mongodb viewer

src/main/resources/application.properties

@@ -20,6 +20,8 @@ spring.mustache.check-template-location=false
 
 # Launch the default browser when starting the application in development mode
 vaadin.launch-browser=true
+# Disable Vaadin Copilot to avoid NullPointerException in dev mode
+vaadin.copilot.enabled=false
 # To improve the performance during development.
 # For more information https://vaadin.com/docs/latest/flow/integrations/spring/configuration#special-configuration-parameters
 vaadin.allowed-packages=com.vaadin,org.vaadin,de.assecutor.votianlt
@@ -78,5 +80,24 @@ app.messaging.plugin.mqtt.username=app
 app.messaging.plugin.mqtt.password=apppwd
 app.messaging.plugin.mqtt.client.id=votianlt-server
 
+# Client Connection Monitoring (Ping/Pong)
+# Server sends ping to: /client/{clientId}/ping
+# Client responds to:   /server/{clientId}/pong
+#
+# Ping JSON (Server -> Client):
+# {
+#   "type": "ping",
+#   "timestamp": 1702835000000
+# }
+#
+# Pong JSON (Client -> Server):
+# {
+#   "type": "pong",
+#   "timestamp": 1702835000000
+# }
+#
+app.client.ping.interval-seconds=15
+app.client.ping.timeout-seconds=5
+
 # Application Version - automatically set from pom.xml during build
 app.version=@project.version@