Add cloud demo server.

demo-apps/cf-cloud-demo-server/pom.xml

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+<?xml version='1.0' encoding='UTF-8'?>
+<project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
+
+	<modelVersion>4.0.0</modelVersion>
+
+	<parent>
+		<groupId>org.eclipse.californium</groupId>
+		<artifactId>demo-apps</artifactId>
+		<version>3.12.0-SNAPSHOT</version>
+	</parent>
+	<artifactId>cf-cloud-demo-server</artifactId>
+	<packaging>jar</packaging>
+
+	<name>Cf-CloudDemoServer</name>
+	<description>Californium (Cf) Cloud Demo server</description>
+
+	<properties>
+		<assembly.mainClass>org.eclipse.californium.cloud.DemoServer</assembly.mainClass>
+		<skipNexusStagingDeployMojo>false</skipNexusStagingDeployMojo>
+		<skipStaging>false</skipStaging>
+		<maven.javadoc.skip>false</maven.javadoc.skip>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>${project.groupId}</groupId>
+			<artifactId>californium-core</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>${project.groupId}</groupId>
+			<artifactId>scandium</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>${project.groupId}</groupId>
+			<artifactId>cf-unix-health</artifactId>
+			<version>${project.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>info.picocli</groupId>
+			<artifactId>picocli</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>com.upokecenter</groupId>
+			<artifactId>cbor</artifactId>
+		</dependency>
+		<dependency>
+			<groupId>com.google.code.gson</groupId>
+			<artifactId>gson</artifactId>
+		</dependency>
+
+		<!-- runtime dependencies -->
+		<dependency>
+			<groupId>${project.groupId}</groupId>
+			<artifactId>demo-certs</artifactId>
+			<scope>runtime</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<artifactId>maven-assembly-plugin</artifactId>
+				<!-- inherit configuration from parent POM -->
+			</plugin>
+			<plugin>
+				<artifactId>maven-dependency-plugin</artifactId>
+				<executions>
+					<execution>
+						<id>copy-installed</id>
+						<?m2e ignore?>
+						<phase>install</phase>
+						<goals>
+							<goal>copy</goal>
+						</goals>
+						<configuration>
+							<artifactItems>
+								<artifactItem>
+									<groupId>${project.groupId}</groupId>
+									<artifactId>cf-encrypt</artifactId>
+									<version>${project.version}</version>
+									<type>${project.packaging}</type>
+								</artifactItem>
+							</artifactItems>
+							<outputDirectory>target</outputDirectory>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+
+</project>

demo-apps/cf-cloud-demo-server/service/cali.service

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+#/*******************************************************************************
+# * Copyright (c) 2024 Contributors to the Eclipse Foundation.
+# * 
+# * See the NOTICE file(s) distributed with this work for additional
+# * information regarding copyright ownership.
+# * 
+# * This program and the accompanying materials
+# * are made available under the terms of the Eclipse Public License v2.0
+# * and Eclipse Distribution License v1.0 which accompany this distribution.
+# * 
+# * The Eclipse Public License is available at
+# *    http://www.eclipse.org/legal/epl-v20.html
+# * and the Eclipse Distribution License is available at
+# *    http://www.eclipse.org/org/documents/edl-v10.html.
+# * 
+# * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+# * 
+# ******************************************************************************/
+#
+# To install, cp <file> to /etc/systemd/system
+#
+# The value of "TasksMax" is increasing with the numbers of connectors 
+# according the used networkconfig.
+#
+# Use
+#   top -H
+#
+# to see the number of threads
+#
+# In order to update the service, cp the new .jar to
+# /home/cali/cf-cloud-demo-server-update.jar
+#
+# on 
+#  systemctl restart cali
+#
+# that file is copied to cf-cloud-demo-server.jar and executed.
+# If cf-cloud-demo-server.jar is updated inplace when running,
+# that my cause unintended exceptions, which prevents Californium 
+# from successfully gracefull-restart of the dtls state. 
+# 
+
+[Unit]
+Description=Californium Cloud Demo Server
+BindsTo=network-online.target
+After=network-online.target
+RequiresMountsFor=/home
+
+[Service]
+Type=simple
+TasksMax=256
+User=cali
+WorkingDirectory=/home/cali
+Environment="JAR=cf-cloud-demo-server.jar"
+Environment="OPTS=-XX:MaxRAMPercentage=75 -Dlogback.configurationFile=./logback.xml"
+Environment="ARGS1=--no-loopback --store-file=connections.bin --store-max-age=72 --store-password64=TDNLOmJTWi13JUs/YGdvNA=="
+Environment="ARGS2=--device-file=demo-devices.txt --coaps-credentials ."
+Environment="HTTPS_ARGS=--https-port=8080"
+Environment="HTTPS_CERT_ARGS=--https-credentials=/etc/letsencrypt/live/<domain>"
+ExecStartPre=/bin/cp -u cf-cloud-demo-server-update.jar ${JAR}
+ExecStart=/usr/bin/java $OPTS -jar ${JAR} $ARGS1 $ARGS2 $HTTPS_ARGS $HTTPS_CERT_ARGS
+RestartSec=10
+Restart=always
+OOMPolicy=stop
+
+[Install]
+WantedBy=multi-user.target

demo-apps/cf-cloud-demo-server/service/cloud-installs/cloud-config-dev.yaml

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+#cloud-config
+
+#/*******************************************************************************
+# * Copyright (c) 2024 Contributors to the Eclipse Foundation.
+# * 
+# * See the NOTICE file(s) distributed with this work for additional
+# * information regarding copyright ownership.
+# * 
+# * This program and the accompanying materials
+# * are made available under the terms of the Eclipse Public License v2.0
+# * and Eclipse Distribution License v1.0 which accompany this distribution.
+# * 
+# * The Eclipse Public License is available at
+# *    http://www.eclipse.org/legal/epl-v20.html
+# * and the Eclipse Distribution License is available at
+# *    http://www.eclipse.org/org/documents/edl-v10.html.
+# * 
+# * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
+# * 
+# ******************************************************************************/
+#
+# cloud-init configuration to deploy local artefacts with deploy-dev.sh
+
+package_upgrade: true
+
+packages:
+# java - runtime for java application
+ - openjdk-17-jre-headless
+# fail2ban - network protection 
+ - fail2ban
+
+snap:
+  commands:
+   - snap refresh
+# public x509 certificate / letsencrypt 
+   - snap install --classic certbot
+
+disable_root: false
+
+users:
+ - name: cali
+   gecos: (Cf) Californium Demo Server
+   lock_passwd: true
+
+# the java application, ip-firewall and fail2ban configuration
+# are applied from local storage with scp/ssh
+