Den Log kannst Du in der mg_cfg einstellen:

# Log option, summ of:
# 00 off
# 01 network udp log
# 02 log to console
# 04 file, appended ! delete it by yourself, before it eat all your hdd
# + IP udp-port log-file-name
L: { 04 } 192.168.1.23 8024 /tmp/mgcamd.log