DEPRAG Smart Documentation

IsConnected

Read TwinCAT TIA

Network MQTT Client ActiveClients One client

ns=2;s=DEPRAG Smart/Network/MQTT/ActiveClients/0/IsConnected

Indicates whether the MQTT client is connected to the MQTT broker.

Examples:

TwinCAT 3 example
TIA Portal example

In addition to the parameters already explained, the following variables must be created / transferred for the implementation in TwinCAT 3:

Beckhoff parameter:

bMqttIsConnected
A boolean variable that can be used to trigger the execution of the IsConnected command.

OutputMqttIsConnected
A boolean variable to which the return value of the IsConnected command is written.

hrMqttIsConnected
This can be used to monitor the execution of the command. Error codes have the type HRESULT.

fbMqtt
An instance of the "FB_Mqtt" function block supplied with the DEPRAG Smart library.

ClientId
A String(255) variable that specifies the client that should execute the command.

ConnectionHandle
"ConnectionHandle" received when establishing a connection between DEPRAG Smart Server and your OPC UA client.



VAR
   bMqttIsConnected         : BOOL;
   OutputMqttIsConnected        : BOOL;
   hrMqttIsConnected         : HRESULT;

   fbMqtt  : FB_Mqtt;
END_VAR

hrMqttIsConnected := fbMqtt.IsConnected(
        bExecute    := bMqttIsConnected,
        ConnectionHandle  := depragSmartConnection.ConnectionHandle,
        ClientId   := '0',
        Output    => OutputMqttIsConnected);
IF hrMqttIsConnected <> S_FALSE THEN 
    bMqttIsConnected := FALSE;
END_IF

For examples and explanations regarding the calls of nodes via Siemens TIA Portal please refer to the sub-menu "Siemens TIA Portal" in section "Getting Started".