Hi,
I don't know if this has been posted before, but there is a partial solution for those who cannot connect via the IP address over 3G/4G, because their provider is blocking it, and connecting through webkey.cc does not work.
I do not mean to provide a fully tested solution, but just a hint for people trying to stream the rooted Android device screen to another Android device.
What I did requires at least two Android devices : one rooted (the streaming device), let's call it A, and one not necessarily, let's call it B. B must have a 3G/4G connection available.
Want I did is to share my device B's 3G/4G connection over wifi, (I used FoxFi Key, but normally it is a build in function), and connect to it with device A.
Therefore, device A has a local IP address, and I was able to stream Device A screen to device B using webkey to stream on A and webkey to connect to remote screen on B.
Although this solution still requires a 3G/4G connection, it enables the connection in an environment where there is not external Wifi connection.
I have yet to test it in situ to test the performance, regarding the maximum distance between the two devices essentially.
Hope this is not a repost, but I didn't feel like browsing the 37 pages to make sure of it