Can't communicate with more than 1 device on LG Gateway at the same time.
Updated with solution on 12/15/2017
Firmware version: 1.11.4
The gateway can only provide one source address when there are multiple device IDs. The wireshark capture confirmed that no unique source ID provided by the gateway with different device IDs.
Update the firmware version to 5.08.1h
Configure the "BACnet Type Setting" to "B Type".