Browser timeout from the NVR Web Access plagued me for a long time but I found a solution.
It requires some explanation. Usually the browser times out if you're not clicking on it at least every 10 minutes or so.
The solution is to run a little script in your browser console that keeps the connection active.
tl;dr this is the script for those who can interpret such things:
setInterval(function(){
document.getElementById('tbtext-1036').click();
}, 30000);
alternatively
setInterval(function(){
document.querySelector('#tbtext-1036').click();
}, 30000);
30000 = number of milliseconds. You can change this if you want.
EXPLANATION
FIRST
Log in to the NVR with the browser using your name and password and go to Live View.
You need a "click" in the browser but a click that doesn't do anything. So you need to find a non-clickable element.
I chose the date/time string in the upper right corner.
You need the ID of this element for the script. To get it, right-click on the date/time and choose "Inspect" or "Inspect element" (should work in most browsers). The "Developer Options" window will open and the code for this element will be highlighted there. In Chrome and Opera you might have to do it twice so it goes to the right place.
Mine looks like this: <div id=tbtext-1036 ... etc.
But any non-clickable element should do.
In Firefox the ID is the first parameter of the "<div" element. In Chrome and Opera it is there but is positioned later in the list.
Your little script (see below) will make a click on this element, which will do nothing, but the click will keep the browser connection active.
SECOND
In the top menu of the Developer Options window select "Console". This opens a way to communicate with the browser. A bunch of gibberish will come up, but at the bottom there will be a little blank space.
Paste the code into there, hit Return, then close the window by clicking the "X" in the upper right.
You may get a security warning about pasting code that will ask you to type "allow pasting." Do that, then paste the code.
You will have to go through this every time you access the NVR in the browser. But for me it lasts all day long with no interruptions. If you refresh the browser you will have to paste the code again because the refresh clears the console.
CODE
Interpretation of the JavaScript code:
"setInterval(function)" means the function will run every specified number of milliseconds.
30,000 milliseconds is 30 seconds, so that's how often the element will be clicked.
"document.getElementById('tbtext-1036').click()"
This is pretty self-explanatory if you understand the above. We are looking for an element with the ID of "tbtext-1036". The script locates the element on the web page by its ID number and clicks it.
"document.querySelector('#tbtext-1036').click()"
A slightly different syntax but doing the same thing. The hash sign "#" is a shortcut for element ID.
Please let me know if it doesn't work for you and we can try to figure it out.
