diff --git a/docs/about/overview/mesh-alg.mdx b/docs/about/overview/mesh-alg.mdx index 73e1e42a..da4eee8f 100644 --- a/docs/about/overview/mesh-alg.mdx +++ b/docs/about/overview/mesh-alg.mdx @@ -91,3 +91,25 @@ After node 0 received this rebroadcast, its message is acknowledged. Note that a Since node 1 heard the rebroadcast by 2, it will not rebroadcast again. Node 3 heard the message for the first time and the HopLimit is not yet zero, so it starts a rebroadcast for potential other receivers. ![Mesh algorithm example](/img/SNR_based_flooding.webp) + +### Regular Broadcast Intervals + +Without additional modules configured, nodes will produce three different types of regularly intervaled traffic as part of the mesh: + +1. Device Telemetry + - Controlled by `telemetry.device_update_interval` + - Default: 30 minutes +2. Position + - Controlled by `position.position_broadcast_secs` + - Default: 15 minutes* (with [smart broadcast](/docs/configuration/radio/position/#smart-broadcast) enabled) +3. NodeInfo user + - Controlled by `device.node_info_broadcast_secs` + - Default: 3 hours + +As meshes grow larger and traffic becomes more contentious, the firmware will increase these intervals. This is in addition to duty cycle, channel, and air-time utilization throttling. + +Starting with version 2.4.0, the firmware will scale back Telemetry, Position, and other ancillary port traffic for meshes larger than 40 nodes (nodes seen in the past 2 hours) using the following algorithm: + +`ScaledInterval = Interval * (1.0 + ((NumberOfOnlineNodes - 40) * 0.075)))` + +For example an active mesh of 62 nodes would scale back `telemetry.device_update_interval` to 79.5 minutes instead of the 30 minute default.