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Re: Unable to Discover Generic Access Service (0x1800)
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Re: Unable to Discover Generic Access Service (0x1800)

  • Subject: Re: Unable to Discover Generic Access Service (0x1800)
  • From: Christopher Cotton <email@hidden>
  • Date: Tue, 09 Feb 2016 16:18:55 -0600
At Miselu, to work around the issue on iOS we ended up supporting another custom characteristic that we could use to update the name. But, we also supported writing to the device name since you could change it via Android. And since, we had a MIDI device, we also had a special SysEx you could send to change the name. Also, UTF8 and emoji are supported in the device name which makes for interesting logging.

On Tue, Feb 9, 2016 at 3:57 PM, Alex.SneedMiller <email@hidden> wrote:

Hi Jason,

 

Are there other Services that Apple hides from app developers? Is this documented anywhere?

 

Do you know what the reasoning behind specifically blocking that UUID is? Should I be trying to develop a product that does not allow the name to be changed? (note that I do not want to change the name just in the app, but actually do a BLE write to that characteristic, which the firmware will then parse and update the name to be)

 

Thanks,

Alex

 

From: Jason Conn [mailto:email@hidden]
Sent: Tuesday, February 09, 2016 3:43 PM


To: Alex.SneedMiller <email@hidden>
Cc: email@hidden
Subject: Re: Unable to Discover Generic Access Service (0x1800)

 

The device’s GAP name is automatically read by the system upon connection and is accessible via the CBPeripheral object. 

 

Unfortunately, it’s not currently possible to change it - please file an enhancement request if that’s something you’d like to do.

 

 

On Feb 9, 2016, at 1:37 PM, Alex.SneedMiller <email@hidden> wrote:

 

Hi Jason,

 

Why does iOS not expose that service to CB? Are there other services that are hidden as well? Perhaps this is documented somewhere and I just missed it?

 

We’d like to be able to read the name of the device that way, and update the name through a write to that characteristic.

 

Thanks,

Alex

 

From: Jason Conn [mailto:email@hidden] 
Sent: Tuesday, February 09, 2016 3:27 PM
To: Alex.SneedMiller <email@hidden>
Cc: email@hidden
Subject: Re: Unable to Discover Generic Access Service (0x1800)

 

Hi Alex,

 

iOS does not expose the GAP service directly to CoreBluetooth clients - what, specifically, do you want to do with it?

 

 

On Feb 9, 2016, at 1:14 PM, Alex.SneedMiller <email@hidden> wrote:

 

Hello,

 

I have an embedded device that exposes the Generic Access Service (UUID=0x1800 https://developer.bluetooth.org/gatt/services/Pages/ServiceViewer.aspx?u=org.bluetooth.service.generic_access.xml), and the device_name Characteristic (UUID=0x2A00 https://developer.bluetooth.org/gatt/characteristics/Pages/CharacteristicViewer.aspx?u=org.bluetooth.characteristic.gap.device_name.xml). 

 

When we discover all of the services (by passing ‘nil’ as the argument to `func discoverServices(_ serviceUUIDs: [CBUUID]?)`) and print them out we see all of the Services except for 0x1800.  When I use a BLE dongle on my laptop or an Android phone I am able to discover that Service and the Characteristics under it.  I have seen other apps also not show the Generic Access Service (0x1800).  Is there a way to discover this Service (and the Characteristics under it) so that we may read and write to the Characteristics?

 

Thanks,

Alex

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References: 
 >Unable to Discover Generic Access Service (0x1800) (From: "Alex.SneedMiller" <email@hidden>)
 >Re: Unable to Discover Generic Access Service (0x1800) (From: Jason Conn <email@hidden>)
 >RE: Unable to Discover Generic Access Service (0x1800) (From: "Alex.SneedMiller" <email@hidden>)
 >Re: Unable to Discover Generic Access Service (0x1800) (From: Jason Conn <email@hidden>)
 >RE: Unable to Discover Generic Access Service (0x1800) (From: "Alex.SneedMiller" <email@hidden>)

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