From 26a004a89bf8f59f61ba2dd5c6a1aaff2d9220b0 Mon Sep 17 00:00:00 2001 From: Matthias Wientapper Date: Fri, 9 Jan 2026 20:47:09 +0100 Subject: [PATCH] Limit flood advert packet forwarding for roomservers as well --- examples/simple_room_server/MyMesh.cpp | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/examples/simple_room_server/MyMesh.cpp b/examples/simple_room_server/MyMesh.cpp index 5451505a..1e2e763f 100644 --- a/examples/simple_room_server/MyMesh.cpp +++ b/examples/simple_room_server/MyMesh.cpp @@ -277,6 +277,15 @@ uint32_t MyMesh::getDirectRetransmitDelay(const mesh::Packet *packet) { bool MyMesh::allowPacketForward(const mesh::Packet *packet) { if (_prefs.disable_fwd) return false; if (packet->isRouteFlood() && packet->getPathHashCount() >= _prefs.flood_max) return false; + + // Limit flood advert paket forwarding using a probabilistic reduction defined by P(h) = 0.308^(hops-1) + // https://github.com/meshcore-dev/MeshCore/issues/1223 + double_t roll_dice = (double)rand() / RAND_MAX; + double_t forw_prob = pow(0.308, packet->path_len - 1); + if (packet->getPayloadType() == PAYLOAD_TYPE_ADVERT && packet->isRouteFlood() && roll_dice > forw_prob) + return false; + + // all other packets return true; }