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Feature: Seamless Cross-Preset Communication via UDP Multicast Bridging (#7753)

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* Added compatibility between nodes on different Presets through `Mesh via UDP`

* Optimize multicast handling and channel mapping

- FloodingRouter: remove redundant UDP-encrypted rebroadcast suppression.
- Router: guard multicast fallback with HAS_UDP_MULTICAST and map fallback-decoded packets
  to the local default channel via isDefaultChannel()
- UdpMulticastHandler: set transport_mechanism only after successful decode

* trunk fmt

* Move setting transport mechanism.

---------

Co-authored-by: GUVWAF <thijs@havinga.eu>
This commit is contained in:
Michael
2025-09-16 02:29:47 +02:00
committed by GitHub
parent 09de0e3edb
commit b9d53d667e
5 changed files with 66 additions and 9 deletions
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30
src/mesh/Router.cpp
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@@ -430,6 +430,36 @@ DecodeState perhapsDecode(meshtastic_MeshPacket *p)
}
}
}
#if HAS_UDP_MULTICAST
// Fallback: for UDP multicast, try default preset names with default PSK if normal channel match failed
if (!decrypted && p->transport_mechanism == meshtastic_MeshPacket_TransportMechanism_TRANSPORT_MULTICAST_UDP) {
if (channels.setDefaultPresetCryptoForHash(p->channel)) {
memcpy(bytes, p->encrypted.bytes, rawSize);
crypto->decrypt(p->from, p->id, rawSize, bytes);
meshtastic_Data decodedtmp;
memset(&decodedtmp, 0, sizeof(decodedtmp));
if (pb_decode_from_bytes(bytes, rawSize, &meshtastic_Data_msg, &decodedtmp) &&
decodedtmp.portnum != meshtastic_PortNum_UNKNOWN_APP) {
p->decoded = decodedtmp;
p->which_payload_variant = meshtastic_MeshPacket_decoded_tag;
// Map to our local default channel index (name+PSK default), not necessarily primary
ChannelIndex defaultIndex = channels.getPrimaryIndex();
for (ChannelIndex i = 0; i < channels.getNumChannels(); ++i) {
if (channels.isDefaultChannel(i)) {
defaultIndex = i;
break;
}
}
chIndex = defaultIndex;
decrypted = true;
} else {
LOG_WARN("UDP fallback decode attempted but failed for hash 0x%x", p->channel);
}
}
}
#endif
if (decrypted) {
// parsing was successful
p->channel = chIndex; // change to store the index instead of the hash