about UUID

[hunter]

Is it possible to make a services like this： services UUID : 55550001-5555-5555-5555-55555555555 characteristic UUID : 55550001-4444-4444-4444-444444444444

[Pål Håland]

Hi Hunter,

It is possible to create a service with characteristics like that, but the recommended way is to create a base UUID at www.itu.int/.../generate_uuid.aspx (so that you get a unique UUID) or you can generate it based on www.itu.int/.../X.667-E.pdf.

When you have generated it, you can use the function call sd_ble_uuid_vs_add.

Example:

Generated UUID 7298d7a0-0c38-11e6-ac45-0002a5d5c51b

ble_uuid128_t vs_uuid = 
    {0x1b, 0xc5, 0xd5, 0xa5, 0x02, 0x00, 0x45, 0xac, 0xe6, 0x11, 0x38, 0x0c, 0x0, 0x0, 0x98, 0x72};
// Notice that byte [12-13] is set to 0 instead of 0xd7a0, 
// this is because the this array is stored and then combined with the ble_uuid_t type.
uint8_t vs_uuid_id;

uint32_t errcode = sd_ble_uuid_vs_add(vs_uuid, &vs_uuid_id);

// Now you can use this uuid for a service
ble_uuid_t my_uuid = {0x0001, vs_uuid_id};
errcode = sd_ble_gatts_service_add(type, &my_uuid, &handle);
// Service UUID read from peer 72980001-0c38-11e6-ac45-0002a5d5c51b

my_uuid.uuid = 0x0003; //Change the UUID for the characteristic
ble_gatts_attr_t my_attr;
my_attr.p_uuid = &my_uuid;
errcode = sd_ble_gatts_characteristic_add(handle, &char_md, &attr_md, &char_handles);
// Characteristic UUID read from peer 72980003-0c38-11e6-ac45-0002a5d5c51b

Similarily you can use the same function to create two differen vs_uuid's like you did in your question, but it is better to stick to one random generated UUID as this will kind of be your unique UUID.

[hunter]

In you way. service UUID：72980000-0c38-11e6-ac45-0002a5d5c51b characteristic UUID: 72980003-0c38-11e6-ac45-0002a5d5c51b

This is not what I want. I want this: service UUID：72980000-0c38-11e6-ac45-0002a5d5c51b characteristic UUID: 72980003-ffff-ffff-ffff-ffffffffffff I can change FFFF to anythings.

[Pål Håland]

So then you have to repeat the process of adding vs_uuid's (as mention at the bottom of the answer) This will take more space in your local database, but it is possible. Default max number of vs uuid is 10, but with the latest softdevice this can be controlled in the sd_ble_enable

[hunter]

when i repeat the process of adding vs_uuid's.useing sd_ble_uuid_vs_add and sd_ble_gatts_service_add twice.there will be two services.like this: first service UUID：72980000-0c38-11e6-ac45-0002a5d5c51b characteristic UUID: 72980003-0c38-11e6-ac45-0002a5d5c51b Second service UUID: 72980000-ffff-ffff-ffff-ffffffffffff characteristic UUID:72980003-ffff-ffff-ffff-ffffffffffff

[hunter]

i do it.need change vs_uuid_count