diff -ruN californium_3.8.0/demo-apps/cf-plugtest-server/src/main/java/org/eclipse/californium/plugtests/PlugtestServer.java californium/demo-apps/cf-plugtest-server/src/main/java/org/eclipse/californium/plugtests/PlugtestServer.java
--- californium_3.8.0/demo-apps/cf-plugtest-server/src/main/java/org/eclipse/californium/plugtests/PlugtestServer.java	2023-07-21 11:16:21.142201240 +0200
+++ californium/demo-apps/cf-plugtest-server/src/main/java/org/eclipse/californium/plugtests/PlugtestServer.java	2023-07-21 11:16:51.074210378 +0200
@@ -100,6 +100,14 @@
 import org.eclipse.californium.unixhealth.NetSocketHealthLogger;
 import org.eclipse.californium.unixhealth.NetStatLogger;
 
+import org.eclipse.californium.scandium.DTLSConnector;
+import org.eclipse.californium.scandium.config.DtlsConnectorConfig;
+import org.eclipse.californium.scandium.dtls.pskstore.AdvancedSinglePskStore;
+import org.eclipse.californium.core.network.CoapEndpoint;
+
+import java.net.InetSocketAddress;
+import java.net.InetAddress;
+
 import picocli.CommandLine;
 import picocli.CommandLine.ArgGroup;
 import picocli.CommandLine.Command;
@@ -437,7 +445,23 @@
 			// server.addEndpoint(new CoAPEndpoint(new InetSocketAddress("127.0.0.1", port)));
 			// server.addEndpoint(new CoAPEndpoint(new InetSocketAddress("2a01:c911:0:2010::10", port)));
 			// server.addEndpoint(new CoAPEndpoint(new InetSocketAddress("10.200.1.2", port)));
-			server.addEndpoints(config);
+			// server.addEndpoints(config);
+
+			CoapEndpoint.Builder endpointBuilder = new CoapEndpoint.Builder();
+			endpointBuilder.setPort(5683);
+			server.addEndpoint(endpointBuilder.build());
+
+			AdvancedSinglePskStore pskStore = new AdvancedSinglePskStore("Client_identity", "secretPSK".getBytes());
+
+			DtlsConnectorConfig.Builder builder = new DtlsConnectorConfig.Builder(new Configuration());
+			builder.setAddress(new InetSocketAddress(5684));
+			builder.setAdvancedPskStore(pskStore);
+			DTLSConnector dtlsConnector = new DTLSConnector(builder.build());
+
+			endpointBuilder = new CoapEndpoint.Builder();
+			endpointBuilder.setConnector(dtlsConnector);
+			server.addEndpoint(endpointBuilder.build());
+
 			if (server.getEndpoints().isEmpty()) {
 				System.err.println("no endpoint available!");
 				System.exit(ERR_INIT_FAILED);