• you need libVNCServer in the SDK, follow the instructions in the libVNCServer README

• Check out the code (if not done already)

git clone https://github.com/mer-qa/mervncserver.git

• Start the Sailfish OS SDK Qt-Creator and open the file mervncserver.pro

• In kit selection make sure you enable MerSDK-SailfishOS-armv7hl

• In the build settings (on the left side, the Sailfish OS icon above the play button) configure MerSDK-SailfishOS-armv7hl -> Release -> Deploy By Building An RPM Package

• In the Build menu choose Deploy All, the created RPM file can now be installed on the device

Systemd ensures that the VNC server is launched when a client connects to port 5900. So it's logs go into the systemd journal. To spare resources the VNC server just runs while clients are connected.

There is no authendication! So connections are just accepted from usb network. So e.g. on Jolla phone you have to enable developer mode and when asked choose "Developer mode", default ip address is then 192.168.2.15 to connect to with the VNC client.

If you want to run the server in the forground, to follow any output, you need to stop the systemd socket listener, see below.

For all these commands you must be user root.

To verify the systemd socket listener is active:

systemctl status vnc.socket

To restart the systemd socket listener:

systemctl restart vnc.socket

To stop the systemd socket listener:

systemctl stop vnc.socket

To start the systemd socket listener:

systemctl start vnc.socket

Follow log entries in the systemd journal, just for the VNC server:

journalctl -f -a /usr/bin/mervncserver

Verify if the server is running (just running/active when a client is connected):

systemctl status vnc.service