BlueZ 5.64 DBus Monitor output If I understand this log correctly, member=Pair gets an error reply of "error_name=org.bluez.Error.AlreadyExists", "Already Paired", even though the "Paired" property is false, and never gets a "PropertiesChanged" member message. This problem went away after rebooting, but happened over and over again, every time I ran my program. If I understand this log correctly, member=Pair gets an error reply of "error_name=org.bluez.Error.AlreadyExists", "Already Paired", even though the "Paired" property is false, and never gets a "PropertiesChanged" member message. Is this a problem in my program, or a bug? Because I was getting this issue, I put a loop in my program to Pair multiple times, waiting a second between attempts, and always check the get results of the Paired property which was always false. Each time I attempted the pair, I got the error that it was already paired. signal time=1659650136.651160 sender=:1.0 -> destination=(null destination) serial=2676 path=/; interface=org.freedesktop.DBus.ObjectManager; member=InterfacesAdded object path "/org/bluez/hci0/dev_CC_F9_57_89_8C_2D" ... dict entry( string "Paired" variant boolean false ) ... method call time=1659650137.811326 sender=:1.96 -> destination=org.bluez serial=9 path=/org/bluez/hci0/dev_CC_F9_57_89_8C_2D; interface=org.freedesktop.DBus.Properties; member=Get string "org.bluez.Device1" string "Paired" method return time=1659650137.816719 sender=:1.0 -> destination=:1.96 serial=2680 reply_serial=9 variant boolean false method call time=1659650137.840411 sender=:1.96 -> destination=org.bluez serial=10 path=/org/bluez/hci0/dev_CC_F9_57_89_8C_2D; interface=org.freedesktop.DBus.Properties; member=Set string "org.bluez.Device1" string "Trusted" variant boolean true signal time=1659650137.843321 sender=:1.0 -> destination=(null destination) serial=2681 path=/org/bluez/hci0/dev_CC_F9_57_89_8C_2D; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged string "org.bluez.Device1" array [ dict entry( string "Trusted" variant boolean true ) ] array [ ] ... method return time=1659650137.846560 sender=:1.0 -> destination=:1.96 serial=2682 reply_serial=10 method call time=1659650137.864578 sender=:1.96 -> destination=org.bluez serial=11 path=/org/bluez/hci0/dev_CC_F9_57_89_8C_2D; interface=org.bluez.Device1; member=Pair error time=1659650137.876352 sender=:1.0 -> destination=:1.96 error_name=org.bluez.Error.AlreadyExists reply_serial=11 string "Already Paired" ***Says Already Paired? How is that possible?*** method call time=1659650137.894983 sender=:1.96 -> destination=org.bluez serial=12 path=/org/bluez/hci0/dev_CC_F9_57_89_8C_2D; interface=org.freedesktop.DBus.Properties; member=Get string "org.bluez.Device1" string "Paired" method return time=1659650138.950032 sender=:1.0 -> destination=:1.96 serial=2686 reply_serial=14 variant boolean false signal time=1659650139.690503 sender=:1.0 -> destination=(null destination) serial=2687 path=/; interface=org.freedesktop.DBus.ObjectManager; member=InterfacesAdded object path "/org/bluez/hci0/dev_CC_F9_57_89_8C_2D/service000a" array [ dict entry( string "org.freedesktop.DBus.Introspectable" ... I then tried again after rebooting: method call time=1659652894.256912 sender=:1.13 -> destination=org.bluez serial=11 path=/org/bluez/hci0/dev_CC_F9_57_89_8C_2D; interface=org.bluez.Device1; member=Pair signal time=1659652896.898455 sender=:1.11 -> destination=(null destination) serial=72 path=/org/bluez/hci0/dev_CC_F9_57_89_8C_2D; interface=org.freedesktop.DBus.Properties; member=PropertiesChanged string "org.bluez.Device1" array [ dict entry( string "UUIDs" variant array [ string "00001800-0000-1000-8000-00805f9b34fb" string "00001801-0000-1000-8000-00805f9b34fb" string "0000180a-0000-1000-8000-00805f9b34fb" string "0000fe59-0000-1000-8000-00805f9b34fb" string "edf50000-681e-4b92-999c-e16b3a8bc046" string "edf50000-681e-4b92-999c-e16b3a8bc047" ] ) dict entry( string "ServicesResolved" variant boolean true ) dict entry( string "Paired" variant boolean true ) ] array [ ] method call time=1659652904.269624 sender=:1.13 -> destination=org.bluez serial=12 path=/org/bluez/hci0/dev_CC_F9_57_89_8C_2D; interface=org.freedesktop.DBus.Properties; member=Get string "org.bluez.Device1" string "Paired" method return time=1659652904.280169 sender=:1.11 -> destination=:1.13 serial=73 reply_serial=12 variant boolean true John Klug