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(* 
    _Client             : MQTT.MQTTClient; // Function block to establish a connection to a MQTT broker   
    _ClientEnable       : BOOL;
    _ConnectionState    : SparkplugSessionStateType := SparkplugSessionStateType.OFFLINE;
    _ClientDone         : BOOL;
    _ClientBusy         : BOOL;
    _ClientError        : BOOL;
    _ClientCleanSession : BOOL;
    _ClientId           : STRING(255) := 'ClientID';
    _ClientPingInterval : TIME        := T#15S;
    _ItfTLSContext      : MQTT.NBS.ITLSContext; //Encapsulates all the data neccecray to handle encrypted tcp connections
    //
    //    ciCertInfo : NBS.CERT_INFO := (psInfo:=ADR(commonName), udiSize:=LEN(commonName));
    //    myTLSContext : NBS.TLSContext := (
    //        ePurpose:=NBS.PURPOSE.CLIENT_SIDE,
    //        sUseCaseName:='NBSTest',
    //        sTLSVersion:='1.3',
    //        ciCertInfo:=ciCertInfo,
    //        udiVerificationMode:=2
    //    );
    //END_VAR
_Client( xEnable := _ClientEnable,
         xDone => _ClientDone,
         xBusy => _ClientBusy,
         xError => _ClientError,
         uiPort := _ServerPort,
         xUseTLS := _UseTLS,
         uiKeepAlive := _KeepAlive,
         pbWillMessage := _LastWillMessage,
         uiWillMessageSize := _LastWillMessageSize,
         xWillRetain := _LastWillRetain,
         eWillQoS := _LastWilQos,
         xCleanSession := _ClientCleanSession,
         wsUsername := _Username,
         wsPassword := _Password,
         wsWillTopic := _LastWillTopic,
         sClientId := _ClientId,
         tPingInterval := _ClientPingInterval,
         hCert := _hCert,
         itfTLSContext := _ItfTLSContext,
         itfAsyncProperty := _ItfAsyncProperty,
         sHostname := _ServerUrl,
         eMQTTError => _ClientMQTTError,
         xConnectedToBroker => _ClientConnectedToBroker );'
             udiMaxPayloadSize := SIZEOF( _Subscriber_Message ),
             mqttClient := _Client,
             wsTopicFilter := _Subscriber_TopicFilter,
             xDone => _Subscriber_Done,
             xBusy => _Subscriber_Busy,
             xError => _Subscriber_Error,
             eMQTTError => _Subscriber_MQTTError,
             xReceived => _Subscriber_Received,
             udiPayloadSize => _Subscriber_PayloadSize,
             xSubscribeActive => _Subscriber_Active,
             wsLastTopic => _Subscriber_LastTopic );
TerminateString( ADR( _Subscriber_Message ),
                 _Subscriber_PayloadSize );
// Diagnose
Diag();