128-bit Characteristic UUID not based on Service UUID

Question

Hi Nordic Team, 
 What I want to achieve is to add a service with a custom 128-bit UUID that has about 4 characteristics with a completely different 128-bit UUIDs that are NOT based on the service UUID ? 
 Is that possible ? If so, how can I implement that? I'm using SDK12.2.0 on nRF51822. 
 Many thanks in advance. 
 Kind Regards,
Ayman.

Hannu Hirvonen · Answer

Hello, 
 I have exactly same problem (or is this challenge). If you have some code example how to do this I will be very happy :)

Andy · Answer

It is fairly easy to do. You just need to add a new 128-bit UUID to the BLE stack table and then add a service/characteristic with that UUID. // To add a service
// Declare 16-bit service and 128-bit base UUIDs and add them to BLE stack table
ret_code_t	err_code;
ble_uuid_t	service_uuid;

BLE_UUID_BLE_ASSIGN(service_uuid, your_16_bit_uuid);

ble_uuid128_t base_uuid = YOUR_CUSTOM_128_BIT_UUID;

// Add the UUID to the BLE stack
err_code = sd_ble_uuid_vs_add(&base_uuid, &service_uuid.type);
APP_ERROR_CHECK(err_code);

// Add your service
err_code = sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY,
 &service_uuid,
 &service_handle);
APP_ERROR_CHECK(err_code);
 
 // To add a characteristic
// Add a custom characteristic UUID
ret_code_t err_code;
ble_uuid_t char_uuid;
BLE_UUID_BLE_ASSIGN(char_uuid, your_16_bit_uuid);

ble_uuid128_t base_uuid = YOUR_CUSTOM_128_BIT_UUID;

// Add the UUID to the BLE stack
err_code = sd_ble_uuid_vs_add(&base_uuid, &char_uuid.type);
APP_ERROR_CHECK(err_code);

[Initialize all attribute metadata and stuff]
[Copy from any example]

// Add our new characteristic to the service
err_code = sd_ble_gatts_characteristic_add(service_handle,
 &char_md,
 &attr_char_value,
 &custom_char_handles);
APP_ERROR_CHECK(err_code);

128-bit Characteristic UUID not based on Service UUID

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