New service UUID select

[ibrahim123]

Hi 

I am using the nrf52832 with the heart rate (freertos) example 

Let say i want to add a new service and characteristic to that service ,this service is not suppose to be in the advertising data 

What UUID  may i choose ?? as i read in the Bluetooth specs the 16bit uuid are reserved for Protocol Identifiers and companies that are interested in there own UUID 

So if i want to create a service with 16bit uuid for example : 0xAAB0 i am not allowed to do that right ?? and i need to use a 128bit uuid ?? 

Thanks a lot 

Ibrahim  

[haakonsh]

You need a 128-bit UUID unless you pay BT SIG $$$ for a 16-bit one. 

[ibrahim123]

Thanks for the answer
So if i use this function 

 sd_ble_gatts_service_add(BLE_GATTS_SRVC_TYPE_PRIMARY, &ble_uuid, &service_handle); 

the ble_uuid.uuid must represet a 128bit uuid and not (for example (0xAAA0)) ?

[haakonsh]

see sd_ble_gatts_service_add and ble_uuid_t.

You need to create a ble_uuid_t and pass it to sd_ble_gatts_service_add.

[ibrahim123]

Hi 
That what i did but the UUID field in the ble_uuid_t is a uint16 type 
And its says in the link your provided 

"16-bit UUID value or octets 12-13 of 128-bit UUID."  

So in conclusion i must send a 0xXXXX only ?

Sorry i am just a little lost 

I did create a  ble_uuid_t bleuuid;

bleuuid.uuid = 0xAAAA;(for example)

Is that Ok or do i have to pay for this ?   

[haakonsh]

The type field must be BLE_UUID_TYPE_VENDOR_BEGIN, see Types of UUID. 

The UUID field must be: 16-bit UUID value or octets 12-13 of 128-bit UUID.


Octet 12-13 is used as a shorthand to identify the Service, your characteristics UUID are usually based on the last 4 octets of the 128 bit UUID. 

[ibrahim123]

Thanks a lot