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I find it unlikely this program works as expected. You have written approximately:

1. Open a database connection, & assign that to client
2. Get write_api from client
3. Define a function which (at some point in the future) uses write_api
4. Call client.close() due to the exit of the with statement!
5. Ask another function to handle messages by calling your defined function which uses an api on a “now closed” client!

As you can see, the with statement is not doing anything but giving you a false sense of security. You need to either:

• open a new database connection inside handle_message, or
• indent the subsequent code such that client is not closed until after your while True: loop exits (presumably by a KeyboardInterruptException`)