applications to use their
  own random number generation method.  For example, it might be possible to
  generate a random number by sampling noise on an analogue input. */
  extern UBaseType_t uxRand();
  #define ipconfigRAND32()	uxRand()
  
  /* If ipconfigUSE_NETWORK_EVENT_HOOK is set to 1 then FreeRTOS+TCP will call the
  network event hook at the appropriate times.  If ipconfigUSE_NETWORK_EVENT_HOOK
  is not set to 1 then the network event hook will never be called.  See
  http://www.FreeRTOS.org/FreeRTOS-Plus/FreeRTOS_Plus_UDP/API/vApplicationIPNetworkEventHook.shtml
  */
  #define ipconfigUSE_NETWORK_EVENT_HOOK 1
  
  /* Sockets have a send block time attribute.  If FreeRTOS_sendto() is called but
  a network buffer cannot be obtained then the calling task is held in the Blocked
  state (so other tasks can continue to executed) until either a network buffer
  becomes available or the send block time expires.  If the send block time expires
  then the send operation is aborted.  The maximum allowable send block time is
  capped to the value set by ipconfigMAX_SEND_BLOCK_TIME_TICKS.  Capping the
  maximum allowable send block time prevents prevents a deadlock occurring when
  all the network buffers are in use and the tasks that process (and subsequently
  free) the network buffers are themselves blocked waiting for a network buffer.
  ipconfigMAX_SEND_BLOCK_TIME_TICKS is specified in RTOS ticks.  A time in
  milliseconds can be converted to a time in ticks by dividing the time in
  milliseconds by portTICK_PERIOD_MS. */
  #define ipconfigUDP_MAX_SEND_BLOCK_TIME_TICKS ( 5000 / portTICK_PERIOD_MS )
  
  /* If ipconfigUSE_DHCP is 1 then FreeRTOS+TCP will attempt to retrieve an IP
  address, netmask, DNS server address and gateway address from a DHCP server.  If
  ipconfigUSE_DHCP is 0 then FreeRTOS+TCP will use a static IP address.  The
  stack will revert to using the static IP address even when ipconfigUSE_DHCP is
  set to 1 if a valid configuration cannot be obtained from a DHCP server for any
  reason.  The static configuration used is that passed into the stack by the
  FreeRTOS_IPInit() function call. */
  #define ipconfigUSE_DHCP	1
  
  /* When ipconfigUSE_DHCP is set to 1, DHCP requests will be sent out at
  increasing time intervals until either a reply is received from a DHCP server
  and accepted, or the interval between transmissions reaches
  ipconfigMAXIMUM_DISCOVER_TX_PERIOD.  The IP stack will revert to using the
  static IP address passed as a parameter to FreeRTOS_IPInit() if the
  re-transmission time interval reaches ipconfigMAXIMUM_DISCOVER_TX_PERIOD without
  a DHCP reply being received. */
  #define ipconfigMAXIMUM_DISCOVER_TX_PERIOD		( 120000 / portTICK_PERIOD_MS )
  
  /* The ARP cache is a table that maps IP addresses to MAC addresses.  The IP
  stack can only send a UDP message to a remove IP address if it knowns the MAC
  address associated with the IP address, or the MAC address of the router used to
  contact the remote IP address.  When a UDP message is received from a remote IP
  address the MAC address and IP address are added to the ARP cache.  When a UDP
  message is sent to a remote IP address that does not already appear in the ARP
  cache then the UDP message is replaced by a ARP message that solicits the
  required MAC address information.  ipconfigARP_CACHE_ENTRIES defines the maximum
  number of entries that can exist in the ARP table at any one time. */
  #define ipconfigARP_CACHE_ENTRIES		6
  
  /* ARP requests that do not result in an ARP response will be re-transmitted a
  maximum of ipconfigMAX_ARP_RETRANSMISSIONS times before the ARP request is
  aborted. */
  #define ipconfigMAX_ARP_RETRANSMISSIONS ( 5 )
  
  /* ipconfigMAX_ARP_AGE defines the maximum time between an entry in the ARP
  table being created or refreshed and the entry being removed because it is stale.
  New ARP requests are sent for ARP cache entries that are nearing their maximum
  age.  ipconfigMAX_ARP_AGE is specified in tens of seconds, so a value of 150 is
  equal to 1500 seconds (or 25 minutes). */
  #define ipconfigMAX_ARP_AGE			150
  
  /* Implementing FreeRTOS_inet_addr() necessitates the use of string handling
  routines, which are relatively large.  To save code space the full
  FreeRTOS_inet_addr() implementation is made optional, and a smaller and faster
  alternative called FreeRTOS_inet_addr_quick() is provided.  FreeRTOS_inet_addr()
  takes an IP in decimal dot format (for example, "192.168.0.1") as its parameter.
  FreeRTOS_inet_addr_quick() takes an IP address as four separate numerical octets
  (for example, 192, 168, 0, 1) as its parameters.  If
  ipconfigINCLUDE_FULL_INET_ADDR is set to 1 then both FreeRTOS_inet_addr() and
  FreeRTOS_indet_addr_quick() are available.  If ipconfigINCLUDE_FULL_INET_ADDR is
  not set to 1 then only FreeRTOS_indet_addr_quick() is available. */
  #define ipconfigINCLUDE_FULL_INET_ADDR	1
  
  /* ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS defines the total number of network buffer that
  are available to the IP stack.  The total number of network buffers is limited
  to ensure the total amount of RAM that can be consumed by the IP stack is capped
  to a pre-determinable value. */
  #define ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS		60
  
  /* A FreeRTOS queue is used to send events from application tasks to the IP
  stack.  ipconfigEVENT_QUEUE_LENGTH sets the maximum number of events that can
  be queued for processing at any one time.  The event queue must be a minimum of
  5 greater than the total number of network buffers. */
  #define ipconfigEVENT_QUEUE_LENGTH		( ipconfigNUM_NETWORK_BUFFER_DESCRIPTORS + 5 )
  
  /* The address of a socket is the combination of its IP address and its port
  number.  FreeRTOS_bind() is used to manually allocate a port number to a socket
  (to 'bind' the socket to a port), but manual binding is not normally necessary
  for client sockets (those sockets that initiate outgoing connections rather than
  wait for incoming connections on a known port number).  If
  ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND is set to 1 then calling
  FreeRTOS_sendto() on a socket that has not yet been bound will result in the IP
  stack automatically binding the socket to a port number from the range
  socketAUTO_PORT_ALLOCATION_START_NUMBER to 0xffff.  If
  ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND is set to 0 then calling FreeRTOS_sendto()
  on a socket that has not yet been bound will result in the send operation being
  aborted. */
  #define ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND 1
  
  /* Defines the Time To Live (TTL) values used in outgoing UDP packets. */
  #define ipconfigUDP_TIME_TO_LIVE		128
  #define ipconfigTCP_TIME_TO_LIVE		128 /* also defined in FreeRTOSIPConfigDefaults.h */
  
  /* USE_TCP: Use TCP and all its features */
  #define ipconfigUSE_TCP				( 1 )
  
  /* USE_WIN: Let TCP use windowing mechanism. */
  #define ipconfigUSE_TCP_WIN			( 1 )
  
  /* The MTU is the maximum number of bytes the payload of a network frame can
  contain.  For normal Ethernet V2 frames the maximum MTU is 1500.  Setting a
  lower value can save RAM, depending on the buffer management scheme used.  If
  ipconfigCAN_FRAGMENT_OUTGOING_PACKETS is 1 then (ipconfigNETWORK_MTU - 28) must
  be divisible by 8. */
  #define ipconfigNETWORK_MTU		1200
  
  /* Set ipconfigUSE_DNS to 1 to include a basic DNS client/resolver.  DNS is used
  through the FreeRTOS_gethostbyname() API function. */
  #define ipconfigUSE_DNS			1
  
  /* If ipconfigREPLY_TO_INCOMING_PINGS is set to 1 then the IP stack will
  generate replies to incoming ICMP echo (ping) requests. */
  #define ipconfigREPLY_TO_INCOMING_PINGS				1
  
  /* If ipconfigSUPPORT_OUTGOING_PINGS is set to 1 then the
  FreeRTOS_SendPingRequest() API function is available. */
  #define ipconfigSUPPORT_OUTGOING_PINGS				0
  
  /* If ipconfigSUPPORT_SELECT_FUNCTION is set to 1 then the FreeRTOS_select()
  (and associated) API function is available. */
  #define ipconfigSUPPORT_SELECT_FUNCTION				1
  
  /* If ipconfigFILTER_OUT_NON_ETHERNET_II_FRAMES is set to 1 then Ethernet frames
  that are not in Ethernet II format will be dropped.  This option is included for
  potential future IP stack developments. */
  #define ipconfigFILTER_OUT_NON_ETHERNET_II_FRAMES  1
  
  /* If ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES is set to 1 then it is the
  responsibility of the Ethernet interface to filter out packets that are of no
  interest.  If the Ethernet interface does not implement this functionality, then
  set ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES to 0 to have the IP stack
  perform the filtering instead (it is much less efficient for the stack to do it
  because the packet will already have been passed into the stack).  If the
  Ethernet driver does all the necessary filtering in hardware then software
  filtering can be removed by using a value other than 1 or 0. */
  #define ipconfigETHERNET_DRIVER_FILTERS_FRAME_TYPES	1
  
  /* The windows simulator cannot really simulate MAC interrupts, and needs to
  block occasionally to allow other tasks to run. */
  #define configWINDOWS_MAC_INTERRUPT_SIMULATOR_DELAY ( 20 / portTICK_PERIOD_MS )
  
  /* Advanced only: in order to access 32-bit fields in the IP packets with
  32-bit memory instructions, all packets will be stored 32-bit-aligned, plus 16-bits.
  This has to do with the contents of the IP-packets: all 32-bit fields are
  32-bit-aligned, plus 16-bit(!) */
  #define ipconfigPACKET_FILLER_SIZE 2
  
  /* Define the size of the pool of TCP window descriptors.  On the average, each
  TCP socket will use up to 2 x 6 descriptors, meaning that it can have 2 x 6
  outstanding packets (for Rx and Tx).  When using up to 10 TP sockets
  simultaneously, one could define TCP_WIN_SEG_COUNT as 120. */
  #define ipconfigTCP_WIN_SEG_COUNT		240
  
  /* Each TCP socket has a circular buffers for Rx and Tx, which have a fixed
  maximum size.  Define the size of Rx buffer for TCP sockets. */
  #define ipconfigTCP_RX_BUFFER_LENGTH			( 1000 )
  
  /* Define the size of Tx buffer for TCP sockets. */
  #define ipconfigTCP_TX_BUFFER_LENGTH			( 1000 )
  
  /* When using call-back handlers, the driver may check if the handler points to
  real program memory (RAM or flash) or just has a random non-zero value. */
  #define ipconfigIS_VALID_PROG_ADDRESS(x) ( (x) != NULL )
  
  /* Include support for TCP hang protection.  All sockets in a connecting or
  disconnecting stage will timeout after a period of non-activity. */
  #define ipconfigTCP_HANG_PROTECTION			( 1 )
  #define ipconfigTCP_HANG_PROTECTION_TIME	( 30 )
  
  /* Include support for TCP keep-alive messages. */
  #define ipconfigTCP_KEEP_ALIVE				( 1 )
  #define ipconfigTCP_KEEP_ALIVE_INTERVAL		( 20 ) /* in seconds */
  
  #define portINLINE __inline
  
  #endif /* FREERTOS_IP_CONFIG_H */
  