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org.eclipse.paho.client.mqttv3.MqttException: Client is not connected at org.eclipse.paho.client.mqttv3.internal.ExceptionHelper.createMqttException(ExceptionHelper.java:31) at org.eclipse.paho.client.mqttv3.internal.ClientComms.sendNoWait(ClientComms.java:177) at org.eclipse.paho.client.mqttv3.MqttAsyncClient.publish(MqttAsyncClient.java:1126) at org.eclipse.paho.client.mqttv3.MqttAsyncClient.publish(MqttAsyncClient.java:1089) at org.eclipse.paho.client.mqttv3.MqttAsyncClient.publish(MqttAsyncClient.java:1096) at org.eclipse.kapua.gateway.client.mqtt.paho.PahoClient.publish(PahoClient.java:249) at org.eclipse.kapua.gateway.client.mqtt.paho.PahoClient.publishMqtt(PahoClient.java:244) at org.eclipse.kapua.gateway.client.kura.KuraBirthCertificateModule.sendBirthCertificate(KuraBirthCertificateModule.java:173) at org.eclipse.kapua.gateway.client.kura.KuraBirthCertificateModule.applicationAdded(KuraBirthCertificateModule.java:125) at org.eclipse.kapua.gateway.client.spi.AbstractClient.lambda$notifyAddApplication$1(AbstractClient.java:93) at org.eclipse.kapua.gateway.client.spi.AbstractClient.fireModuleEvent(AbstractClient.java:85) at org.eclipse.kapua.gateway.client.spi.AbstractClient.notifyAddApplication(AbstractClient.java:93) at org.eclipse.kapua.gateway.client.spi.AbstractClient.internalBuildApplication(AbstractClient.java:148) at org.eclipse.kapua.gateway.client.spi.AbstractClient$2.build(AbstractClient.java:134) at communications.kapua.KapuaClient.<init>(KapuaClient.java:73) at simulation.main.Simulation.main(Simulation.java:55)