Ethernet network adapter for testing purpose

[RedCarrottt]

As now, selective connection is difficult to test in real scenario.
It is because it only supports P2P communications such as Bluetooth and Wi-fi Direct.
However, P2P communication is prone to disconnect or fail in connection.
It makes testing more difficult.

On the other hand, Ethernet network adapter is adequate to test this project.
It is more stable than those P2P communications.

Therefore, Ethernet network adapter is required for the long-term maintenance.