[Touch_Pete]

Actually 192.168.*.* is a not an internet routable address. It is used internally behind routers but cannot be reached on the internet. You need your external IP and then you need to ensure that the port used by this app is set to forward to your computer by the router. The reason it worked when you were close was probably because you were using wifi on the same internal network, but when you went out of range then you switched to your data plan and were on an external routable address and couldn't connect.