From bd4c4cf69d391c65dfd186ed99ae7985e7ee7caf Mon Sep 17 00:00:00 2001 From: Matthias Wientapper Date: Wed, 7 Jan 2026 21:24:25 +0100 Subject: [PATCH] Limit flood advert packet forwarding, implements #1223 --- examples/simple_repeater/MyMesh.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/examples/simple_repeater/MyMesh.cpp b/examples/simple_repeater/MyMesh.cpp index b838bdcb..61e28da6 100644 --- a/examples/simple_repeater/MyMesh.cpp +++ b/examples/simple_repeater/MyMesh.cpp @@ -390,6 +390,14 @@ bool MyMesh::allowPacketForward(const mesh::Packet *packet) { MESH_DEBUG_PRINTLN("allowPacketForward: unknown transport code, or wildcard not allowed for FLOOD packet"); 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; }