There are files like lmc_1477919175480.log being created under C:\Users\<user>\AppData\Local\LAN Messenger\LAN Messenger\logs spanning up to several MB each, which accumulate and waste more than 40MB every year on a single setup with a casual usage of 2 computers, so I can't even imagine how much spam does this cause in real scenarios. Files contain content like this:

[2017.01.15 23:39:49] Refreshing contacts list...
[2017.01.15 23:39:49] Sending broadcast type 1
[2017.01.15 23:39:49] Sending UDP datagram to 239.255.100.100:50000
[2017.01.15 23:39:49] Sending UDP datagram to 192.168.56.255:50000
[2017.01.15 23:39:49] Broadcast sending done
[2017.01.15 23:39:49] UDP datagram received from 192.168.56.1
[2017.01.15 23:39:49] UDP datagram received from 192.168.56.1

This should be disabled by default along with some way to periodically clean this up.