Hi Ben, Thanks for your kindly and quickly reply.
One more question, I am using Prosys OPC UA Simulation Server, and the NodeId is: ns=3;i=1002, NodeClass is Variable, DataType is Double. So, how to define the field address in PLC4x? I checked [1], the example is: DOUBLE_IDENTIFIER = " ns=2;s=HelloWorld/ScalarTypes/Double"; What is the meaning of "HelloWorld/ScalarTypes", or, where I can confirm how to get the needed info of DOUBLE_IDENTIFIER from Prosys OPC UA Simulation Server? [1] https://github.com/apache/plc4x/blob/develop/plc4j/drivers/opcua/src/test/java/org/apache/plc4x/java/opcua/ManualPLC4XOpcua.java Best, ----------------------------------- Xiangdong Huang School of Software, Tsinghua University 黄向东 清华大学 软件学院 Ben Hutcheson <[email protected]> 于2020年12月18日周五 上午8:41写道： > Hi Xiangdong, > > Yes you are right, the example in the opc ua section doesn't look right. I > can take a look at updating it tomorrow. > > Your best bet would be to follow the getting started - java section. > https://plc4x.apache.org/users/getting-started/plc4j.html > > the connection string format for the opc ua driver is > > opcua:tcp://127.0.0.1:12686/milo?discovery=false > > (Discovery option being optional.) > > Also if you are comfortable the 0.8.0-SNAPSHOT is more stable. > > You'll have to add the repository to your pom.xml file though. > > <repositories> > > <repository> > > <id>apache.snapshots</id> > > <name>Apache Snapshot Repository</name> > > <url>https://repository.apache.org/snapshots</url> > > <releases> > > <enabled>false</enabled> > > </releases> > > </repository> > > </repositories> > > > > Specifically with the OPC UA driver we are in the process of merging an > update to the 0.8.0-SNAPSHOT to support specifying the data type in the > address field. > > The current address format is:- > > ns=2;s=HelloWorld/ScalarTypes/Boolean > > This will change to:- > > ns=2;s=HelloWorld/ScalarTypes/Boolean:BOOL > > With the update, however the :BOOL datatype will be optional, unless > you need to read/write unsigned values. > > If you have any more questions let us know. > > Kind Regards, > > Ben > > > On Thu, Dec 17, 2020 at 6:59 PM Xiangdong Huang <[email protected]> > wrote: > > > Hi, > > > > Today I followed the User guide on the website to run PlC4x to collect > > data, and then find an issue of the example [1]. > > > > In the reading data example, the example creates an opcuaReadConnection, > > and then uses opcuaConnection. What is worse, opcuaConnection has no > such a > > read() method but the example calls it.. (version 0.7.0) > > > > I think the API may change but the document did not keep to update. > > > > [1] https://plc4x.apache.org/users/protocols/opc-ua.html > > > > Best, > > ----------------------------------- > > Xiangdong Huang > > School of Software, Tsinghua University > > > > 黄向东 > > 清华大学 软件学院 > > >
