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").
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()").
Is this my doing, or an issue with something out of my control? Any help
will be appreciated :)
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