Are you an angel?
Thank you for your kind answers.
Please take a look at the picture of the hardware.
The Wi-Fi module constitutes the network and the smart phone is connected.
(picture)The current IP address is the IP address given on the actual network.
(source code result : )
Smartphone Android version 6.0 ~ 8.0: 192.168.4.2
Smartphone Android version 9.0: 192.0.0.5
The cause of the phenomenon seems to be the phenomenon after updating the Android version.
I would like to know IP address(smartphone) at the moment. Is there a way?