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gluon-ssid-changer

This branch of the script contains the ssid-changer version for the gluon branches 2018.1.x and newer. For older releases of Gluon use the branches "2017.1.x" and "2016.2.x".

This package adds a script to change the SSID when there is no connection to any gateway. This Offline-SSID can be generated from the first and last part of the node's name or from the MAC address allowing observers to recognize which node does not have a connection to a gateway. This script is called once every minute by micrond. It will change the SSID to the Offline-SSID after the node had no gateway-connectivity for several consecutive checks. As soon as the gateway-connectivity is back it toggles back to the original SSID.

You can enable/disable it in the config mode.

It checks if a gateway is reachable in an interval. Different algorithms can be selected to determine whether a gateway is assumed reachable:

  • tq_limit_enabled=true: (not working with BATMAN_V) define an upper and lower bound to toggle the SSID. As long as the TQ stays in-between those bounds the SSID will not be changed.

  • tq_limit_enabled=false: there will be only checked, if the gateway is reachable with:

    batctl gwl -H

The SSID is always changed back to normal every minute as soon as the gateway-connectivity is back.

The parameter switch_timeframe defines how long it will record the gateway-connectivity. Only if the gateway is not reachable during at least half the checks within switch_timeframe minutes, the SSID will be changed to "FF_Offline_$node_hostname" (or _$node_mac)

The parameter first defines a learning phase after reboot (in minutes) during which the SSID may be changed to the Offline-SSID every minute.

site.conf

Adapt and add this block to your site.conf:

ssid_changer = {
  enabled = true,
  switch_timeframe = 30,    -- only once every timeframe (in minutes) the SSID will change to the Offline-SSID
                            -- set to 1440 to change once a day
                            -- set to 1 minute to change every time the router gets offline
  first = 5,                -- the first few minutes directly after reboot within which an Offline-SSID may be
                            -- activated every minute (must be <= switch_timeframe)
  prefix = 'FF_Offline_',   -- use something short to leave space for the nodename (no '~' allowed!)
  suffix = 'nodename',      -- generate the SSID with either 'nodename', 'mac' or to use only the prefix: 'none'

  tq_limit_enabled = false, -- if false, the offline SSID will only be set if there is no gateway reacheable
                            -- if true, set upper and lower limit to turn the offline_ssid on and off
                            -- in-between these two values the SSID will never be changed to prevent it from
                            -- toggeling every minute:
  tq_limit_max = 45,        -- upper limit, above that the online SSID will be used
  tq_limit_min = 35         -- lower limit, below that the offline SSID will be used
},

Commandline options

You can configure the ssid-changer on the commandline with uci, for example disable it with:

uci set ssid-changer.settings.enabled='0'

Or set the timeframe to every three minutes with

uci set ssid-changer.settings.switch_timeframe='3'
uci set ssid-changer.settings.first='3'

Manual installation

If you don't have ssid-changer in your firmware, you can still install it manually on a node and set the desired settings that should differ from default:

ROUTER_IP='your:node::ip6'
LOGIN="root@[$ROUTER_IP]"
git clone https://github.com/Freifunk-Nord/gluon-ssid-changer.git ssid-changer
cd ssid-changer/gluon-ssid-changer/
scp -r files/* $LOGIN:/
scp luasrc/lib/gluon/upgrade/500-ssid-changer $LOGIN:/lib/gluon/upgrade/
ssh $ROUTER_IP "/lib/gluon/upgrade/500-ssid-changer;" \
  "uci set ssid-changer.settings.switch_timeframe='3';" \
  "uci set ssid-changer.settings.first='3';" \
  "uci commit ssid-changer;" \
  "uci show ssid-changer;" \
  "/etc/init.d/micrond reload;"

Alternative: gluon-ssid-notifier

If you just need the Offline-SSID for administrative purposes, there is a better solution, that will just add an extra SSID if a node is offline: https://github.com/freifunk-kiel/gluon-ssid-notifier/

Implement this package in your firmware

Create a file "modules" with the following content in your site directory:

GLUON_SITE_FEEDS="ssidchanger"
PACKAGES_SSIDCHANGER_REPO=https://github.com/freifunk-nord/gluon-ssid-changer.git
PACKAGES_SSIDCHANGER_COMMIT=f6db033d6568ea27805c9694b20085b8dec5ba87 # <-- set the newest commit ID here
PACKAGES_SSIDCHANGER_BRANCH=2018.1.x

With this done you can add the package gluon-ssid-changer to your site.mk

History

This is a merge of https://github.com/ffac/gluon-ssid-changer and https://github.com/viisauksena/gluon-ssid-changer that doesn't check the tx value any more. It is now in use in:

  • Freifunk Aachen
  • Freifunk Frankfurt am Main
  • Freifunk Kiel
  • Freifunk Kreis Gütersloh
  • Freifunk Nord
  • Eulenfunk
  • Freifunk Vogtland