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https://issues.apache.org/jira/browse/PLC4X-288?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17630934#comment-17630934
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Lukas Ott commented on PLC4X-288:
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This issue has been migrated to https://github.com/apache/plc4x/issues/611
> Mock driver always writes null value
> ------------------------------------
>
> Key: PLC4X-288
> URL: https://issues.apache.org/jira/browse/PLC4X-288
> Project: Apache PLC4X
> Issue Type: Bug
> Components: Testing
> Affects Versions: 0.8.0
> Reporter: Rogier Cobben
> Priority: Major
>
> The Mock driver is usefull for developing applications without available
> hardware. Reads from Mock devices work, but writes seem broken.
> Scenario:
> implement *MockDevice* interface and the *write* method. See that this device
> is set in the connection using the *MockConnection*.*setDevice* method.
> When a WriteRequest is issued on the connection, the *MockDevice*.*write*
> method is indeed called, but the *value* parameter is always _*null*_. The
> given value to write is not passed through.
> Debugging and looking into the sourcecode shows following:
> *MockConnection.write* uses following statement to retrieve the value:
>
> {code:java}
> // MockConnection:147
> ((MockField) writeRequest.getField(name)).getPlcValue()
> {code}
> This retrieves the *plcValue* member from the MockField object. This
> *plcValue* is written to by constructor *MockField(String address,
> MockPlcValue plcValue)* only. However, I did not find any call to this
> constructor.
>
> Note:
> Other Drivers seem to use
> {code:java}
> writeRequest.getPlcValue(fieldName)
> {code}
> instead and do not have a value member in the Field class. (e.g. Simulator,
> Modbus )
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