BG95-M3 MQTT how to Publish 0 bytes

Hi EveryBody,
I’m Using BG95-M3 modules in production with MQTT protocol (ssl/tsl enabled).
For new features (retained messages), i’m looking for sending 0 bytes messages (to delete a retain message on the brocker).
On the module documentation, the minimum Length seems to be 1 and using ctrl+z just after “>” don’t seems to work.
Do you have any Idea?

Best regards,