Module lifecycle 

Connection lifecycle: RFCOMM connect, OBEX session establishment, and teardown, given an already-resolved device address and channel (SDP lookup happens in imsg-transport::discover).

Functions

connect_map

RFCOMM connect to addr:channel (gating on BT_CONNECTED up to bt_gate, requesting security if given) then establish_map_session.

connect_pbap

RFCOMM connect to addr:channel then PBAP OBEX CONNECT.

establish_map_session

OBEX CONNECT + enable MAP notifications. Caller must hold the returned client — iOS drops notification registration on OBEX DISCONNECT.