BitChat uses a store-and-forward system to temporarily hold messages for devices that are not within Bluetooth range or not actively connected to the mesh, and delivers them once they reconnect.

Quotes that support claims

In order to provide dependable delivery even in interrupted environments, BitChat also features a “store and forward” system that temporarily stores messages for offline users and delivers them once they reconnect.

The platform has a store-and-forward system that stores messages offline for users at specific time intervals.