How to manually adjust Spreading Factor, and should I?

Ganesh_SR · August 24, 2022, 2:53pm

Hi ,

We are trying to adjust Spreading Factor manually. Is it possible?. How can we manually adjust the Spreading Factor of our node from SF8 to SF12 and wise-versa. Can we adjust through Chirpstack?. Please provide some example on this topic.

Thank You!

brocaar · August 30, 2022, 3:34pm

Please note that you can implement your own ADR algorithm plugin which could do exactly this That would at least be the easiest option to implement this.

Ganesh_SR · September 1, 2022, 4:31am

Thank you for your response. Could you please provide any example for our reference.
Thank You!

brocaar · September 10, 2022, 12:01pm

For ChirpStack v4:

github.com

chirpstack/chirpstack/blob/master/examples/adr_plugins/plugin_skeleton.js

// This must return the name of the ADR algorithm.
export function name() {
  return "Example plugin";
}

// This must return the id of the ADR algorithm.
export function id() {
  return "example_id";
}

// This handles the ADR request.
//
// Input object example:
// {
//  regionName: "eu868",
//  regionCommonName: "EU868",
//  devEui: "0102030405060708",
//  macVersion: "1.0.3",
//  regParamsRevision: "A",
//  adr: true,

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For ChirpStack v3:

github.com

brocaar/chirpstack-network-server/blob/master/examples/adr-plugin/main.go

package main

import (
	"github.com/hashicorp/go-plugin"
	log "github.com/sirupsen/logrus"

	"github.com/brocaar/chirpstack-network-server/v3/adr"
)

// Type Handler is the ADR handler.
type Handler struct{}

// ID must return the plugin identifier.
func (h *Handler) ID() (string, error) {
	return "example_plugin", nil
}

// Name must return a human-readable name.
func (h *Handler) Name() (string, error) {
	return "Example ADR plugin", nil

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Ganesh_SR · September 14, 2022, 6:16am

Thank you for your response. Is it possible to modify spreading factor in OTAA (Over the Air Activation) for each sensor? @brocaar