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retain telemetry across transport outages

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This commit is contained in:
Jay
2026-08-17 14:00:14 -04:00
parent bc4a2856e1
commit 291c6b54e6
11 changed files with 222 additions and 37 deletions
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main/trikke_protocol.c
+20 -3
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@@ -85,6 +85,18 @@ static void encode_header(uint8_t *output,
put_u32_le(output + 32, 0);
}
bool trikke_wire_timestamp_delta_fits(
int64_t previous_timestamp_us,
int64_t timestamp_us)
{
if (timestamp_us < previous_timestamp_us) {
return false;
}
const uint64_t delta_us =
(uint64_t)timestamp_us - (uint64_t)previous_timestamp_us;
return delta_us <= TRIKKE_WIRE_MAX_TIMESTAMP_DELTA_US;
}
size_t trikke_encode_metadata_packet(
uint8_t *output,
size_t output_size,
@@ -159,12 +171,17 @@ size_t trikke_encode_sample_packet(
i * TRIKKE_WIRE_SAMPLE_RECORD_SIZE;
uint16_t timestamp_delta_10us = 0;
if (i > 0) {
const int64_t delta_us = samples[i].timestamp_us - previous_timestamp_us;
if (delta_us < 0 || delta_us > (int64_t)UINT16_MAX * 10) {
if (!trikke_wire_timestamp_delta_fits(
previous_timestamp_us, samples[i].timestamp_us)) {
timestamp_delta_10us = UINT16_MAX;
packet_flags |= TRIKKE_PACKET_FLAG_TIMESTAMP_DELTA_SATURATED;
} else {
timestamp_delta_10us = (uint16_t)((delta_us + 5) / 10);
const uint64_t delta_us =
(uint64_t)samples[i].timestamp_us -
(uint64_t)previous_timestamp_us;
timestamp_delta_10us = (uint16_t)(
(delta_us + TRIKKE_WIRE_TIMESTAMP_DELTA_UNIT_US / 2) /
TRIKKE_WIRE_TIMESTAMP_DELTA_UNIT_US);
}
}