From 564d4592a12c61d5df32e00b4bb2bef24afb768f 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 | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/examples/simple_room_server/MyMesh.cpp b/examples/simple_room_server/MyMesh.cpp index 7b943773..24de5b12 100644 --- a/examples/simple_room_server/MyMesh.cpp +++ b/examples/simple_room_server/MyMesh.cpp @@ -282,7 +282,16 @@ 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; + if (packet->isRouteFlood() && packet->path_len >= _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; }