DigitalInfinity/ESP32-PaxCounter
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extract timezone from time sync answer and add to UTC timestamp

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This commit is contained in:
Marius Gripp 2019-09-03 16:28:11 +02:00
parent 81055ed981
commit f86bfaefb6
2 changed files with 10 additions and 5 deletions
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2
include/timesync.h
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@ -7,7 +7,7 @@
#include "timekeeper.h"
//#define TIME_SYNC_TRIGGER 100 // threshold for time sync [milliseconds]
#define TIME_SYNC_FRAME_LENGTH 0x05 // timeserver answer frame length [bytes]
#define TIME_SYNC_FRAME_LENGTH 0x07 // timeserver answer frame length [bytes]
#define TIME_SYNC_FIXUP 4 // calibration to fixup processing time [milliseconds]
void timesync_init(void);

11
src/timesync.cpp
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@ -177,9 +177,14 @@ int recv_timesync_ans(const uint8_t seq_no, const uint8_t buf[], const uint8_t b
// the 5th byte contains the fractional seconds in 2^-8 second steps
// (= 1/250th sec), we convert this to ms
uint16_t timestamp_msec = 4 * buf[4];
// pointers to 4 bytes containing UTC seconds since unix epoch, msb
uint16_t timestamp_msec = 4 * buf[6];
// pointers to 4 bytes 4 bytes containing UTC seconds since unix epoch, msb
uint32_t timestamp_sec, *timestamp_ptr;
uint32_t timezone_sec;
// extract timezone from buffer (in 15min steps, one step being 15min * 60s = 900s)
timezone_sec = buf[0]*900;
buf++;
// convert buffer to uint32_t, octet order is big endian
timestamp_ptr = (uint32_t *)buf;
@ -187,7 +192,7 @@ int recv_timesync_ans(const uint8_t seq_no, const uint8_t buf[], const uint8_t b
timestamp_sec = __builtin_bswap32(*timestamp_ptr);
// construct the timepoint when message was seen on gateway
time_sync_rx[k] += seconds(timestamp_sec) + milliseconds(timestamp_msec);
time_sync_rx[k] += seconds(timestamp_sec+timezone_sec) + milliseconds(timestamp_msec);
// we guess timepoint is recent if it newer than code compile date
if (timeIsValid(myClock::to_time_t(time_sync_rx[k]))) {