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In order to authenticate and configure an incoming SCO connection, the BT_DEFER_SETUP option was added. This option is intended to defer reply to Connect Request on SCO sockets. When a connection is requested, the listening socket is unblocked but the effective connection setup happens only on first recv. Any send between accept and recv fails with -ENOTCONN. Signed-off-by: Frédéric Dalleau <frederic.dalleau@linux.intel.com> Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>