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* repeater, DISCOVER_REQ, flags lowest bit now for 'prefix_only' responses

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Scott Powell
2025-11-07 19:31:09 +11:00
parent 62d7ce110b
commit 1520f4d28e
2 changed files with 9 additions and 8 deletions
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14
docs/payloads.md
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@@ -199,12 +199,12 @@ The plaintext contained in the ciphertext matches the format described in [plain
## DISCOVER_REQ (sub_type)
| Field | Size (bytes) | Description |
|--------------|-----------------|--------------------------------------------|
| flags | 1 | 0x8 (upper 4 bits) |
| type_filter | 1 | bit for each ADV_TYPE_* |
| tag | 4 | randomly generate by sender |
| since | 4 | (optional) epoch timestamp (0 by default) |
| Field | Size (bytes) | Description |
|--------------|-----------------|----------------------------------------------|
| flags | 1 | 0x8 (upper 4 bits), prefix_only (lowest bit) |
| type_filter | 1 | bit for each ADV_TYPE_* |
| tag | 4 | randomly generate by sender |
| since | 4 | (optional) epoch timestamp (0 by default) |
## DISCOVER_RESP (sub_type)
@@ -213,7 +213,7 @@ The plaintext contained in the ciphertext matches the format described in [plain
| flags | 1 | 0x9 (upper 4 bits), node_type (lower 4) |
| snr | 1 | signed, SNR*4 |
| tag | 4 | reflected back from DISCOVER_REQ |
| pubkey | 32 | node's ID |
| pubkey | 8 or 32 | node's ID (or prefix) |
# Custom packet

3
examples/simple_repeater/MyMesh.cpp
View File

@@ -636,12 +636,13 @@ void MyMesh::onControlDataRecv(mesh::Packet* packet) {
}
if ((filter & (1 << ADV_TYPE_REPEATER)) != 0 && _prefs.discovery_mod_timestamp >= since) {
bool prefix_only = packet->payload[0] & 1;
uint8_t data[6 + PUB_KEY_SIZE];
data[0] = CTL_TYPE_NODE_DISCOVER_RESP | ADV_TYPE_REPEATER; // low 4-bits for node type
data[1] = packet->_snr; // let sender know the inbound SNR ( x 4)
memcpy(&data[2], &tag, 4); // include tag from request, for client to match to
memcpy(&data[6], self_id.pub_key, PUB_KEY_SIZE);
auto resp = createControlData(data, sizeof(data));
auto resp = createControlData(data, prefix_only ? 6 + 8 : 6 + PUB_KEY_SIZE);
if (resp) {
sendZeroHop(resp, getRetransmitDelay(resp)*4); // apply random delay (widened x4), as multiple nodes can respond to this
}