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FreeOpcUa / opcua-asyncio

OPC UA library for python >= 3.7
GNU Lesser General Public License v3.0
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Subscription mechanism and Publish on binary HTTPS server ? #72

Open Nanahara opened 5 years ago

Nanahara commented 5 years ago

Hi,

I'm trying to implement binary/https opc-ua server by using Tornado https server. But I don't know how subscription mechanism should be processed over HTTPS that is a stateless protocol. How is processed a publish request ? How is sent a publish response ? (Maybe Websocket ?)

Have you an idea about this subject ?

oroulet commented 5 years ago

No. idea. must be written in spec somewhere. What are you trying to do? sounds like a huge project to reimplement everything on tornoda. You should better implment https protocol in opcua-asyncio. by generating xml based format and using a small http server like aiohttp

Nanahara commented 5 years ago

Hi,

The official spec is not very detailed about https usage and I have not found very resources or project about this subject, I will continue to investigate it. Concerning tornado usage, I have no choice to use it. My project is to implement opc ua in an existing web application on tornado.

For moment I have a prototype using tornado and opcua-asyncio. I implemented an handler to reply post request by using for example uaprocessor.py and use UaExpert from Unified Automation to test it.

I will publish my prototype on github if you are interesting when i have a clean version.