Use APKPure App
Get Wi-Fi Webcam old version APK for Android
Webcam use WiFi without network.
Other phone can watching screen for another phone's camera.
The app do not use the internet. All devices must install this app.
Range :
From the cellphone in the center of building Server to others receiving WiFi.
Restriction :
When the user of building Server chooses to quit, all users joining will be forced to close Server.