Can we utilize BT110’s two network interfaces to achieve higher network connection reliability?

Yes.  When both the Ethernet interface and the WiFi interface are available, the BT110 uses the Ethernet interface as its master interface, and the WiFi interface will be standing by.  When the Ethernet connectivity becomes unavailable, the WiFi interface becomes the master interface.  Upon the Ethernet interface becomes available again, it becomes the primary interface and the WiFi goes back to be standing by. 

Note, however, that when switching the interfaces, there will be IP address changes and will require the device to re-establish its connection to the AVS server, the ACM server, and the SIP Telephony proxy/server.  This process may take up to 1 minute to complete, during which the device may not be able to accept voice commands and any active calls during the network transition may be dropped. 

Also note that if the Mobile App and the Tablet Controller need to be in the same subnet as the BT device.  Therefore, if the BT device Ethernet interface and the WiFi interface are connected to two different subnets, the Mobile App and the Tablet Controller can only communicate to the BT device when the network to which the interface is connected to is the same as that of the Mobile App and the Tablet Controller.