The E-sse application needs to have support for remote CCTV cameras. You need to configure the DVR for remote monitoring. This can be enabled by accessing its settings. Most of the DVRs have built-in help manuals to help you with this operation. First configure the DVR and make sure it gets a public IP address and note it down. Same goes for the port as well. Then open your Android phone, load the application and configure it using the IP, port, username, password, etc., and it should work.