Can you have different base UUID for characteristics in a service?

[Ron]

I've been successfully creating custom services, but there is one case where a device has a service UUID and it's 2 characteristics have completely different UUIDs (all 128 bit). Even amongst the characteristics, the UUIDs are completely different. Though I highly doubted it, is there a way to produce this on nordic?

[run_ar]

Yes, you can use up to 10 base UUID's in the current softdevices. Just define the desired number of base UUID's and use these when initializing your services/characteristics.

[Ron]

But can you designate a base uuid for a characteristic that is different from the services it falls in?

[run_ar]

Yes, If you look at sd_ble_gatts_characteristic_add you can see there is a ble_gatts_attr_t struct. This have a struct where you can define the base UUID and octet 12-13, ble_uuid_t. This is similar to the UUID you provide to sd_ble_gatts_service_add(). The UUID type provided to the characteristic doesn't have to be the same as the one given to the service.

[MokhlesAdalia]

hi run_ar , it's been six years since this thread was responded, i still have a question though, what you said, could that be applied when in central mode?

[run_ar]

Hi,

Adding services applies to the gatt server (typically peripheral, but can also be central). But the addition og vendor specific UUID's will be similar also for the central. See sd_ble_uuid_vs_add