Ethernet to Serial Communications Module with Android board

I am trying connect my Relay Controller 2-Channel General Purpose SPDT + 8 Channel ADC ProXR Lite with Android board using Ethernet to Serial Communications Module – New Gen 3.
After connecting the relay board with Android using Ethernet cable , I am bale to see it detected by the IO TCP relay android app running on my android board but when I tried click on it, it giving me the below error
No network connection.

Can anyone please help me on how to connect my relay with Android board.
Thanks