OBEX (object Exchange), a user-oriented protocol in Bluetooth stack, provides a united criterion for putting and getting data objects (File and Directory) simply and flexibly.
OBEX作为蓝牙协议栈中面向应用的会话层协议，提供了灵活的目标文件交换方式。
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Collecting bill files online means that the equipment USES a kind of file transfer protocol to collect bill files from an exchange through a data network automatically.