Rogier Cobben created PLC4X-288:
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Summary: 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
The Mock driver is usefull for developing applications without available
hardware. Reads from Mock devices work, but writes seem broken.
Scenario:
Extend *MockDevice* class and implement 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()
{code}
instead and do not have a value member in the Field class. (e.g. Simulator,
Modbus )
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