So what you’ll need is an always-on connection from a websocket client, that then sends calls Bubble’s REST API (backend workflow endpoint) or Data API (insert data into a table).
I think AWS Lambda won’t be suitable, as its not going to give a long-term connection. But AWS have other products that may be suitable, for example spinning up a web server.
Webhookrelay offer a websocket server … they don’t mention a websocket client, but its possible they do offer this too, it’d be worth asking them.
Another alternative is commission an API developer to write a service to do the above, in an easily hosted language such as PHP or Node (or really anything goes if you end up using a VPS).