[457] | 1 | /**
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| 2 | * @file
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| 3 | * SNTP client options list
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (c) 2007-2009 Fr辿d辿ric Bernon, Simon Goldschmidt
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| 8 | * All rights reserved.
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| 9 | *
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| 10 | * Redistribution and use in source and binary forms, with or without modification,
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| 11 | * are permitted provided that the following conditions are met:
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| 12 | *
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| 13 | * 1. Redistributions of source code must retain the above copyright notice,
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| 14 | * this list of conditions and the following disclaimer.
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| 15 | * 2. Redistributions in binary form must reproduce the above copyright notice,
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| 16 | * this list of conditions and the following disclaimer in the documentation
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| 17 | * and/or other materials provided with the distribution.
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| 18 | * 3. The name of the author may not be used to endorse or promote products
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| 19 | * derived from this software without specific prior written permission.
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| 20 | *
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| 21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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| 22 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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| 23 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
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| 24 | * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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| 25 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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| 26 | * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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| 27 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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| 28 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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| 29 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
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| 30 | * OF SUCH DAMAGE.
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| 31 | *
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| 32 | * This file is part of the lwIP TCP/IP stack.
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| 33 | *
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| 34 | * Author: Fr辿d辿ric Bernon, Simon Goldschmidt
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| 35 | *
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| 36 | */
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| 37 | #ifndef LWIP_HDR_APPS_SNTP_OPTS_H
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| 38 | #define LWIP_HDR_APPS_SNTP_OPTS_H
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| 39 |
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| 40 | #include "lwip/opt.h"
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| 41 | #include "lwip/prot/iana.h"
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| 42 |
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| 43 | /**
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| 44 | * @defgroup sntp_opts Options
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| 45 | * @ingroup sntp
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| 46 | * @{
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| 47 | */
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| 48 |
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| 49 | /** SNTP macro to change system time in seconds
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| 50 | * Define SNTP_SET_SYSTEM_TIME_US(sec, us) to set the time in microseconds
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| 51 | * instead of this one if you need the additional precision. Alternatively,
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| 52 | * define SNTP_SET_SYSTEM_TIME_NTP(sec, frac) in order to work with native
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| 53 | * NTP timestamps instead.
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| 54 | */
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| 55 | #if !defined SNTP_SET_SYSTEM_TIME || defined __DOXYGEN__
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| 56 | #define SNTP_SET_SYSTEM_TIME(sec) LWIP_UNUSED_ARG(sec)
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| 57 | #endif
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| 58 |
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| 59 | /** The maximum number of SNTP servers that can be set */
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| 60 | #if !defined SNTP_MAX_SERVERS || defined __DOXYGEN__
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| 61 | #define SNTP_MAX_SERVERS LWIP_DHCP_MAX_NTP_SERVERS
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| 62 | #endif
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| 63 |
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| 64 | /** Set this to 1 to implement the callback function called by dhcp when
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| 65 | * NTP servers are received. */
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| 66 | #if !defined SNTP_GET_SERVERS_FROM_DHCP || defined __DOXYGEN__
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| 67 | #define SNTP_GET_SERVERS_FROM_DHCP LWIP_DHCP_GET_NTP_SRV
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| 68 | #endif
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| 69 |
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| 70 | /** Set this to 1 to support DNS names (or IP address strings) to set sntp servers
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| 71 | * One server address/name can be defined as default if SNTP_SERVER_DNS == 1:
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| 72 | * \#define SNTP_SERVER_ADDRESS "pool.ntp.org"
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| 73 | */
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| 74 | #if !defined SNTP_SERVER_DNS || defined __DOXYGEN__
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| 75 | #define SNTP_SERVER_DNS 0
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| 76 | #endif
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| 77 |
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| 78 | /**
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| 79 | * SNTP_DEBUG: Enable debugging for SNTP.
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| 80 | */
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| 81 | #if !defined SNTP_DEBUG || defined __DOXYGEN__
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| 82 | #define SNTP_DEBUG LWIP_DBG_OFF
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| 83 | #endif
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| 84 |
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| 85 | /** SNTP server port */
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| 86 | #if !defined SNTP_PORT || defined __DOXYGEN__
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| 87 | #define SNTP_PORT LWIP_IANA_PORT_SNTP
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| 88 | #endif
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| 89 |
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| 90 | /** Sanity check:
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| 91 | * Define this to
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| 92 | * - 0 to turn off sanity checks (default; smaller code)
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| 93 | * - >= 1 to check address and port of the response packet to ensure the
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| 94 | * response comes from the server we sent the request to.
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| 95 | * - >= 2 to check returned Originate Timestamp against Transmit Timestamp
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| 96 | * sent to the server (to ensure response to older request).
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| 97 | * - >= 3 @todo: discard reply if any of the VN, Stratum, or Transmit Timestamp
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| 98 | * fields is 0 or the Mode field is not 4 (unicast) or 5 (broadcast).
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| 99 | * - >= 4 @todo: to check that the Root Delay and Root Dispersion fields are each
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| 100 | * greater than or equal to 0 and less than infinity, where infinity is
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| 101 | * currently a cozy number like one second. This check avoids using a
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| 102 | * server whose synchronization source has expired for a very long time.
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| 103 | */
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| 104 | #if !defined SNTP_CHECK_RESPONSE || defined __DOXYGEN__
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| 105 | #define SNTP_CHECK_RESPONSE 0
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| 106 | #endif
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| 107 |
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| 108 | /** Enable round-trip delay compensation.
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| 109 | * Compensate for the round-trip delay by calculating the clock offset from
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| 110 | * the originate, receive, transmit and destination timestamps, as per RFC.
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| 111 | *
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| 112 | * The calculation requires compiler support for 64-bit integers. Also, either
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| 113 | * SNTP_SET_SYSTEM_TIME_US or SNTP_SET_SYSTEM_TIME_NTP has to be implemented
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| 114 | * for setting the system clock with sub-second precision. Likewise, either
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| 115 | * SNTP_GET_SYSTEM_TIME or SNTP_GET_SYSTEM_TIME_NTP needs to be implemented
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| 116 | * with sub-second precision.
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| 117 | *
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| 118 | * Although not strictly required, it makes sense to combine this option with
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| 119 | * SNTP_CHECK_RESPONSE >= 2 for sanity-checking of the received timestamps.
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| 120 | * Also, in order for the round-trip calculation to work, the difference
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| 121 | * between the local clock and the NTP server clock must not be larger than
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| 122 | * about 34 years. If that limit is exceeded, the implementation will fall back
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| 123 | * to setting the clock without compensation. In order to ensure that the local
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| 124 | * clock is always within the permitted range for compensation, even at first
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| 125 | * try, it may be necessary to store at least the current year in non-volatile
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| 126 | * memory.
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| 127 | */
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| 128 | #if !defined SNTP_COMP_ROUNDTRIP || defined __DOXYGEN__
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| 129 | #define SNTP_COMP_ROUNDTRIP 0
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| 130 | #endif
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| 131 |
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| 132 | /** According to the RFC, this shall be a random delay
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| 133 | * between 1 and 5 minutes (in milliseconds) to prevent load peaks.
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| 134 | * This can be defined to a random generation function,
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| 135 | * which must return the delay in milliseconds as u32_t.
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| 136 | * Turned off by default.
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| 137 | */
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| 138 | #if !defined SNTP_STARTUP_DELAY || defined __DOXYGEN__
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| 139 | #ifdef LWIP_RAND
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| 140 | #define SNTP_STARTUP_DELAY 1
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| 141 | #else
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| 142 | #define SNTP_STARTUP_DELAY 0
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| 143 | #endif
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| 144 | #endif
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| 145 |
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| 146 | /** If you want the startup delay to be a function, define this
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| 147 | * to a function (including the brackets) and define SNTP_STARTUP_DELAY to 1.
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| 148 | */
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| 149 | #if !defined SNTP_STARTUP_DELAY_FUNC || defined __DOXYGEN__
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| 150 | #define SNTP_STARTUP_DELAY_FUNC (LWIP_RAND() % 5000)
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| 151 | #endif
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| 152 |
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| 153 | /** SNTP receive timeout - in milliseconds
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| 154 | * Also used as retry timeout - this shouldn't be too low.
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| 155 | * Default is 15 seconds. Must not be beolw 15 seconds by specification (i.e. 15000)
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| 156 | */
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| 157 | #if !defined SNTP_RECV_TIMEOUT || defined __DOXYGEN__
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| 158 | #define SNTP_RECV_TIMEOUT 15000
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| 159 | #endif
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| 160 |
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| 161 | /** SNTP update delay - in milliseconds
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| 162 | * Default is 1 hour. Must not be beolw 60 seconds by specification (i.e. 60000)
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| 163 | */
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| 164 | #if !defined SNTP_UPDATE_DELAY || defined __DOXYGEN__
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| 165 | #define SNTP_UPDATE_DELAY 3600000
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| 166 | #endif
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| 167 |
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| 168 | /** SNTP macro to get system time, used with SNTP_CHECK_RESPONSE >= 2
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| 169 | * to send in request and compare in response. Also used for round-trip
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| 170 | * delay compensation if SNTP_COMP_ROUNDTRIP != 0.
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| 171 | * Alternatively, define SNTP_GET_SYSTEM_TIME_NTP(sec, frac) in order to
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| 172 | * work with native NTP timestamps instead.
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| 173 | */
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| 174 | #if !defined SNTP_GET_SYSTEM_TIME || defined __DOXYGEN__
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| 175 | #define SNTP_GET_SYSTEM_TIME(sec, us) do { (sec) = 0; (us) = 0; } while(0)
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| 176 | #endif
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| 177 |
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| 178 | /** Default retry timeout (in milliseconds) if the response
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| 179 | * received is invalid.
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| 180 | * This is doubled with each retry until SNTP_RETRY_TIMEOUT_MAX is reached.
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| 181 | */
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| 182 | #if !defined SNTP_RETRY_TIMEOUT || defined __DOXYGEN__
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| 183 | #define SNTP_RETRY_TIMEOUT SNTP_RECV_TIMEOUT
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| 184 | #endif
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| 185 |
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| 186 | /** Maximum retry timeout (in milliseconds). */
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| 187 | #if !defined SNTP_RETRY_TIMEOUT_MAX || defined __DOXYGEN__
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| 188 | #define SNTP_RETRY_TIMEOUT_MAX (SNTP_RETRY_TIMEOUT * 10)
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| 189 | #endif
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| 190 |
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| 191 | /** Increase retry timeout with every retry sent
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| 192 | * Default is on to conform to RFC.
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| 193 | */
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| 194 | #if !defined SNTP_RETRY_TIMEOUT_EXP || defined __DOXYGEN__
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| 195 | #define SNTP_RETRY_TIMEOUT_EXP 1
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| 196 | #endif
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| 197 |
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| 198 | /** Keep a reachability shift register per server
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| 199 | * Default is on to conform to RFC.
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| 200 | */
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| 201 | #if !defined SNTP_MONITOR_SERVER_REACHABILITY || defined __DOXYGEN__
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| 202 | #define SNTP_MONITOR_SERVER_REACHABILITY 1
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| 203 | #endif
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| 204 |
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| 205 | /**
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| 206 | * @}
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| 207 | */
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| 208 |
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| 209 | #endif /* LWIP_HDR_APPS_SNTP_OPTS_H */
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