NiFi Websocket Subscribe Message

[#1]

Hello,

I'm trying to create a process group on Nifi to connect to a websocket server from a device that has an embedded public API.

This websocket needs a subscription message to send me event data from this device.

I'd like a tip on how to send this subscription message to the websocket (processors needed and fields to fill)?

Thanks in advance.

[#2]

I have exactly the same question; hot to open a client WebSocket where you need to send an initial subscription message