BlueZ, the Linux Bluetooth stack, is now up to version 5.10 and with it comes many fixes plus the OBEX command-line client. OBject EXchange is the communication protocol for exchanging binary objects between devices and is similar in design to HTTP. OBEX is supported by modern Bluetooth devices plus various other mobile devices via either Bluetooth or Infrared interfaces. In the new 5.10 release is a new "obexctl" program by Intel.
The obexctl BlueZ OBEX client allows for executing various commands like copying files/to from devices, other file handling, and basic support for exchanging objects/files over Bluetooth.
Besides the OBEX command-line client the rest of the 5.10 release changes come down to fixes concerning MAP messages, AVRCP, and discoverable timeout handling. More details on BlueZ 5.10 can be found via the release commit.