8.3 : Implements of com.inductiveautomation.ignition.gateway.opcua.server.api.Driver interface

mazeyrat · September 5, 2025, 12:55pm

Ignition 8.3

I try to upgrade a 8.1 driver module that implements com.inductiveautomation.ignition.gateway.opcua.server.api.Driver interface.

github.com/kevinherron/modbus-server-driver

msd-gateway/src/main/java/com/kevinherron/ignition/modbus/ModbusAddressSpace.java

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package com.kevinherron.ignition.modbus;

import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.uint;
import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.ulong;
import static org.eclipse.milo.opcua.stack.core.types.builtin.unsigned.Unsigned.ushort;

import com.digitalpetri.modbus.server.ProcessImage;
import com.digitalpetri.modbus.server.ProcessImage.Modification.CoilModification;
import com.digitalpetri.modbus.server.ProcessImage.Modification.DiscreteInputModification;
import com.digitalpetri.modbus.server.ProcessImage.Modification.HoldingRegisterModification;
import com.digitalpetri.modbus.server.ProcessImage.Modification.InputRegisterModification;
import com.digitalpetri.modbus.server.ProcessImage.Transaction;
import com.inductiveautomation.ignition.gateway.opcua.server.api.OpcUa;
import com.kevinherron.ignition.modbus.address.ModbusAddress;
import com.kevinherron.ignition.modbus.address.ModbusAddress.ModbusArea;
import com.kevinherron.ignition.modbus.address.ModbusAddressParser;
import com.kevinherron.ignition.modbus.address.ModbusDataType;
import com.kevinherron.ignition.modbus.util.ModbusByteUtil;
import java.io.IOException;
import java.nio.ByteBuffer;

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I have some issue with read and write method.

pending.readValueId is not found ???

pending.writeValueId and PendingValueWrite are not found ???

I have the right version ?

<ignition-platform-version>8.3.0</ignition-platform-version>
<ignition-sdk-version>${ignition-platform-version}-SNAPSHOT</ignition-sdk-version>

<repository>
    <id>ia-beta</id>
    <url>https://nexus.inductiveautomation.com/repository/inductiveautomation-beta</url>
    <snapshots>
        <enabled>true</enabled>
    </snapshots>
</repository>

Kevin.Herron · September 5, 2025, 1:07pm

Those classes are defined privately in the same file you linked:

github.com/kevinherron/modbus-server-driver

msd-gateway/src/main/java/com/kevinherron/ignition/modbus/ModbusAddressSpace.java

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          private static class PendingRead {
          
            volatile DataValue value;
            final ReadValueId readValueId;
          
            private PendingRead(ReadValueId readValueId) {
              this.readValueId = readValueId;
            }
          }
          
          private static class PendingWrite {
          
            volatile StatusCode statusCode;
            final WriteValue writeValue;
          
            private PendingWrite(WriteValue writeValue) {
              this.writeValue = writeValue;
            }
          }

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mazeyrat · September 5, 2025, 1:54pm

I use the read implementation based on:

github.com/eclipse-milo/milo

opc-ua-sdk/sdk-server/src/main/java/org/eclipse/milo/opcua/sdk/server/api/ManagedAddressSpace.java

bd150672c


      
          public void registerNodes(RegisterNodesContext context, List<NodeId> nodeIds) {
              context.success(nodeIds);
          }
          
          @Override
          public void unregisterNodes(UnregisterNodesContext context, List<NodeId> nodeIds) {
              context.success(Collections.nCopies(nodeIds.size(), Unit.VALUE));
          }
          
          @Override
          public void read(
              ReadContext context,
              Double maxAge,
              TimestampsToReturn timestamps,
              List<ReadValueId> readValueIds
          ) {
          
              List<DataValue> results = Lists.newArrayListWithCapacity(readValueIds.size());
          
              for (ReadValueId readValueId : readValueIds) {
                  UaServerNode node = nodeManager.get(readValueId.getNodeId());

but in 8.3 readAttribute has changed ?

mazeyrat · September 5, 2025, 2:03pm

DataValue value =
        AttributeReader.readAttribute(
                readContext,
                node,
                readValueId.getAttributeId(),
                timestampsToReturn,
                readValueId.getIndexRange(),
                readValueId.getDataEncoding());

github.com/kevinherron/modbus-server-driver

msd-gateway/src/main/java/com/kevinherron/ignition/modbus/BrowsableAddressSpace.java

b4b00bd74

package com.kevinherron.ignition.modbus;

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.eclipse.milo.opcua.sdk.core.Reference;
import org.eclipse.milo.opcua.sdk.server.AddressSpaceFilter;
import org.eclipse.milo.opcua.sdk.server.AttributeReader;
import org.eclipse.milo.opcua.sdk.server.ManagedAddressSpaceFragmentWithLifecycle;
import org.eclipse.milo.opcua.sdk.server.OpcUaServer;
import org.eclipse.milo.opcua.sdk.server.SimpleAddressSpaceFilter;
import org.eclipse.milo.opcua.sdk.server.items.DataItem;
import org.eclipse.milo.opcua.sdk.server.items.MonitoredItem;
import org.eclipse.milo.opcua.sdk.server.nodes.UaFolderNode;
import org.eclipse.milo.opcua.sdk.server.nodes.UaServerNode;
import org.eclipse.milo.opcua.sdk.server.util.SubscriptionModel;
import org.eclipse.milo.opcua.stack.core.AttributeId;
import org.eclipse.milo.opcua.stack.core.NodeIds;
import org.eclipse.milo.opcua.stack.core.StatusCodes;

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oops will have to use the 8.3 version for BrowsableAddressSpace