Mikrotik script for send message to Slack on IP change

slackIPChangeInfo.rsc

:global ipCurrent "$ipCurrent";

{
# Change to your settings
# -----------------------
:local wanInterface "eth1";
:local slackHookUrl "https://hooks.slack.com/services/YOUR/APP/SECRET";
# -----------------------

:local ipNew [/ip address get [find interface=$wanInterface] address];
:local ipNewF [:pick $ipNew 0 ([:len $ipNew]-3)];
:local ipCurrentF [:pick $ipCurrent 0 ([:len $ipCurrent]-3)];
:local dataForMsg "{\"text\":\"IP change detected.\n$ipCurrentF --> $ipNewF\"}";

:if ($ipNew != $ipCurrent) do={
  :set ipCurrent $ipNew;  
  /tool fetch http-data=$dataForMsg url=$slackHookUrl;
}
}