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Tune unknown retry SNR

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mikecarper committed 2026-06-15 18:06:58 -07:00
1 parent cb5e2e7c3d
commit 21c5e2701b
2 files changed
+14 -5
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docs/cli_commands.md
+11 -2
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@@ -1115,8 +1115,8 @@ set direct.retry.margin 10
- Lower SNR uses more robust coding rates.
- CR6 is intentionally skipped.
- `off` disables per-packet retry CR overrides and uses the current radio CR.
- Unknown repeaters start at `+2.00 dB` for adaptive CR selection.
- A failed unknown repeater is seeded at `+1.75 dB`.
- Unknown repeaters start at `+3.00 dB` for adaptive CR selection.
- A failed unknown repeater is seeded at `+2.75 dB`.
- Each later failure lowers the SNR estimate by `0.25 dB`.
**Examples:**
@@ -1164,6 +1164,15 @@ set direct.retry.cr 20.0,12.0,6.0,2.0
- `snr_db`: SNR in dB.
- `page`: 1-based result page.
**SNR details:**
- Recent repeater SNR is stored internally in quarter-dB units.
- Heard repeater samples update an existing table entry with a weighted blend: `75%` existing SNR and `25%` new heard SNR, rounded up.
- Direct retry success also feeds the heard echo SNR back into the same weighted table.
- Direct retry failure is not weighted: each final echo-timeout failure lowers that repeater's SNR by `0.25 dB`.
- Unknown repeaters start at `+3.00 dB` for adaptive CR selection.
- If an unknown repeater fails, it is seeded into the table at `+2.75 dB`.
- `set recent.repeater <prefix> <snr_db>` seeds a missing prefix or adds another weighted sample for an existing prefix.
**Examples:**
```
get recent.repeater
examples/simple_repeater/MyMesh.cpp
+3 -3
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@@ -606,7 +606,7 @@ bool MyMesh::allowDirectRetry(const mesh::Packet* packet, const uint8_t* next_ho
if (repeater == NULL) {
// Retry unknown repeaters too. If they fail, onDirectRetryFailed() seeds the
// recent-repeater table below the +2.00 dB starting point.
// recent-repeater table below the +3.00 dB starting point.
return true;
}
int16_t retry_floor_x4 = (int16_t)getDirectRetryMinSNRX4() + (int16_t)_prefs.direct_retry_snr_margin_x4;
@@ -615,7 +615,7 @@ bool MyMesh::allowDirectRetry(const mesh::Packet* packet, const uint8_t* next_ho
void MyMesh::configureDirectRetryPacket(mesh::Packet* retry, const mesh::Packet* original, uint8_t retry_attempt) {
(void)retry_attempt;
int8_t snr_x4 = 8; // unknown repeaters start at +2.00 dB
int8_t snr_x4 = 12; // unknown repeaters start at +3.00 dB
const SimpleMeshTables* tables = static_cast<const SimpleMeshTables*>(getTables());
if (tables != NULL) {
uint8_t prefix[MAX_HASH_SIZE];
@@ -683,7 +683,7 @@ void MyMesh::onDirectRetryFailed(const uint8_t* next_hop_hash, uint8_t next_hop_
SimpleMeshTables* tables = static_cast<SimpleMeshTables*>(getTables());
if (tables != NULL) {
if (!tables->decrementRecentRepeaterSnrX4(next_hop_hash, next_hop_hash_len, 1)) {
tables->setRecentRepeater(next_hop_hash, next_hop_hash_len, 7, false, true);
tables->setRecentRepeater(next_hop_hash, next_hop_hash_len, 11, false, true);
}
}
}