improve lora time sync accuracy
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@ -6,7 +6,7 @@
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#include "timekeeper.h"
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#define TIME_SYNC_FRAME_LENGTH 6 // timeserver answer frame length [bytes]
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#define TIME_SYNC_FIXUP 16 // compensation for processing time [milliseconds]
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#define TIME_SYNC_FIXUP 25 // compensation for processing time [milliseconds]
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#define TIME_SYNC_MAX_SEQNO 0xfe // threshold for wrap around time_sync_seqNo
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#define TIME_SYNC_END_FLAG (TIME_SYNC_MAX_SEQNO + 1) // end of handshake marker
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#define GPS_UTC_DIFF 315964800UL // seconds diff between gps and utc epoch
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@ -130,18 +130,18 @@ void IRAM_ATTR timesync_processReq(void *taskparameter) {
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// calculate average time offset over the summed up difference
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time_offset_ms /= TIME_SYNC_SAMPLES;
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// add milliseconds from latest gateway time, and apply a compensation
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// constant for processing times on node and gateway, strip full seconds
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time_offset_ms += timesync_timestamp[sample_idx - 1][gwtime_msec];
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time_offset_ms -= TIME_SYNC_FIXUP;
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time_offset_ms %= 1000;
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// take latest timestamp received from gateway
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// and add time difference rounded to whole seconds
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time_offset_sec = timesync_timestamp[sample_idx - 1][gwtime_sec];
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time_offset_sec += time_offset_ms / 1000;
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// add milliseconds from latest gateway time, and apply a compensation
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// constant for processing times on node and gateway, strip full seconds
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time_offset_ms += timesync_timestamp[sample_idx - 1][gwtime_msec];
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time_offset_ms += TIME_SYNC_FIXUP;
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time_offset_ms %= 1000;
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ESP_LOGD(TAG, "LORA date/time: %s",
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myTZ.dateTime(time_offset_sec, "d.M Y H:i:s.v T").c_str());
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