Teaching WIKI
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====== VNC Configuration ======

VNC stands for **Virtual Network Computing**, it is a graphical desktop sharing system that uses the Remote Frame Buffer (RFB) protocol which allows you to control a remote computer through a network connection, capturing keyboard and mouse events and updating the graphical window on both computers by retransmitting the changes through a network.

===== Hardware Setup =====

{{:workshops:nvidia_jetson:xavier_nx:setup_remote_desktop.jpg?nolink&600|(Insert image here)
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Be sure to connect the following peripherals:
  * Mouse
  * Keyboard
  * Screen (using an HDMI cable)
  * Power Plug (of course)

Turn on the Jetson Xavier NX by pressing the **POWER** button.

Depending on the configuration at the time of installing the operating system, a login screen will appear, or it will automatically log in and skip this.

Once the operating system is ready open the terminal by pressing the key combination **''Ctrl + Alt + T''**, or use the applications menu and search for //Terminal//.

===== Installing the VNC Server =====

Make sure all packages are up to date by running the command

<code>sudo apt-get update</code>

Install **Vino** which is the **VNC server** for the **GNOME** desktop environment.

<code>sudo apt-get install vino</code>

===== Enabling the VNC Server =====

Now it is necessary to enable the automatic start of VNC Server each time you log in to the operating system, to do this run the command

<code>mkdir -p ~/.config/autostart && cp /usr/share/applications/vino-server.desktop ~/.config/autostart</code>

Configure the VNC server

<code>gsettings set org.gnome.Vino prompt-enabled false && gsettings set org.gnome.Vino require-encryption false && gsettings set org.gnome.Vino authentication-methods "['vnc']" </code>

In the following command replace **''yourpassword''** with your desired password. 

> Note this will be the password needed to remotely connect to the VNC Server and does not necessarily have to be the same as your ''root'' user.

<code>gsettings set org.gnome.Vino vnc-password $(echo -n 'yourpassword'|base64)</code>

===== Setup the Desktop Resolution =====

The desktop resolution is determined depending on the capabilities of the display connected to the Jetson, but if there is no display connected the default resolution is ''640x480'', which is not very comfortable for remote working. This default resolution can be changed by editing the ''xorg.conf'' file, to open it type the following command in the terminal.

<code>sudo gedit /etc/X11/xorg.conf</code>

It will ask you for the user's password and then display the information contained in the file ''xorg.conf'', at the end of the file add the following lines:

<code>Section "Screen"
   Identifier    "Default Screen"
   Monitor       "Configured Monitor"
   Device        "Tegra0"
   SubSection "Display"
       Depth    24
       Virtual 1280 800 # Modify the resolution by editing these values
   EndSubSection
EndSection</code>

You can adjust the resolution to your needs by changing the values in the **SubSection "Display"** in the parameter **Virtual**.

> Note: Do not change the format of the values, do not write things like ''1280x800'', ''1280px 800px'' or any other combination and keep in mind that the first value is the **width** and the second is the **height**.

**Do not forget to save the changes to the file!**.


===== Preparing to connect the VNC Server =====

**(Remains in the Jetson desktop environment)**

Make sure you have automatic login enabled so that the VNC Server can start automatically.

If this is not the case, you can activate it this way:

In the upper right part of the screen click on the icon shown in the image.

{{:workshops:nvidia_jetson:xavier_nx:vnc-server-1.jpg?nolink&600|}}

Open the system settings.

{{:workshops:nvidia_jetson:xavier_nx:vnc-server-2.jpg?nolink&600|}}

User Accounts

{{:workshops:nvidia_jetson:xavier_nx:vnc-server-3.jpg?nolink&600|}}

Unlock the change of settings by pressing the **Unlock** button.

{{:workshops:nvidia_jetson:xavier_nx:vnc-server-4.jpg?nolink&600|}}

Authenticate with your password

{{:workshops:nvidia_jetson:xavier_nx:vnc-server-5.jpg?nolink&600|}}

Enable the **Automatic Login** option.

{{:workshops:nvidia_jetson:xavier_nx:vnc-server-6.jpg?nolink&600|}}

Finally you need the IP address of the system to know it, type in the terminal.

<code>ifconfig</code>

If you will use the remote connection via wifi look for the **wlan0** section and the sequence of numbers after the text **inet**, for example **inet 192.168.56.98**. In case of using it by ethernet look for the **eth0** section, or by usb **usb0**.

This **IP address** and the previously configured **password** will be the necessary data to perform the remote connection.

To complete the process, restart Jetson by typing in the terminal.

<code>sudo reboot</code>

**Now your Jetson is ready to connect to the desktop remotely!**

===== Remote Connection =====

To connect remotely you can use any VNC Client of your choice. Some examples are

    * [[https://www.tightvnc.com/|TightVNC]]
    * [[https://remmina.org/|Remmina]]
    * [[http://xrdp.org/|xrdp]]
    * [[http://www.karlrunge.com/x11vnc/|x11vnc]]
    * [[https://wiki.gnome.org/action/show/Vinagre?action=show&redirect=Apps%2FVinagre|Vinagre]]
    * [[https://www.tightvnc.com/vncviewer.1.php|vncviewer]]
    * [[https://github.com/novnc/noVNC|noVNC]]

The VNC Client will ask for the **IP** and **password** and if everything is correct it will successfully connect to our Jetson.

> **IMPORTANT NOTE: Make sure that the Jetson and the remote computer are connected to the same network, otherwise it will not work.**