Not receving frames when using physical mobile device

[CodeBreakerSL]

Thank you for your code.

i use emulater for this process it sucessfully woking. i add url for that like this 'http://10.0.2.2:8080/offer'

but when i run this in physical device i use this my local machine ip address 'http://192.168.1.188:8080/offer' . after run camera permisson ask and i gave it then camera idicators are dispying but camera not preview. in degub console show following details

I/org.webrtc.Logging( 7275): CameraStatistics: Camera fps: 17.
I/org.webrtc.Logging( 7275): EglRenderer: Duration: 4004 ms. Frames received: 0. Dropped: 0. Rendered: 0. Render fps: .0. Average render time: NA. Average swapBuffer time: NA.

it only not woking in physical mobile devices. why is that ?