Andrew Boyson / Mbed 2 deprecated iot

Backing up an unused program in case of future need

Dependencies:   mbed

ntp.cpp@0:09f915e6f9f6, 2016-04-13 (annotated)

Committer:
andrewboyson
Date:
Wed Apr 13 09:21:02 2016 +0000
Revision:
0:09f915e6f9f6
Child:
2:06fa34661f19
Fixed memory allocation issues and added enumeration to log.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 0:09f915e6f9f6 1 #include <mbed.h>
andrewboyson 0:09f915e6f9f6 2 #include "log.h"
andrewboyson 0:09f915e6f9f6 3 #include "esp.h"
andrewboyson 0:09f915e6f9f6 4 #include "wifi.h"
andrewboyson 0:09f915e6f9f6 5 #include "time.h"
andrewboyson 0:09f915e6f9f6 6 #include "io.h"
andrewboyson 0:09f915e6f9f6 7 #include "at.h"
andrewboyson 0:09f915e6f9f6 8
andrewboyson 0:09f915e6f9f6 9 #define GET_TIME_INTERVAL 600
andrewboyson 0:09f915e6f9f6 10 #define RETRY_INTERVAL 60
andrewboyson 0:09f915e6f9f6 11
andrewboyson 0:09f915e6f9f6 12 #define ID 0
andrewboyson 0:09f915e6f9f6 13
andrewboyson 0:09f915e6f9f6 14 #define SIXTEENTHS_TO_ADD 1
andrewboyson 0:09f915e6f9f6 15
andrewboyson 0:09f915e6f9f6 16 Timer timer;
andrewboyson 0:09f915e6f9f6 17
andrewboyson 0:09f915e6f9f6 18 struct Packet {
andrewboyson 0:09f915e6f9f6 19 /*
andrewboyson 0:09f915e6f9f6 20 LI: 00 no warning; 01 last minute has 61 seconds; 10 last minute has 59 seconds; 11 alarm condition (clock not synchronized)
andrewboyson 0:09f915e6f9f6 21 VN: 3 = 011
andrewboyson 0:09f915e6f9f6 22 Mode: 3 = 011 for client request; 4 = 100 for server reply
andrewboyson 0:09f915e6f9f6 23 0 1 2 3
andrewboyson 0:09f915e6f9f6 24 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
andrewboyson 0:09f915e6f9f6 25 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
andrewboyson 0:09f915e6f9f6 26 |LI | VN |Mode | Stratum | Poll | Precision |
andrewboyson 0:09f915e6f9f6 27 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
andrewboyson 0:09f915e6f9f6 28 |0 0 0 1|1 0 1 1|
andrewboyson 0:09f915e6f9f6 29
andrewboyson 0:09f915e6f9f6 30 Mode: If the Mode field of the request is 3 (client), the reply is set to 4 (server).
andrewboyson 0:09f915e6f9f6 31 If this field is set to 1 (symmetric active), the reply is set to 2 (symmetric passive).
andrewboyson 0:09f915e6f9f6 32 This allows clients configured in either client (NTP mode 3) or symmetric active (NTP mode 1) to
andrewboyson 0:09f915e6f9f6 33 interoperate successfully, even if configured in possibly suboptimal ways.
andrewboyson 0:09f915e6f9f6 34
andrewboyson 0:09f915e6f9f6 35 Poll: signed integer indicating the minimum interval between transmitted messages, in seconds as a power of two.
andrewboyson 0:09f915e6f9f6 36 For instance, a value of six indicates a minimum interval of 64 seconds.
andrewboyson 0:09f915e6f9f6 37
andrewboyson 0:09f915e6f9f6 38 Precision: signed integer indicating the precision of the various clocks, in seconds to the nearest power of two.
andrewboyson 0:09f915e6f9f6 39 The value must be rounded to the next larger power of two;
andrewboyson 0:09f915e6f9f6 40 for instance, a 50-Hz (20 ms) or 60-Hz (16.67 ms) power-frequency clock would be assigned the value -5 (31.25 ms),
andrewboyson 0:09f915e6f9f6 41 while a 1000-Hz (1 ms) crystal-controlled clock would be assigned the value -9 (1.95 ms).
andrewboyson 0:09f915e6f9f6 42
andrewboyson 0:09f915e6f9f6 43 Root Delay (rootdelay): Total round-trip delay to the reference clock, in NTP short format (16bitseconds; 16bit fraction).
andrewboyson 0:09f915e6f9f6 44
andrewboyson 0:09f915e6f9f6 45 Root Dispersion (rootdisp): Total dispersion to the reference clock, in NTP short format (16bitseconds; 16bit fraction)..
andrewboyson 0:09f915e6f9f6 46 */
andrewboyson 0:09f915e6f9f6 47 union
andrewboyson 0:09f915e6f9f6 48 {
andrewboyson 0:09f915e6f9f6 49 uint32_t FirstLine;
andrewboyson 0:09f915e6f9f6 50 struct
andrewboyson 0:09f915e6f9f6 51 {
andrewboyson 0:09f915e6f9f6 52 unsigned Mode : 3;
andrewboyson 0:09f915e6f9f6 53 unsigned VN : 3;
andrewboyson 0:09f915e6f9f6 54 unsigned LI : 2;
andrewboyson 0:09f915e6f9f6 55 uint8_t Stratum;
andrewboyson 0:09f915e6f9f6 56 int8_t Poll;
andrewboyson 0:09f915e6f9f6 57 int8_t Precision;
andrewboyson 0:09f915e6f9f6 58 };
andrewboyson 0:09f915e6f9f6 59 };
andrewboyson 0:09f915e6f9f6 60 uint32_t RootDelay;
andrewboyson 0:09f915e6f9f6 61 uint32_t Dispersion;
andrewboyson 0:09f915e6f9f6 62 uint32_t RefIdentifier;
andrewboyson 0:09f915e6f9f6 63
andrewboyson 0:09f915e6f9f6 64 uint64_t RefTimeStamp;
andrewboyson 0:09f915e6f9f6 65 uint64_t OriTimeStamp;
andrewboyson 0:09f915e6f9f6 66 uint64_t RecTimeStamp;
andrewboyson 0:09f915e6f9f6 67 uint64_t TraTimeStamp;
andrewboyson 0:09f915e6f9f6 68 };
andrewboyson 0:09f915e6f9f6 69 static struct Packet packet;
andrewboyson 0:09f915e6f9f6 70
andrewboyson 0:09f915e6f9f6 71 static uint64_t ntohll(uint64_t n) {
andrewboyson 0:09f915e6f9f6 72 int testInt = 0x0001; //Big end contains 0x00; little end contains 0x01
andrewboyson 0:09f915e6f9f6 73 int *pTestInt = &testInt;
andrewboyson 0:09f915e6f9f6 74 char *pTestByte = (char*)pTestInt;
andrewboyson 0:09f915e6f9f6 75 char testByte = *pTestByte; //fetch the first byte
andrewboyson 0:09f915e6f9f6 76 if (testByte == 0x00) return n; //If the first byte is the big end then host and network have same endianess
andrewboyson 0:09f915e6f9f6 77
andrewboyson 0:09f915e6f9f6 78 union ull
andrewboyson 0:09f915e6f9f6 79 {
andrewboyson 0:09f915e6f9f6 80 uint64_t Whole;
andrewboyson 0:09f915e6f9f6 81 char Bytes[8];
andrewboyson 0:09f915e6f9f6 82 };
andrewboyson 0:09f915e6f9f6 83 union ull h;
andrewboyson 0:09f915e6f9f6 84 h.Whole = n;
andrewboyson 0:09f915e6f9f6 85
andrewboyson 0:09f915e6f9f6 86 char t;
andrewboyson 0:09f915e6f9f6 87 t = h.Bytes[7]; h.Bytes[7] = h.Bytes[0]; h.Bytes[0] = t;
andrewboyson 0:09f915e6f9f6 88 t = h.Bytes[6]; h.Bytes[6] = h.Bytes[1]; h.Bytes[1] = t;
andrewboyson 0:09f915e6f9f6 89 t = h.Bytes[5]; h.Bytes[5] = h.Bytes[2]; h.Bytes[2] = t;
andrewboyson 0:09f915e6f9f6 90 t = h.Bytes[4]; h.Bytes[4] = h.Bytes[3]; h.Bytes[3] = t;
andrewboyson 0:09f915e6f9f6 91
andrewboyson 0:09f915e6f9f6 92 return h.Whole;
andrewboyson 0:09f915e6f9f6 93 }
andrewboyson 0:09f915e6f9f6 94 uint64_t getTimeAsNtp()
andrewboyson 0:09f915e6f9f6 95 {
andrewboyson 0:09f915e6f9f6 96 uint64_t ntpTime = 2208988800ULL << 32;
andrewboyson 0:09f915e6f9f6 97 ntpTime += TimeGet16ths() << 28;
andrewboyson 0:09f915e6f9f6 98 return ntpTime;
andrewboyson 0:09f915e6f9f6 99 }
andrewboyson 0:09f915e6f9f6 100 void setTimeAsNtp(uint64_t ntpTime)
andrewboyson 0:09f915e6f9f6 101 {
andrewboyson 0:09f915e6f9f6 102 ntpTime -= 2208988800ULL << 32;
andrewboyson 0:09f915e6f9f6 103 uint64_t time16ths = (ntpTime >> 28) + SIXTEENTHS_TO_ADD;
andrewboyson 0:09f915e6f9f6 104 TimeSet16ths(time16ths);
andrewboyson 0:09f915e6f9f6 105 }
andrewboyson 0:09f915e6f9f6 106 void NtpInit()
andrewboyson 0:09f915e6f9f6 107 {
andrewboyson 0:09f915e6f9f6 108 EspIpdReserved[ID] = true;
andrewboyson 0:09f915e6f9f6 109 }
andrewboyson 0:09f915e6f9f6 110 int preparePacket()
andrewboyson 0:09f915e6f9f6 111 {
andrewboyson 0:09f915e6f9f6 112 memset(&packet, 0, sizeof(packet));
andrewboyson 0:09f915e6f9f6 113 packet.LI = 0;
andrewboyson 0:09f915e6f9f6 114 packet.VN = 1;
andrewboyson 0:09f915e6f9f6 115 packet.Mode = 3; //Client
andrewboyson 0:09f915e6f9f6 116 packet.TraTimeStamp = ntohll(getTimeAsNtp());
andrewboyson 0:09f915e6f9f6 117 return 0;
andrewboyson 0:09f915e6f9f6 118 }
andrewboyson 0:09f915e6f9f6 119 int handlePacket()
andrewboyson 0:09f915e6f9f6 120 {
andrewboyson 0:09f915e6f9f6 121
andrewboyson 0:09f915e6f9f6 122 //Handle the reply
andrewboyson 0:09f915e6f9f6 123 char leap = packet.LI;
andrewboyson 0:09f915e6f9f6 124 char version = packet.VN;
andrewboyson 0:09f915e6f9f6 125 char mode = packet.Mode;
andrewboyson 0:09f915e6f9f6 126 char stratum = packet.Stratum;
andrewboyson 0:09f915e6f9f6 127 if (leap == 3) { LogF("Remote clock has a fault\r\n"); return -1; }
andrewboyson 0:09f915e6f9f6 128 if (version < 1) { LogF("Version is %d\r\n", version); return -1; }
andrewboyson 0:09f915e6f9f6 129 if (mode != 4) { LogF("Mode is %d\r\n", mode); return -1; }
andrewboyson 0:09f915e6f9f6 130 if (stratum == 0) { LogF("Received Kiss of Death packet (stratum is 0)\r\n"); return -1; }
andrewboyson 0:09f915e6f9f6 131
andrewboyson 0:09f915e6f9f6 132 /*
andrewboyson 0:09f915e6f9f6 133 See http://www.eecis.udel.edu/~mills/time.html for timestamp calculations
andrewboyson 0:09f915e6f9f6 134 Ori
andrewboyson 0:09f915e6f9f6 135 ----t1---------t4---- RTC
andrewboyson 0:09f915e6f9f6 136 \ /
andrewboyson 0:09f915e6f9f6 137 -------t2---t3------- NTP
andrewboyson 0:09f915e6f9f6 138 Rec Tra
andrewboyson 0:09f915e6f9f6 139 offset (RTC - NTP) = (t1 + t4)/2 - (t2 + t3)/2 ==> [(t1 - t2) + (t4 - t3)] / 2
andrewboyson 0:09f915e6f9f6 140 delay = (t4 - t1) - (t3 - t2)
andrewboyson 0:09f915e6f9f6 141 */
andrewboyson 0:09f915e6f9f6 142
andrewboyson 0:09f915e6f9f6 143 //Set the RTC
andrewboyson 0:09f915e6f9f6 144 setTimeAsNtp(ntohll(packet.RecTimeStamp));
andrewboyson 0:09f915e6f9f6 145
andrewboyson 0:09f915e6f9f6 146 return 0;
andrewboyson 0:09f915e6f9f6 147 }
andrewboyson 0:09f915e6f9f6 148 int NtpIdConnectStatus = AT_NONE;
andrewboyson 0:09f915e6f9f6 149 static void outgoingMain()
andrewboyson 0:09f915e6f9f6 150 {
andrewboyson 0:09f915e6f9f6 151 if (AtBusy()) return;
andrewboyson 0:09f915e6f9f6 152 if (!WifiStarted()) return;
andrewboyson 0:09f915e6f9f6 153
andrewboyson 0:09f915e6f9f6 154 static int firstAttempt = true;
andrewboyson 0:09f915e6f9f6 155 static int result = AT_NONE;
andrewboyson 0:09f915e6f9f6 156
andrewboyson 0:09f915e6f9f6 157 if (NtpIdConnectStatus == AT_SUCCESS)
andrewboyson 0:09f915e6f9f6 158 {
andrewboyson 0:09f915e6f9f6 159 int retryAfterFailure = timer.read() > RETRY_INTERVAL && result != AT_SUCCESS;
andrewboyson 0:09f915e6f9f6 160 int repeat = timer.read() > GET_TIME_INTERVAL;
andrewboyson 0:09f915e6f9f6 161
andrewboyson 0:09f915e6f9f6 162 if (firstAttempt || retryAfterFailure || repeat)
andrewboyson 0:09f915e6f9f6 163 {
andrewboyson 0:09f915e6f9f6 164 preparePacket();
andrewboyson 0:09f915e6f9f6 165 AtSendData(ID, sizeof(packet), &packet, &result);
andrewboyson 0:09f915e6f9f6 166 firstAttempt = false;
andrewboyson 0:09f915e6f9f6 167 timer.reset();
andrewboyson 0:09f915e6f9f6 168 timer.start();
andrewboyson 0:09f915e6f9f6 169 }
andrewboyson 0:09f915e6f9f6 170 }
andrewboyson 0:09f915e6f9f6 171 else
andrewboyson 0:09f915e6f9f6 172 {
andrewboyson 0:09f915e6f9f6 173 AtConnectId(ID, "UDP", "192.168.1.3", 123, &packet, sizeof(packet), &NtpIdConnectStatus);
andrewboyson 0:09f915e6f9f6 174 }
andrewboyson 0:09f915e6f9f6 175 }
andrewboyson 0:09f915e6f9f6 176 static void incomingMain()
andrewboyson 0:09f915e6f9f6 177 {
andrewboyson 0:09f915e6f9f6 178 if (EspDataAvailable == ESP_AVAILABLE && EspIpdId == ID)
andrewboyson 0:09f915e6f9f6 179 {
andrewboyson 0:09f915e6f9f6 180 if (EspIpdLength == sizeof(packet)) handlePacket();
andrewboyson 0:09f915e6f9f6 181 else LogF("Incorrect NTP packet length of %d bytes", EspIpdLength);
andrewboyson 0:09f915e6f9f6 182 }
andrewboyson 0:09f915e6f9f6 183 }
andrewboyson 0:09f915e6f9f6 184 int NtpMain()
andrewboyson 0:09f915e6f9f6 185 {
andrewboyson 0:09f915e6f9f6 186 outgoingMain();
andrewboyson 0:09f915e6f9f6 187 incomingMain();
andrewboyson 0:09f915e6f9f6 188 return 0;
andrewboyson 0:09f915e6f9f6 189 }