See documentation for Standby Apps
Before accessing any developer features, your Double 3 will need to be put into developer mode.
Open the Developer Monitor of your D3 in Chrome on your computer by visiting: http://YOUR_D3_IP:8080. You can find your D3's local IP by tapping the WiFi icon on the default standby screen.
Upload the files from this example to a web server or launch a web server on your local computer. You can do that easily in a terminal by changing to this repository directory and running a static web server, such as:
python 2:
python -m SimpleHTTPServer 8000
or python 3:
python -m http.server 8000
Type the address of your web server (http://YOUR_COMPUTER_IP:8000/) into the Standby GUI input field and click the "Go" button.
