[nRF8001] CCCD has no Write permission

[Michiel Lowijs]

I added a local service with a characteristic with the Notify permission set. On the device I'm connecting from to the nRF8001, I can see my custom characteristic has a 0x2902 (CCCD) descriptor. However, it has no permissions enabled, and thus I cannot write to it to enable notifications. If I try anyway, I don't get a PipeStatusEvent on the nRF8001.

The devices are not paired (using Bond), but only connected (using Connect).

What is wrong with my setup?

[run_ar]

What is your security settings? Is is possible for you to upload your configuration XML here?

[Michiel Lowijs]

Security is off.

Attached the XML below!

LaserTag.xml

[run_ar]

Hi,

I cannot see anything in particular that is wrong with your setup, except that you are using the Bluetooth Base UUID. For proprietary services it is recommended that you use a proprietary base UUID instead. This can be generated in nRFgo studio. It would also make sense to add this UUID to the advertisement packer so you can see which services is on a device before connecting to it. However this wouldn't fix your problem of not being able to write to the CCCD. What peer device are you using to test this? Have you tried using the master control panel?

Best regards,

[Michiel Lowijs]

I tried changing the UUID of my service and characteristic to a custom base UUID, but this caused my peer device to not discover any services on the nRF8001, not even the GAP.

I wanted to add the services to the advertisement packet but nRFgo Studio told me this is only for nRF8001 D devices (mine is a C).

What is the master control panel?

The device is a Google Nexus 5 running Android 4.4.2.

[David Edwin]

When you generate your settings from the nRFgo studio, you will also get a ublue_setup.gen.out.txt from the nRFgo studio. Can you attach that file as well.