c# - Mqtt No such host is known error -


i developing mqtt protocol based application in .net core application develop application using below link mqtt

my code 

public static void main(string[] args) {   mqttclient client = new mqttclient("broker.hivemq.com");   byte code = client.connect(guid.newguid().tostring(), "username", "password");   console.writeline("code " + code);   client.mqttmsgpublished += client_mqttmsgpublished;               ushort msgid = client.publish("mytopic", // topic      encoding.utf8.getbytes("hai sample chat application"), // message body      mqttmsgbase.qos_level_exactly_once, // qos level      true); // retained  console.writeline("msgid " + msgid);  client.mqttmsgpublishreceived += client_mqttmsgpublishreceived;   void client_mqttmsgpublished(object sender, mqttmsgpublishedeventargs e)  {    debug.writeline("messageid = " + e.messageid + " published = " + e.ispublished);    console.writeline("messageid = " + e.messageid + " published = " + e.ispublished);  }   void client_mqttmsgsubscribed(object sender, mqttmsgsubscribedeventargs e)  {    debug.writeline("subscribed id = " + e.messageid);    console.writeline("subscribed id = " + e.messageid);  }   void client_mqttmsgpublishreceived(object sender, mqttmsgpublisheventargs e)  {    debug.writeline("received = " + encoding.utf8.getstring(e.message) + " on topic " + e.topic);    console.writeline("received = " + encoding.utf8.getstring(e.message) + " on topic " + e.topic);  }

}

subscriber code: 

mosquitto_sub -h broker.hivemq.com -t mytopic(terminal)

when run application message send subscriber when trying publish message terminal application doesn't receive message

published code in terminal

mosquitto_pub -h broker.hivemq.com -t mytopic -m "hai sample"

so how receive published message terminal?

i using mqtt client mqttclient client = new mqttclient("broker.hivemq.com");

when trying change ip address didn't run getting error like

 unhandled exception: system.aggregateexception: 1 or more errors occurred. (no such host known) ---> system.net.sockets.socketexception: no such host known

working fine below code

string[] topic = { "mytopic"}; byte[] qoslevels = { mqttmsgbase.qos_level_exactly_once }; client.subscribe(topic, qoslevels);

the above code missing in code.terminal c# console , c# console terminal.


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