Initial revision

etc/janus/janus.plugin.videoroom.jcfg.fragment

+room-1001: {
+	description = "VNC 1 Camera"
+	publishers = 1
+	bitrate = 128000
+	fir_freq = 10
+	record = false
+}
+
+room-1002: {
+	description = "VNC 2 Camera"
+	publishers = 1
+	bitrate = 128000
+	fir_freq = 10
+	record = false
+}
+
+room-1003: {
+	description = "VNC 3 Camera"
+	publishers = 1
+	bitrate = 128000
+	fir_freq = 10
+	record = false
+}
+
+room-1004: {
+	description = "VNC 4 Camera"
+	publishers = 1
+	bitrate = 128000
+	fir_freq = 10
+	record = false
+}
+
+room-1005: {
+	description = "VNC 5 Camera"
+	publishers = 1
+	bitrate = 128000
+	fir_freq = 10
+	record = false
+}
+
+room-1006: {
+	description = "VNC 6 Camera"
+	publishers = 1
+	bitrate = 128000
+	fir_freq = 10
+	record = false
+}

etc/nginx/sites-available/fragment.conf

+server {
+
+    listen 443 ssl;
+    listen [::]:443 ssl;
+
+
+[...]
+
+
+    location /cgi-bin/ {
+       # https://www.howtoforge.com/serving-cgi-scripts-with-nginx-on-debian-squeeze-ubuntu-11.04-p3
+       # Disable gzip (it makes scripts feel slower since they have to complete
+       # before getting gzipped)
+       gzip off;
+       # Set the root to /usr/lib (inside this location this means that we are
+       # giving access to the files under /usr/lib/cgi-bin)
+       root /var/www/streaming;
+       # Fastcgi socket
+       fastcgi_pass unix:/var/run/fcgiwrap.socket;
+       # Fastcgi parameters, include the standard ones
+       include /etc/nginx/fastcgi_params;
+       # Adjust non standard parameters (SCRIPT_FILENAME)
+       fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
+     }
+
+    #ProxyPass /websock/1/ ws://localhost:6081/websockify
+    location ~ ^/websock/1/(.*) {
+      proxy_pass http://127.0.0.1:6081/websockify$1;
+      proxy_http_version 1.1;
+      proxy_set_header Upgrade $http_upgrade;
+      proxy_set_header Connection "Upgrade";
+      proxy_set_header Host $host;
+      proxy_read_timeout 3600s;
+      proxy_send_timeout 3600s;
+    }
+
+
+[...]
+
+
+    location ~ ^/websock/26/(.*) {
+      proxy_pass http://127.0.0.1:6106/websockify$1;
+      proxy_http_version 1.1;
+      proxy_set_header Upgrade $http_upgrade;
+      proxy_set_header Connection "Upgrade";
+      proxy_set_header Host $host;
+      proxy_read_timeout 3600s;
+      proxy_send_timeout 3600s;
+    }
+
+
+[...]
+
+
+    location ~ ^/socket.io/5005/ {
+      proxy_pass http://127.0.0.1:5005;
+      proxy_http_version 1.1;
+      proxy_set_header Upgrade $http_upgrade;
+      proxy_set_header Connection "Upgrade";
+      proxy_set_header Host $host;
+      proxy_read_timeout 3600s;
+      proxy_send_timeout 3600s;
+      proxy_redirect off;
+    }
+
+    location ~ ^/vnc.html?(.*) {
+      proxy_pass http://127.0.0.1:6081/vnc.html?$1;
+    }
+
+    location ~ /(app|core|include|utils|vendor)/(.*) {
+      proxy_pass http://127.0.0.1:6081/$1/$2;
+    }
+
+}

etc/pult/pult-1.conf

+bbb_url="https://bbb.cvh-server.de/b/pet-jxk-dch" 
+bbb_invitation="follow <a target="_blank" href=\"$bbb_url\">link</a> to $bbb_url"
+
+module vnc vnc port=5521 autostart nobuttons
+#module vnc-gast vnc invitation="connect to streaming.cvh-server.de:1"
+module bbb bbb-camera module_name="" url="$bbb_url" invitation="$bbb_invitation"

etc/pult/pult-6.conf

+#start_text="starten"
+#stop_text="stoppen"
+#hide_text="verbergen"
+#show_text="zeigen"
+#min_text="minimieren"
+#max_text="maximieren"
+
+bbb_url="https://bbb.cvh-server.de/b/pet-jxk-dch" 
+bbb_invitation="follow <a target=\"_blank\" href=\"$bbb_url\">this link</a> to $bbb_url"
+jm_url="https://meet.cvh-server.de/VNC6" 
+jm_invitation="follow <a target=\"_blank\" href=\"$jm_url\">this link</a> to $jm_url"
+janus_receiver_url="https://streaming.cvh-server.de/cvh-camera/camera-receiver.html?room=1006"
+janus_receiver_url_redundant="https://streaming.cvh-server.de/cvh-camera/camera-receiver.html?room=1005"
+janus_sender_url="https://streaming.cvh-server.de/cvh-camera/camera-sender.html?room=1006"
+janus_sender_url_redundant="https://streaming.cvh-server.de/cvh-camera/camera-sender.html?room=1005"
+janus_invitation="follow <a target=\"_blank\" href=\"$janus_sender_url\">this link</a> to $janus_sender_url"
+janus_invitation_redundant="follow <a target=\"_blank\" href=\"$janus_sender_url_redundant\">this link</a> to $janus_sender_url_redundant"
+om_url="https://openmeetings.cvh-server.de:5443/openmeetings/#room/24"
+om_invitation="follow <a target=\"_blank\" href=\"$om_url\">this link</a> to $om_url"
+upload_sender_url="https://streaming.cvh-server.de/cgi-bin/pult-upload-6.cgi"
+upload_invitation="follow <a target="_blank" href=\"$upload_sender_url\">this link</a> to $upload_sender_url"
+
+module vnc vnc module_name="VNC" listen=26 invitation="connect through SSH tunnel to port 5526"
+module vnc-gast vnc module_name="VNC Gast" invitation="connect to streaming.cvh-server.de:6"
+module bbb bbb-camera module_name="BBB-Kamera" url="$bbb_url" invitation="$bbb_invitation"
+module jm jm-camera module_name="JM-Kamera" url="$jm_url" invitation="$jm_invitation"
+camera_default_max_resolution="1024x768"
+module janus cvh-camera module_name="CVH-Kamera 6" url="$janus_receiver_url" persistent_invitation="$janus_invitation"
+module janus-r cvh-camera module_name="CVH-Kamera 5" camera_room="1005" url="$janus_receiver_url_redundant" persistent_invitation="$janus_invitation_redundant" min_geometry="480x360-0-360"
+module janus-d cvh-camera module_name="CVH-Kamera D" browser="false" direct="true" persistent_invitation="$janus_invitation"
+module om om-board module_name="OM-Tafel" url="$om_url" persistent_invitation="$om_invitation"
+module bbbb bbb-board module_name="BBB-Tafel" url="$bbb_url" persistent_invitation="$bbb_invitation" min_geometry="1440x810+0+0"
+module upload upload module_name="Upload" persistent_invitation="$upload_invitation"

etc/pult/pult.conf

+pultd_port="$((6070 + channel))"
+
+module_directory="/usr/local/lib/pult"
+run_directory="/usr/local/var/run/pult"
+upload_directory="/usr/local/var/spool/pult"
+
+default_resolution="1920x1080"
+camera_default_max_resolution="1024x768"
+
+#cert_file="/etc/letsencrypt/live/$(hostname -f)/fullchain.pem"
+#key_file="/etc/letsencrypt/live/$(hostname -f)/privkey.pem"
+cert_file="/etc/letsencrypt/live/meet.cvh-server.de/fullchain.pem"
+key_file="/etc/letsencrypt/live/meet.cvh-server.de/privkey.pem"

etc/systemd/system/cvh-camera@.service

+[Unit]
+Description = CVH Camera %i
+After = syslog.target network.target janus.target
+
+[Service]
+Type = simple
+User = pult
+ExecStart = /usr/local/sbin/cvh-camera %i
+
+[Install]
+WantedBy = multi-user.target

etc/systemd/system/novnc@.service

+[Unit]
+Description = noVNC service %i
+After=syslog.target network.target
+
+[Service]
+Type = simple
+User = novnc
+ExecStart = /usr/local/sbin/novnc %i
+
+[Install]
+WantedBy = multi-user.target

etc/systemd/system/pult@.service

+[Unit]
+Description = PULT ULTimate Learning/Teaching Tool %i
+After = syslog.target network.target vncserver@%i.target
+
+[Service]
+Type = simple
+User = pult
+ExecStart = /usr/local/sbin/pultd %i
+
+[Install]
+WantedBy = multi-user.target

etc/systemd/system/vncrepeater@.service

+[Unit]
+Description = VNC repeater %i
+After = syslog.target network.target vncserver@%i.target
+
+[Service]
+Type = simple
+User = pult
+ExecStart = /usr/local/sbin/vncrepeater %i
+
+[Install]
+WantedBy = multi-user.target

etc/systemd/system/vncserver@.service

+[Unit]
+Description = VNC server %i
+After = syslog.target network.target
+
+[Service]
+Type = forking
+User = pult
+ExecStart = /usr/local/sbin/vncserver start %i
+ExecStop = /usr/local/sbin/vncserver stop %i
+
+[Install]
+WantedBy = multi-user.target

lib/pult/bbb-board.daemon

+#!/bin/bash
+
+debug=true
+
+module_name="$1"
+channel="$2"
+
+. "/usr/local/etc/pult/pult.conf"
+. "/usr/local/lib/pult/pult.functions"
+
+pid_file="$run_directory/$module_name-$channel.pid"
+$debug && echo "$0[$channel]: pid_file = $pid_file" 1>&2
+
+module ()
+{
+  m="$1"
+  shift 2
+  if [ "$m" = "$module_name" ]; then
+    for opt in "$@"; do
+      $debug && echo "$0[$channel]: option: $opt" 1>&2
+      case "$opt" in
+        "url="*)
+          url="$(echo $opt | sed -e 's/^url=//')"
+          ;;
+      esac
+    done
+  fi
+}
+
+max_width=1920
+max_height=810
+
+. "/usr/local/etc/pult/pult-$channel.conf"
+
+$debug && echo "$0[$channel]: url = $url" 1>&2
+
+cleanup ()
+{
+  if [ -n "$(jobs -p)" ]; then
+    kill $(jobs -p)
+  fi
+}
+
+trap cleanup exit;
+
+if [ -z "$url" ]; then
+  echo "$0[$channel]: configuration error: missing URL" 1>&2
+  exit 1
+fi
+
+env python3 "$module_directory/bbb-board.py" "$url" &
+selenium_pid="$!"
+line=$(xwininfo -root -children | grep "bbb\.cvh-server\.de")
+while [ -z "$line" ]; do
+  sleep 0.1
+  line=$(xwininfo -root -children | grep "data:\|Datenschutz\|BigBlueButton")
+done
+windowid=$(echo $line | cut -d " " -f 1)
+xdotool set_window --name "Controlled by PULT" "$windowid"
+report_status "waiting" "$windowid" "$max_width" "$max_height"
+chromium_pid=$(xdotool getwindowpid "$windowid")
+$debug && echo "$0[$channel]: chromium_pid = $chromium_pid" 1>&2
+rm -rf "$pid_file"
+echo "$chromium_pid" > "$pid_file"
+wait "$selenium_pid"
+xdotool set_window --name "Controlled by PULT" "$windowid"
+report_status "running" "$windowid" "$max_width" "$max_height"

lib/pult/bbb-board.module

+#!/bin/bash
+
+debug=true
+
+module_name="$PULT_MODULE_NAME"
+channel="$PULT_CHANNEL"
+$debug && echo "$0[$channel]: $module_name $@" 1>&2
+
+. "/usr/local/etc/pult/pult.conf"
+
+pid_file="$run_directory/$module_name-$channel.pid"
+$debug && echo "$0[$channel]: pid_file = $pid_file" 1>&2
+
+cmd="$1"
+case "$cmd" in
+  start)
+    daemon="$(echo $0 | sed -e 's/\.module/.daemon/')"
+    "$daemon" "$module_name" "$channel" &
+    ;;
+  stop)
+    if [ -f "$pid_file" ]; then
+      pid=$(cat "$pid_file")
+      ppid=$(ps --no-headers -o "%P" "$pid")
+      kill "$pid" "$ppid" || true
+      rm -rf "$pid_file"
+    else
+      echo -e "$0[$channel]: stop: not running"
+    fi
+    ;;
+  defaults)
+    echo "min=false"
+    ;;
+  geometry)
+    $debug && echo "new geometry: ${2}x${3}+$4+$5" 1>&2
+    ;;
+  *)
+    echo -e "$0[$channel]: invalid command\"$@\""
+    ;;
+esac

lib/pult/bbb-board.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from time import sleep
+from sys import argv
+from selenium import webdriver
+from selenium.webdriver.chrome.options import Options  
+from selenium.common.exceptions import NoSuchElementException
+
+def find_element(xpath):
+    element = None
+    while not element:
+        try:
+            element = browser.find_element_by_xpath(xpath)
+        except NoSuchElementException:
+            sleep(1)
+            element = None
+    return element
+
+def click_element(xpath):
+    element = find_element(xpath)
+    success = False
+    while not success:
+        try:
+            element.click()
+            success = True
+        except:
+            sleep(1)
+
+options = Options()  
+options.add_argument('--disable-infobars') 
+options.add_argument('--no-sandbox') 
+options.add_argument('--kiosk') 
+options.add_argument('--window-size=1920,1080')
+options.add_argument('--window-position=0,0')
+options.add_experimental_option("excludeSwitches", ['enable-automation']);   
+options.add_argument('--shm-size=1gb') 
+options.add_argument('--disable-dev-shm-usage') 
+options.add_argument('--start-fullscreen') 
+
+browser = webdriver.Chrome(executable_path='chromedriver', options=options)
+browser.get (argv[1])
+
+find_element('//input[contains(@id,"_join_name")]').send_keys('VNC')
+find_element('//button[@id="room-join"]').click()
+browser.find_element_by_id('yes').click()
+click_element('//button[@aria-label="Close Join audio modal"]')
+click_element('//button[@aria-label="Make Presentation fullscreen"]')
+find_element('//div[contains(@class,"svgContainer")]')  # Just wait for it ...
+
+browser.execute_script('var divs = document.getElementsByTagName ("div"); '
+                     + 'var item; '
+                     + 'for (var i = 0, len = divs.length; i < len; i++) '
+                     + '  { '
+                     + '    item = divs[i]; '
+                     + '    if (item.className && item.className.indexOf ("svgContainer") == 0) '
+                     + '      item.style.marginRight = "480px"; '
+                     + '  } ')

lib/pult/bbb-camera.daemon

+#!/bin/bash
+
+debug=true
+
+module_name="$1"
+channel="$2"
+
+. "/usr/local/etc/pult/pult.conf"
+. "/usr/local/lib/pult/pult.functions"
+
+pid_file="$run_directory/$module_name-$channel.pid"
+$debug && echo "$0[$channel]: pid_file = $pid_file" 1>&2
+
+module ()
+{
+  m="$1"
+  shift 2
+  if [ "$m" = "$module_name" ]; then
+    for opt in "$@"; do
+      $debug && echo "$0[$channel]: option: $opt" 1>&2
+      case "$opt" in
+        "url="*)
+          url="$(echo $opt | sed -e 's/^url=//')"
+          ;;
+      esac
+    done
+  fi
+}
+
+max_width=$(echo "$camera_default_max_resolution" | cut -d "x" -f 1)
+max_height=$(echo "$camera_default_max_resolution" | cut -d "x" -f 2)
+
+. "/usr/local/etc/pult/pult-$channel.conf"
+
+$debug && echo "$0[$channel]: url = $url" 1>&2
+
+cleanup ()
+{
+  if [ -n "$(jobs -p)" ]; then
+    kill $(jobs -p)
+  fi
+}
+
+trap cleanup exit;
+
+if [ -z "$url" ]; then
+  echo "$0[$channel]: configuration error: missing URL" 1>&2
+  exit 1
+fi
+
+env python3 "$module_directory/bbb-camera.py" "$url" &
+selenium_pid="$!"
+line=$(xwininfo -root -children | grep "bbb\.cvh-server\.de")
+while [ -z "$line" ]; do
+  sleep 0.1
+  line=$(xwininfo -root -children | grep "data:\|Datenschutz\|BigBlueButton")
+done
+windowid=$(echo $line | cut -d " " -f 1)
+xdotool set_window --name "Controlled by PULT" "$windowid"
+report_status "waiting" "$windowid" "$max_width" "$max_height"
+chromium_pid=$(xdotool getwindowpid "$windowid")
+$debug && echo "$0[$channel]: chromium_pid = $chromium_pid" 1>&2
+rm -rf "$pid_file"
+echo "$chromium_pid" > "$pid_file"
+wait "$selenium_pid"
+xdotool set_window --name "Controlled by PULT" "$windowid"
+report_status "running" "$windowid" "$max_width" "$max_height"

lib/pult/bbb-camera.module

+#!/bin/bash
+
+debug=true
+
+module_name="$PULT_MODULE_NAME"
+channel="$PULT_CHANNEL"
+$debug && echo "$0[$channel]: $module_name $@" 1>&2
+
+. "/usr/local/etc/pult/pult.conf"
+
+pid_file="$run_directory/$module_name-$channel.pid"
+$debug && echo "$0[$channel]: pid_file = $pid_file" 1>&2
+
+cmd="$1"
+case "$cmd" in
+  start)
+    daemon="$(echo $0 | sed -e 's/\.module/.daemon/')"
+    "$daemon" "$module_name" "$channel" &
+    ;;
+  stop)
+    if [ -f "$pid_file" ]; then
+      pid=$(cat "$pid_file")
+      ppid=$(ps --no-headers -o "%P" "$pid")
+      kill "$pid" "$ppid" || true
+      rm -rf "$pid_file"
+    else
+      echo -e "$0[$channel]: stop: not running"
+    fi
+    ;;
+  defaults)
+    echo "min=true"
+    ;;
+  geometry)
+    $debug && echo "new geometry: ${2}x${3}+$4+$5" 1>&2
+    ;;
+  *)
+    echo -e "$0[$channel]: invalid command\"$@\""
+    ;;
+esac

lib/pult/bbb-camera.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from time import sleep
+from sys import argv
+from selenium import webdriver
+from selenium.webdriver.chrome.options import Options  
+from selenium.common.exceptions import NoSuchElementException
+
+def find_element(xpath):
+    element = None
+    while not element:
+        try:
+            element = browser.find_element_by_xpath(xpath)
+        except NoSuchElementException:
+            sleep(1)
+            element = None
+    return element
+
+def click_element(xpath):
+    element = find_element(xpath)
+    success = False
+    while not success:
+        try:
+            element.click()
+            success = True
+        except:
+            sleep(1)
+
+options = Options()  
+options.add_argument('--disable-infobars') 
+options.add_argument('--no-sandbox') 
+options.add_argument('--kiosk') 
+options.add_argument('--window-size=1920,1080')
+options.add_argument('--window-position=0,0')
+options.add_experimental_option("excludeSwitches", ['enable-automation']);   
+options.add_argument('--shm-size=1gb') 
+options.add_argument('--disable-dev-shm-usage') 
+options.add_argument('--start-fullscreen') 
+
+browser = webdriver.Chrome(executable_path='chromedriver', options=options)
+browser.get (argv[1])
+
+find_element('//input[contains(@id,"_join_name")]').send_keys('VNC')
+find_element('//button[@id="room-join"]').click()
+browser.find_element_by_id('yes').click()
+click_element('//button[@aria-label="Close Join audio modal"]')
+click_element('//div[@id="container"]//div[contains(@class,"videoContainer--")]//button')

lib/pult/cvh-camera.daemon

+#!/bin/bash
+
+debug=true
+
+module_name="$1"
+channel="$2"
+camera_room="$((1000 + channel))"
+browser=true
+direct=false
+
+. "/usr/local/etc/pult/pult.conf"
+. "/usr/local/lib/pult/pult.functions"
+
+pid_file="$run_directory/$module_name-$channel.pid"
+$debug && echo "$0[$channel]: pid_file = $pid_file" 1>&2
+
+module ()
+{
+  m="$1"
+  shift 2
+  if [ "$m" = "$module_name" ]; then
+    for opt in "$@"; do
+      $debug && echo "$0[$channel]: option: $opt" 1>&2
+      case "$opt" in
+        "url="*)
+          url="$(echo $opt | sed -e 's/^url=//')"
+          ;;
+        "camera_room="*)
+          camera_room="$(echo $opt | sed -e 's/^camera_room=//')"
+          ;;
+        "direct="*)
+          direct="$(echo $opt | sed -e 's/^direct=//')"
+          ;;
+        "browser="*)
+          browser="$(echo $opt | sed -e 's/^browser=//')"
+          ;;
+      esac
+    done
+  fi
+}
+
+max_width=$(echo "$camera_default_max_resolution" | cut -d "x" -f 1)
+max_height=$(echo "$camera_default_max_resolution" | cut -d "x" -f 2)
+
+. "/usr/local/etc/pult/pult-$channel.conf"
+
+$debug && echo "$0[$channel]: url = $url" 1>&2
+
+cleanup ()
+{
+  if [ -n "$(jobs -p)" ]; then
+    kill $(jobs -p)
+  fi
+}
+
+trap cleanup exit;
+
+if $browser; then
+
+  if [ -z "$url" ]; then
+    echo "$0[$channel]: configuration error: missing URL for browser" 1>&2
+    exit 1
+  fi
+
+  env python3 "$module_directory/cvh-camera.py" "$url" &
+  selenium_pid="$!"
+  line=$(xwininfo -root -children | grep "novnc\.cvh-server\.de")
+  $debug && echo "camera_room = $camera_room" 1>&2
+  while [ -z "$line" ]; do
+    sleep 0.1
+    line=$(xwininfo -root -children | grep "Camera Receiver $camera_room")
+  done
+  windowid=$(echo $line | cut -d " " -f 1)
+  chromium_pid=$(xdotool getwindowpid "$windowid")
+  $debug && echo "$0[$channel]: chromium_pid = $chromium_pid" 1>&2
+  rm -rf "$pid_file"
+  echo "$chromium_pid" > "$pid_file"
+  if wait "$selenium_pid"; then
+    report_status "running" "$windowid" "$max_width" "$max_height"
+  else
+    $debug && echo "start of $module_name interrupted" 1>&2
+  fi
+
+elif $direct; then
+
+  report_status "running" "NULL" "$max_width" "$max_height"
+
+else
+
+  echo "$0[$channel]: configuration error: neither browser nor direct" 1>&2
+  exit 1
+
+fi

lib/pult/cvh-camera.module

+#!/bin/bash
+
+debug=true
+
+module_name="$PULT_MODULE_NAME"
+channel="$PULT_CHANNEL"
+$debug && echo "$0[$channel]: $module_name $@" 1>&2
+
+camera_room="$((1000 + channel))"
+camera_server_port="$((5010 + channel))"
+
+. "/usr/local/etc/pult/pult.conf"
+
+direct=false
+
+module ()
+{
+  m="$1"
+  shift 2
+  if [ "$m" = "$module_name" ]; then
+    for opt in "$@"; do
+      $debug && echo "$0[$channel]: option: $opt" 1>&2
+      case "$opt" in
+        "camera_room="*)
+          camera_room="$(echo $opt | sed -e 's/^camera_room=//')"
+          ;;
+        "camera_server_port="*)
+          camera_server_port="$(echo $opt | sed -e 's/^camera_server_port=//')"
+          ;;
+        "direct="*)
+          direct="$(echo $opt | sed -e 's/^direct=//')"
+      esac
+    done
+  fi
+}
+
+. "/usr/local/etc/pult/pult-$channel.conf"
+$debug && echo "$0[$channel]: camera_room = $camera_room, camera_server_port = $camera_server_port" 1>&2
+
+pid_file="$run_directory/$module_name-$channel.pid"
+$debug && echo "$0[$channel]: pid_file = $pid_file" 1>&2
+
+cmd="$1"
+case "$cmd" in
+  start)
+    daemon="$(echo $0 | sed -e 's/\.module/.daemon/')"
+    "$daemon" "$module_name" "$channel" &
+    ;;
+  stop)
+    if $direct; then
+      $debug && echo "$0[$channel]: sending command to camera server: hide" 1>&2
+      echo "hide" | nc -q 0 localhost "$camera_server_port"
+    fi
+    if [ -f "$pid_file" ]; then
+      pid=$(cat "$pid_file")
+      ppid=$(ps --no-headers -o "%P" "$pid")
+      kill "$pid" "$ppid" || true
+      rm -rf "$pid_file"
+    else
+      echo -e "$0[$channel]: stop: not running"
+    fi
+    ;;
+  defaults)
+    echo "min=true browser=true direct=false"
+    ;;
+  geometry)
+    $debug && echo "new geometry: ${2}x${3}+$4+$5" 1>&2
+    if $direct; then
+      if [ "$2" = "hidden" ]; then
+        $debug && echo "$0[$channel]: sending command to camera server: hide" 1>&2
+        echo "hide" | nc -q 0 localhost "$camera_server_port"
+      else
+        $debug && echo "$0[$channel]: sending command to camera server: show" 1>&2
+        echo "show" | nc -q 0 localhost "$camera_server_port"
+        $debug && echo "$0[$channel]: sending command to camera server: set_geometry_relative_to_canvas lt $4 $5 $2 $3" 1>&2
+        echo "set_geometry_relative_to_canvas lt $4 $5 $2 $3" | nc -q 0 localhost "$camera_server_port"
+      fi
+    fi
+    ;;
+  *)
+    echo -e "$0[$channel]: invalid command\"$@\""
+    ;;
+esac

lib/pult/cvh-camera.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+from time import sleep
+from sys import argv
+from selenium import webdriver
+from selenium.webdriver.chrome.options import Options  
+from selenium.common.exceptions import NoSuchElementException
+
+def find_element(xpath):
+    element = None
+    while not element:
+        try:
+            element = browser.find_element_by_xpath(xpath)
+        except NoSuchElementException:
+            sleep(1)
+            element = None
+    return element
+
+options = Options()  
+options.add_argument('--disable-infobars') 
+options.add_argument('--no-sandbox') 
+options.add_argument('--kiosk') 
+options.add_argument('--window-size=1920,1080')
+options.add_argument('--window-position=0,0')
+options.add_experimental_option("excludeSwitches", ['enable-automation']);   
+options.add_argument('--shm-size=1gb') 
+options.add_argument('--disable-dev-shm-usage') 
+options.add_argument('--start-fullscreen') 
+
+browser = webdriver.Chrome(executable_path='chromedriver', options=options)
+browser.get (argv[1])
+
+sleep(1)
+
+# element = find_element('//button[@id="view"]')
+element = find_element('//button')
+success = False
+while not success:
+    try:
+        element.click()
+        success = True
+    except:
+        sleep(1)