Hi Joe,
On Tue, May 3, 2016 at 6:38 PM, Joe Glancy <joe.t.glancy@xxxxxxxxx> wrote:
> Hello all.
>
> I was wondering whether someone could possibly help shine some light on an
> issue I'm having.
>
> Here's the setup:
> - Ubuntu 16.04 w/Bluez 5.37 (from the official repos, experimental mode
> enabled)
> - BBC micro:bit
> - "hciconfig -a hci0":
> hci0: Type: BR/EDR Bus: USB
> BD Address: XX:XX:XX:XX:XX:XX ACL MTU: 1022:8 SCO MTU: 183:5
> UP RUNNING PSCAN
> RX bytes:718 acl:0 sco:0 events:54 errors:0
> TX bytes:3731 acl:0 sco:0 commands:54 errors:0
> Features: 0xff 0xfe 0x0d 0xfe 0xd8 0x7f 0x7b 0x8f
> Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3
> Link policy: RSWITCH HOLD SNIFF
> Link mode: SLAVE ACCEPT
> Name: 'Io'
> Class: 0x4c010c
> Service Classes: Rendering, Capturing, Telephony
> Device Class: Computer, Laptop
> HCI Version: 4.1 (0x7) Revision: 0x3101
> LMP Version: 4.1 (0x7) Subversion: 0x1
> Manufacturer: Atheros Communications, Inc. (69)
>
> What I am trying to do:
> - Read some bytes from a characteristic on the micro:bit through BlueZ's
> DBUS API using a Python script and the dbus module
>
> The error I am getting:
> - "org.bluez.Error.NotPermitted: Not paired"
>
> I have paired the micro:bit both from the normal Ubuntu Bluetooth settings
> menu, and I have also paired it with the bluetoothctl tool, each on separate
> occasions. Both reported that the pair was successful (no pin was required
> however, compared to when I pair the micro:bit to my phone I do need the
> pin), however when I tried running my script (which does not check whether
> the device is paired or connected: this is performed by the user, and I can
> verify that both the Ubuntu settings and bluetoothctl reported it as both
> paired and connected), I get the afore mentioned error
> ("org.bluez.Error.NotPermitted: Not paired").
case BT_ATT_ERROR_AUTHENTICATION:
case BT_ATT_ERROR_INSUFFICIENT_ENCRYPTION:
case BT_ATT_ERROR_INSUFFICIENT_ENCRYPTION_KEY_SIZE:
return btd_error_not_permitted(msg, "Not paired");
So any of these errors could be causing the problem, perhaps it is the
device that requires higher security.
> Is this, therefore, an error with my program (I have spent hours checking it
> and cannot find any errors)? Or a possible bug with BlueZ? There are very
> few resources online for this kind of thing so I ended up resorting to the
> Bluetooth mailing list - please notify me if this is the wrong kind of stuff
> to be asking.
>
> The micro:bit is the only LE device which has ever connected to this
> (laptop) computer, and the characteristic (and its service) which I am
> reading from do both exist as DBUS objects. My grasp of the DBUS system is
> rather rudimentary, and so far has just been gained from BlueZ examples.
>
> I have checked using the DBUS API to make sure that the device is both
> paired and connected - both said yes, but, as previously said I get an error
> (more specifically, an exception is thrown when I try to call "<DBUS
> interface to characteristic>.ReadValue()").
How you are actually testing this, perhaps you should try using bluetoothctl:
> agent on
> default-agent
> pair <address>
> select-attribute <object>
> read
> Is this my doing, or an issue with something out of my control? Any help
> will be appreciated :)
> --
> To unsubscribe from this list: send the line "unsubscribe linux-bluetooth"
> in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
Luiz Augusto von Dentz
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
