Connectivity Software User's Guide and Reference
SubscribeDevicePayload(IEasySparkplugConsumer,SparkplugHostDescriptor,String,String,String) Method



OpcLabs.EasySparkplug Assembly > OpcLabs.EasySparkplug Namespace > IEasySparkplugConsumerExtension Class > SubscribeDevicePayload Method : SubscribeDevicePayload(IEasySparkplugConsumer,SparkplugHostDescriptor,String,String,String) Method
The consumer object that will perform the operation.

The value of this parameter cannot be null (Nothing in Visual Basic).

The Sparkplug host descriptor.

The value of this parameter cannot be null (Nothing in Visual Basic).

The Sparkplug group ID.

The value represents a Sparkplug group ID, or a filter for Sparkplug group IDs. It must be a string with valid UTF-8 characters except for the reserved character '/' (forward slash). Characters '+' (plus) and '#' are filters, and can only be used when they are the single character in the string.

The value of this parameter cannot be null (Nothing in Visual Basic).

The Sparkplug edge node ID.

The value represents a Sparkplug edge node ID, or a filter for Sparkplug edge node IDs. It must be a string with valid UTF-8 characters except for the reserved character '/' (forward slash). Characters '+' (plus) and '#' are filters, and can only be used when they are the single character in the string.

The value of this parameter cannot be null (Nothing in Visual Basic).

The Sparkplug device ID.

The value of this parameter cannot be null (Nothing in Visual Basic).

Subscribes to payloads from a device, specifying the host descriptor, group ID, edge node ID and device ID.
Syntax
'Declaration
 
<ExtensionAttribute()>
Public Overloads Shared Function SubscribeDevicePayload( _
   ByVal consumer As IEasySparkplugConsumer, _
   ByVal hostDescriptor As SparkplugHostDescriptor, _
   ByVal groupId As String, _
   ByVal edgeNodeId As String, _
   ByVal deviceId As String _
) As Integer
'Usage
 
Dim consumer As IEasySparkplugConsumer
Dim hostDescriptor As SparkplugHostDescriptor
Dim groupId As String
Dim edgeNodeId As String
Dim deviceId As String
Dim value As Integer
 
value = IEasySparkplugConsumerExtension.SubscribeDevicePayload(consumer, hostDescriptor, groupId, edgeNodeId, deviceId)

Parameters

consumer
The consumer object that will perform the operation.

The value of this parameter cannot be null (Nothing in Visual Basic).

hostDescriptor
The Sparkplug host descriptor.

The value of this parameter cannot be null (Nothing in Visual Basic).

groupId
The Sparkplug group ID.

The value represents a Sparkplug group ID, or a filter for Sparkplug group IDs. It must be a string with valid UTF-8 characters except for the reserved character '/' (forward slash). Characters '+' (plus) and '#' are filters, and can only be used when they are the single character in the string.

The value of this parameter cannot be null (Nothing in Visual Basic).

edgeNodeId
The Sparkplug edge node ID.

The value represents a Sparkplug edge node ID, or a filter for Sparkplug edge node IDs. It must be a string with valid UTF-8 characters except for the reserved character '/' (forward slash). Characters '+' (plus) and '#' are filters, and can only be used when they are the single character in the string.

The value of this parameter cannot be null (Nothing in Visual Basic).

deviceId
The Sparkplug device ID.

The value of this parameter cannot be null (Nothing in Visual Basic).

Return Value

Returns a payload subscription handle that can be used to unsubscribe.
Exceptions
ExceptionDescription

A null reference (Nothing in Visual Basic) is passed to a method that does not accept it as a valid argument.

This is a usage error, i.e. it will never occur (the exception will not be thrown) in a correctly written program. Your code should not catch this exception.

Remarks

To unsubscribe from the payload, use the UnsubscribePayload, UnsubscribeAllPayloads or UnsubscribeAll method.

This is an extension method (info: C#, VB.NET). In languages that have support for extensions methods (such as C# and VB.NET), you can use the extension method as if it were a regular method on the object that is its first parameter. In other languages (such as with Python.NET), you will call the extension as a static method, and pass it the object on which it acts as its first parameter.

 

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Requirements

Target Platforms: .NET Framework: Windows 10 (selected versions), Windows 11 (selected versions), Windows Server 2016, Windows Server 2022; .NET: Linux, macOS, Microsoft Windows

See Also