GitHub user bossenti added a comment to the discussion: Python Support for 
Adapters, Processors, & Sinks

> the documents say it is for storing into an Apache CouchDB and not OPC-UA so 
> I was a bit confused.

Damn, that's simply an error in the documentation. I'll fix it.
The OPC-UA sink is only capable to write to a OPC-UA server. This is done by 
using a OPC-UA client library, StreamPipes itself does not provide or operate 
(as) an OPC-UA server. However, in can serve as an intermediate between two 
OPC-UA servers being able both reading and writig from/to an OPC-UA server.

No, it's not possible to directly push data to StreamPipes via it's REST API 
directly. This is due to the concept that data always comes via an adapter into 
StreamPipes. However, you could use the [HTTP server 
adapter](https://streampipes.apache.org/docs/next/pe/org.apache.streampipes.connect.iiot.protocol.stream.httpserver/).
 This spins up a HTTP server providing you an endpoint to which data can be 
pushed which is then available in StreamPipes. Please keep in mind that this 
adapter has mainly been used for development and testing purposes.
What is your idea behind such an approach? If you don't mind sharing, we migh 
have a better solution available.

Hope this helps! 🙂 

GitHub link: 
https://github.com/apache/streampipes/discussions/2824#discussioncomment-9344545

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