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Subject: Re: bluetoothctl: list-attributes doesn't list services from
 example-gatt-server
From:   =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>
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Date:   Wed, 17 Jul 2019 11:38:21 +0200
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On 09.07.2019 14:14, Rafał Miłecki wrote:
> On 07.07.2019 12:14, Rafał Miłecki wrote:
>> I decided to test GATT. On elitebook I started:
>> ./test/example-gatt-server
>> and waited to let matebook refresh all info.
>>
>> After that I got:
>>
>> [elitebook]# info 20:16:B9:D8:A9:3B
>> Device 20:16:B9:D8:A9:3B (public)
>>          Name: elitebook
>>          Alias: elitebook
>>          Class: 0x001c010c
>>          Icon: computer
>>          Paired: yes
>>          Trusted: yes
>>          Blocked: no
>>          Connected: yes
>>          LegacyPairing: no
>>          UUID: IrMC Sync                 (00001104-0000-1000-8000-00805f9b34fb)
>>          UUID: OBEX Object Push          (00001105-0000-1000-8000-00805f9b34fb)
>>          UUID: OBEX File Transfer        (00001106-0000-1000-8000-00805f9b34fb)
>>          UUID: Headset                   (00001108-0000-1000-8000-00805f9b34fb)
>>          UUID: Audio Source              (0000110a-0000-1000-8000-00805f9b34fb)
>>          UUID: Audio Sink                (0000110b-0000-1000-8000-00805f9b34fb)
>>          UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
>>          UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
>>          UUID: Headset AG                (00001112-0000-1000-8000-00805f9b34fb)
>>          UUID: Phonebook Access Server   (0000112f-0000-1000-8000-00805f9b34fb)
>>          UUID: Message Access Server     (00001132-0000-1000-8000-00805f9b34fb)
>>          UUID: Message Notification Se.. (00001133-0000-1000-8000-00805f9b34fb)
>>          UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
>>          UUID: Heart Rate                (0000180d-0000-1000-8000-00805f9b34fb)
>>          UUID: Battery Service           (0000180f-0000-1000-8000-00805f9b34fb)
>>          UUID: Vendor specific           (00005005-0000-1000-8000-0002ee000001)
>>          UUID: Vendor specific           (12345678-1234-5678-1234-56789abcdef0)
>>          Modalias: usb:v1D6Bp0246d0532
>>
>> That seems all correct for now. Test example-gatt-server registers
>> Heart Rate, Battery & Test services. All of them appeared as expected.
>>
>> My problem is that I can't list GATT attributes. I don't any output.
>> Is there anything I'm doing incorrectly?
> 
> I decided to test nRF Connect Android app. It showed something
> interesting about my bluetooth devices. It nicely displays & parses
> advertising data.
> 
> Logitech M590 advertises:
> 0x01 Flags
> 0x03 Complete List of 16-bit Service Class UUIDs
> 0x09 Complete Local Name
> 0x0A Tx Power Level
> 0x19 Appearance
> 
> BlueZ on "elitebook" advertises:
> 0xFF Manufacturer Specific Data
> or to say precisely:
> 0x1BFF750042040180AE78BDBC0B7E307ABDBC0B7E2F01000000000000
> 
> Any idea/hint why BlueZ 5.30 on my "elitebook" notebook doesn't
> advertise more data?

I've discovered I also need to run test/example-advertisement. Then I
can see my notebook advertise UUIDs and characteristics. It seems that
test/example-gatt-server is insufficient on its own.