Write custom server/client adapter for replacing WebSocket with third-party pub/sub service
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NBest material would be having a read of similar adapters
NAnd createCaller too, which might be a good foundation for an adapter which meets your needs
NIām not familiar with our subscriptions feature though, just take that as some signposts 
Many luck about Ably adapter?
MAlso struggling to do this, I've tried both Azure Pub/Sub and Ably but I feel like I'm missing something in terms of how to integrate applyWSSHandler / provide context. Has anyone made any headway here?