From cc2ef851c7dd0d3ce9e16f7a2104d8e9ffa2ab5e Mon Sep 17 00:00:00 2001 From: Jan-Philipp Litza Date: Thu, 16 Jan 2014 22:36:09 +0100 Subject: [PATCH] alfred: add random node-specific delay before sending --- package/gluon-alfred/files/lib/gluon/alfred/announce.sh | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/package/gluon-alfred/files/lib/gluon/alfred/announce.sh b/package/gluon-alfred/files/lib/gluon/alfred/announce.sh index c4f88c61..928cee8f 100755 --- a/package/gluon-alfred/files/lib/gluon/alfred/announce.sh +++ b/package/gluon-alfred/files/lib/gluon/alfred/announce.sh @@ -15,9 +15,17 @@ fi # set defaults [ -z "$ALFRED_DATA_TYPE" ] && ALFRED_DATA_TYPE=158 [ -z "$NET_IF" ] && NET_IF=br-client +[ -z "$MAX_WAIT" ] && MAX_WAIT=300 set -e +# To avoid mass flooding the network every five minutes with all clients +# simultaneously, wait for a random time between 0 and 300 seconds, but fixed +# for each device to maintain 5 minutes between updates. +# Calculated using first 3 hex digits of the primary MAC address' MD5 hash +DELAY=$((0x$(sysconfig primary_mac | tr -d ':' | md5sum | head -c3) * $MAX_WAIT / (16**3))) +sleep $DELAY + json_init json_add_string "hostname" "$(uci get 'system.@system[0].hostname')"