Connect a MQTT server

HI I’m student I’m trying connect a MQTT server with a Java program, I have a suscriptor and publish in code Java.
When I connect a suscriptor in a server MQTT and I send a message with the publish a message the conection it’s ok.
but when I try to send a message with a ignition tag with the follow instrucción “system.cirruslink.engine.publish(“Chariot SCADA”,“ac”,str(“da”).encode(),0,0)” it bloks the conection and the suscriptor doens’t recibe never more.
There are anybody anybody that can help me?


May be this can help.