Got two errors during connection for 32 and 64 bit installation: OPCError: Class not registered and ConnectionRefusedError

[danilNil]

Hi there!

I want to use this library for connecting to OPC DA from linux machine. However I can not even get local connection to OPC DA server working. Please help me to figure out where my mistake is.

Environment

Windows Server 2016 Standart 64 bit
Python 3.10.11 - 64 bit in windows shell and Python 3.11.4 32 bit under miniconda3

Steps to reproduce

32 bits installation

1. install OPC Core Components Redistributable (x86) 3.00.107
2. Restart windows server
3. Compiled 32 bit zzzOpenOPCService by using instruction from this comment Starting zzzOpenOPCService error ya-mouse/openopc#5 (comment) and put it to Program Files (x86)
4. Install and start service OpenOPCService
5. Copy 32 bit version of gbda_aut.dll to SysWoW64
6. Move to SysWoW64 folder and run %SystemRoot%\SysWoW64\regsvr32 gbda_aut.dll
7. Install MatriconOPCSimulator and run it
8. Setup env variables
   1. OPC_CLASS=OPC.Automation
   2. OPC_CLIENT=OpenOPC
   3. OPC_GATE_HOST={server-ip} (tried with localhost as well)
   4. OPC_GATE_PORT=7766
   5. OPC_HOST=localhost
   6. OPC_MODE=dcom
   7. OPC_SERVER=Matrikon.OPC.Simulation
9. Create inbound outbound rule for port 7766 (tried with turned off firewall as well)
10. Download and install openopc2 via pip under 32 bit version of Python in miniconda3
11. Run python -m openopc2 list-servers in miniconda shell and got
    1. [11:11:49] ERROR Could not connect to OPC server: cannot connect to ({server-ip}, 7766): [WinError 10061] cli.py:344 No connection could be made because the target machine actively refused it

64 bit installation

1. install OPC Core Components Redistributable (x64) 3.00.107
2. Restart windows server
3. Delete previous installed OpenOPCService and uninstall gbda_aut.dll
4. Download OpenOPCService from https://github.com/iterativ/openopc2/releases/tag/0.1.11 and put it to Program Files
5. Install and start service OpenOPCService
6. Copy 64 bit version of gbda_aut.dll to System32
7. Got to System32 and run regsvr32 gbda_aut.dll
8. Setup env variables
   1. OPC_CLASS=OPC.Automation
   2. OPC_CLIENT=OpenOPC
   3. OPC_GATE_HOST={server-ip}
   4. OPC_GATE_PORT=7766
   5. OPC_HOST=localhost
   6. OPC_MODE=dcom
   7. OPC_SERVER=Matrikon.OPC.Simulation
9. Create inbound outbound rule for port 7766 (tried with turned off firewall as well)
10. Download OpenOPCCli from https://github.com/iterativ/openopc2/releases/tag/0.1.11 and put it to Program Files
11. Run openopcCLI server-info
12. Got
    1. OPCError: (OPCError(...), 'Dispatch: (-2147221164, 'Class not registered', None, None) opc_class:"OPC.Automation"') [13832] Failed to execute script 'cli' due to unhandled exception!

[jamesbraza]

Note I am using this fork of openopc, not openopc2, mainly because I couldn't get openopc2 multithreading to work.

I found installing Matrikon OPC Explorer onto the client machine installs some special sauce that was required for me to get openopc to work.

Are you able to use Matrikon OPC Explorer (client machine) to read from Matrikon OPC Simulation Server (server machine)? I would say test that connectivity works first.

[renzop]

Hi,

Please don't mix openopc from yamouse with this project... they are not the same codebase and not compatible.

1. Why do you compile the executables, instead of downloading them from this repo? (same location as cli)
2. Can you try what happens, when you set the environment variable

OPC_CLASS=Graybox.OPC.DAWrapper

[danilNil]

Hey @renzop! Appreciate the assistance! Now 64 bit version functions with both Windows server and MacOS 🔥

[renzop]

changed readme according to this.

[renzop]

@danilNil what did do to get everything 64bit working... ?

[danilNil]

Hi @renzop ! You can see steps above to get connected to OPC DA. I've just changed OPC_CLASS=Graybox.OPC.DAWrapper. But in order to get tags values you need to fix a bug in openopc2 library. Let me ping another developer from our team... @s-tatus found some bugs in openopc2 and fixed them.

[danilNil]

@s-tatus could you create PR to openopc2 with your fixes?

[renzop]

@danilNil @s-tatus that PR would be great. Even if its not as cleas as you like... I will do the rest

[renzop]

When running the tests in a 64bit environment i get

Process finished with exit code -1073741819 (0xC0000005)

[renzop]

@danilNil, @s-tatus Any chance to create that pull request? Or just the snippet of the changes.

[renzop]

@danilNil, @s-tatus Any chance to create that pull request? Or just the snippet of the changes. That would be really great and good for your Karma :-)