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/etc/bluetooth/bt_stack.conf

# Enable BtSnoop logging function
# valid value : true, false
BtSnoopLogOutput=true

# BtSnoop log output file
BtSnoopFileName=/sdcard/btsnoop_hci.log

# Preserve existing BtSnoop log before overwriting
BtSnoopSaveLog=true

# Enable trace level reconfiguration function
# Must be present before any TRC_ trace level settings
TraceConf=true

# Trace level configuration
#   BT_TRACE_LEVEL_NONE    0    ( No trace messages to be generated )
#   BT_TRACE_LEVEL_ERROR   1    ( Error condition trace messages )
#   BT_TRACE_LEVEL_WARNING 2    ( Warning condition trace messages )
#   BT_TRACE_LEVEL_API     3    ( API traces )
#   BT_TRACE_LEVEL_EVENT   4    ( Debug messages for events )
#   BT_TRACE_LEVEL_DEBUG   5    ( Full debug messages )
#   BT_TRACE_LEVEL_VERBOSE 6    ( Verbose messages ) - Currently supported for TRC_BTAPP only.
TRC_BTM=6
TRC_HCI=6
TRC_L2CAP=6
TRC_RFCOMM=6
TRC_OBEX=6
TRC_AVCT=6
TRC_AVDT=6
TRC_AVRC=6
TRC_AVDT_SCB=6
TRC_AVDT_CCB=6
TRC_A2D=6
TRC_SDP=6
TRC_GATT=6
TRC_SMP=6
TRC_BTAPP=6
TRC_BTIF=6