change UUID

[Kangtae]

Good morning.
I am studying an example with nrf52840 DK.
In the ble_app_multilink_central example, I want to try to change the UUID because I want to try to attach BLE from another company, but I don't know which part to modify. The format is also different.
The UUID you want to change is
Service UUID: 49535343FE7D4AE58FA99FAFD205E455
Characteristics tx: 495353431E4D4BD9BA6123C647249616
Characteristics rx: 49535343884143F4A8D4ECBE34729BB3
is.
In the example, only 16 bits are changed in the middle of the base UUID.
The UUIDs I want to change are all different formats so I don't know where to change them.
This is a basic question, but please let me know. Thank you.

[Amanda Hsieh]

Hi, 

If you want to change 128bit freely, you will have to change the Base UUID. Take a look at this under Universally Unique ID (UUID). 

 You need multiple base UUIDs if you are not changing the octets used for the 16/32 bit service UUID. But you also need to specify the 16 bit part. 

sd_ble_gatts_service_add() - requires pointer to 16 -bit uuid with uuid.type referencing the base uuid. 

Please also see API doc for sd_ble_uuid_vs_add:

octet 12 and 13 of the base uuid will be ignored so those need to be specified when you add services/characteristics. 

-Amanda H