This howto describes how to install Phoscon DeCONZ software using minimal installation. Everything is done as the root user in this howto.

Download Raspbian Buster Lite edition at: https://www.raspberrypi.org/downloads/raspbian/ Use Etcher or whatever to install the downloaded zip on a SD card.

Use raspi-config to set network and change password of the pi user and change the hostname:

raspi-config

systemctl enable ssh.service
systemctl start ssh.service

/etc/systemd/timesyncd.conf

[Time]
NTP=172.16.0.254
#FallbackNTP=0.debian.pool.ntp.org 1.debian.pool.ntp.org 2.debian.pool.ntp.org 3.debian.pool.ntp.org
#RootDistanceMaxSec=5
#PollIntervalMinSec=32
#PollIntervalMaxSec=2048

apt install \
  curl \
  kmod \
  libcap2-bin \
  libqt5core5a \
  libqt5gui5 \
  libqt5network5 \
  libqt5serialport5 \
  libqt5sql5 \
  libqt5websockets5 \
  libqt5widgets5 \
  lsof \
  sqlite3 \
  tigervnc-standalone-server \
  tigervnc-common \
  wmii \
  xfonts-base \
  xfonts-scalable

/etc/systemd/system/vncserver@:0.service

# Vncserver service file for Debian or Ubuntu with systemd
#
# 1. Copy this file to /etc/systemd/system/vncserver@:1.service
# 2. Edit User=
#    e.g "User=paul"
# 3. Edit the vncserver parameters appropriately in the ExecStart= line!
#    e.g. the -localhost option only allows connections from localhost (or via ssh tunnels)
# 4. Run `systemctl daemon-reload`
# 5. Run `systemctl enable vncserver@:<display>.service`
#

[Unit]
Description=Remote desktop service (VNC)
After=syslog.target network.target

[Service]
Type=forking
User=pi

# Clean any existing files in /tmp/.X11-unix environment
ExecStartPre=/bin/sh -c '/usr/bin/tigervncserver -kill %i > /dev/null 2>&1 || :'
ExecStart=/usr/bin/tigervncserver -SecurityTypes VncAuth,TLSVnc %i
ExecStop=/usr/bin/tigervncserver -kill %i

[Install]
WantedBy=multi-user.target

/etc/X11/Xvnc-session

.
.
-- vncconfig -iconic &
++ vncconfig -nowin &
.
.

As user pi

tigervncpasswd

This creates a .vnc directory in the homedir of user pi with a passwd file in it. This is mandatory for the daemon to load.

systemctl daemon-reload
systemctl start vncserver@\:0.service
systemctl enable vncserver@\:0.service

Check with a VNC client if you can connect to the VNC server.

wget -O - http://phoscon.de/apt/deconz.pub.key | \
  apt-key add -

sh -c "echo 'deb http://phoscon.de/apt/deconz \
  $(lsb_release -cs) main' > \
  /etc/apt/sources.list.d/deconz.list"

apt update
apt install deconz

systemctl enable deconz-gui
systemctl start deconz-gui