Hi Ryan, On Thu, Mar 4, 2021 at 11:10 AM Ryan Walmsley <ryan@xxxxxxxxxxxxx> wrote: > > Hi, > > We've been working on something that uses Bluetooth to provide GATT > services and recently have updated to BlueZ 5.55 from 5.53 and have > found an issue. > > It seems that in the newer version a commit was made > (d5e07945c4aa36a83addc3c269f55c720c28afdb) that enabled the service > 0x180A with characteristic 0x2A50. Yep, DIS is controlled by the daemon since you can set the vendor, product and version using main.conf. > However as our software creates a service on 0x180A it causes a > conflict, as the application we are making our software with reads > from the first service available which is the one generated by BlueZ. You should probably stop doing that and just use main.conf to set the values you want to be published, we should actually blacklist DIS to be registered by applications since that is defined by the platform having the application to override may actually cause problems. > It looks like it was discussed about a kill switch being added of > "DeviceIdOverLE" to then disable this but I can't find any reference > to this at all. > > How would be best to disable this? Disable DIS on the application, you can actually check if the adapter has enabled it already using its UUIDs: https://git.kernel.org/pub/scm/bluetooth/bluez.git/tree/doc/adapter-api.txt#n321 bluetoothctl also can be use to print the list of UUIDs that the adapter is exposing (0000180a-0000-1000-8000-00805f9b34fb is DIS): [bluetooth]# show Controller 00:AA:01:01:00:24 (public) Name: Alias: Class: 0x00000000 Powered: no Discoverable: no DiscoverableTimeout: 0x000000b4 Pairable: yes UUID: Message Notification Se.. (00001133-0000-1000-8000-00805f9b34fb) UUID: A/V Remote Control (0000110e-0000-1000-8000-00805f9b34fb) UUID: OBEX Object Push (00001105-0000-1000-8000-00805f9b34fb) UUID: Message Access Server (00001132-0000-1000-8000-00805f9b34fb) UUID: PnP Information (00001200-0000-1000-8000-00805f9b34fb) UUID: IrMC Sync (00001104-0000-1000-8000-00805f9b34fb) UUID: Headset (00001108-0000-1000-8000-00805f9b34fb) UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb) UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb) UUID: Phonebook Access Server (0000112f-0000-1000-8000-00805f9b34fb) UUID: Audio Sink (0000110b-0000-1000-8000-00805f9b34fb) UUID: Device Information (0000180a-0000-1000-8000-00805f9b34fb) UUID: Generic Access Profile (00001800-0000-1000-8000-00805f9b34fb) UUID: Headset AG (00001112-0000-1000-8000-00805f9b34fb) UUID: Audio Source (0000110a-0000-1000-8000-00805f9b34fb) UUID: OBEX File Transfer (00001106-0000-1000-8000-00805f9b34fb) Modalias: usb:v1D6Bp0246d0538 Discovering: no Roles: central Roles: peripheral Advertising Features: ActiveInstances: 0x00 (0) SupportedInstances: 0x01 (1) SupportedIncludes: tx-power SupportedIncludes: appearance SupportedIncludes: local-name SupportedSecondaryChannels: 1M SupportedSecondaryChannels: 2M SupportedSecondaryChannels: Coded > -- > Ryan Walmsley > > Engineer > > Pi Supply Unit 4 Bells Yew Green Business Court, > Bells Yew Green, East Sussex, TN3 9BJ, United Kingdom -- Luiz Augusto von Dentz
