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FreeOpcUa / python-opcua

LGPL Pure Python OPC-UA Client and Server
http://freeopcua.github.io/
GNU Lesser General Public License v3.0
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Client-Server connection times out after a few minutes from Node-RED #1114

Open sb934 opened 4 years ago

sb934 commented 4 years ago

For simulation purposes, I have a server file written in python which refreshes new values every few seconds. I am trying to connect to this server running on my local-host, to read node values. The communication is SignedAndEncrypted (Basic256Sha256) policy ; where the server has it's own copy of certificate and private key attached and meanwhile I am using the default certificate, key pair of NodeRed OPCUA. I am able to connect and retrieve values for the first few minutes, however the connection fails after a few minutes and fails to reconnect. I am attaching the error log...

Error Log received on server.py

''' Exception raised while parsing message from client, closing Traceback (most recent call last): File "/home/saksham/.local/lib/python3.7/site-packages/opcua/server/binary_server_asyncio.py", line 75, in _process_data ret = self.processor.process(hdr, buf) File "/home/saksham/.local/lib/python3.7/site-packages/opcua/server/uaprocessor.py", line 83, in process msg = self._connection.receive_from_header_and_body(header, body) File "/home/saksham/.local/lib/python3.7/site-packages/opcua/common/connection.py", line 309, in receive_from_header_and_body chunk = MessageChunk.from_header_and_body(self.security_policy, header, body) File "/home/saksham/.local/lib/python3.7/site-packages/opcua/common/connection.py", line 49, in from_header_and_body decrypted = crypto.decrypt(data.read(len(data))) File "/home/saksham/.local/lib/python3.7/site-packages/opcua/crypto/security_policies.py", line 172, in decrypt return self.Decryptor.decrypt(data) AttributeError: 'NoneType' object has no attribute 'decrypt' '''

Error on node-red terminal

21:51:10.710Z :message_builder_base :109 Error client1 _decrypt_MSG : Sign and Encrypt : Invalid packet signature

AndreasHeine commented 4 years ago

does it reconnect after restarting the flow? sounds like secure channel thing...

python-opcua version? node version? node-red version? wich nodes (nodered-contrib-opcua) do you use?

sb934 commented 4 years ago

Yess it does. It repeats the same thing tho. Connects for a few minutes, returns the value and then disconnects throwing these error logs. Do you think there's an issue with the encryption, certificates?

AndreasHeine commented 4 years ago

no if its with the certs it wouldnt work at all!

post the versions!

sb934 commented 4 years ago

That's exactly what I thought because the authentication is validated but then it disconnects. I am unable to pinpoint the issue here. Do you want me to share the server code?

AndreasHeine commented 4 years ago

versions should be enought

sb934 commented 4 years ago

OPCUA version 0.98.12 NodeJS version 14.7 Node-RED version 1.1.2

OpcUA Client Node is used from node-red-contrib-opcua package...

AndreasHeine commented 4 years ago

ok could take a while!

AndreasHeine commented 4 years ago

could you have a look in node-red -> pallet -> node-red-contrib-opcua -> version ?

edit:

hang on i have trouble connecting with node-red-contrib-opcua (v0.2.78) to any other opc ua server ("S7-1500", "node-red-contrib-iiot-opcua flex server" and "python-opcua server")... might be something with node-opcua not sure at the moment. the last time i used these nodes it was version 0.2.51 and they work fine!

AndreasHeine commented 4 years ago

@sb934 please send me your client node as export!