I'm working on a PC application (using nrf51-ble-driver_win_0.4.1 API) to connect a BLE device and discover BLE services.
Today, I'm tying to connect the Nordic dev kit programmed with "Nordic_UART" application (providing few services).
When discovering services, one is detected with type BLE_UUID_TYPE_UNKNOWN and uuid 0, meaning it's a 128bits UUID.
Then, I use sd_ble_gattc_read to read the full 128bits address and get in return {0x9e 0xca 0xdc 0x24 0x0e 0xe5 0xa9 0xe0 0x93 0xf3 0xa3 0xb5 0x01 0x00 0x40 0x6e}. Which appears to be correct. 16bits UUID is then {0x01 0x00} (bytes 12 and 13 of 128bits address).
As all the API works with 16bits UUID, my understanding is that I need to call sd_ble_uuid_vs_add to add a mapping between 16bits UUID {0x01 0x00} and 128bits UUID {0x9e 0xca 0xdc 0x24 0x0e 0xe5 0xa9 0xe0 0x93 0xf3 0xa3 0xb5 0x01 0x00 0x40 0x6e} for any future function call of the API with 16bits UUID to work. Is that true?
Then, I do:
uint8_t p_type;
uint32_t err_code = sd_ble_uuid_vs_add( &uuid128, &p_type ); // uuid128 storing the 128bits array read by sd_ble_gattc_read
This returns NRF_SUCCESS and p_type is set to BLE_UUID_TYPE_VENDOR_BEGIN so it apparently worked.
By the way, I saw examples where uuid128[12] and uuid128[13] are set to 0x00 before calling sd_ble_uuid_vs_add (to "Mask 16-bit UUID part to zeros")....am I supposed to do that?
Now, later in my code, when I display UUID to user, I'd like to convert back the 16bits UUID ({0x01 0x00}) to the long 128bits UUID. My undesrtanding is that it should be doable without using again sd_ble_gattc_read as mapping between both was added to the system when I called sd_ble_uuid_vs_add. Is that true?
So I try that:
ble_uuid_t ble_uuid;
ble_uuid.type = BLE_UUID_TYPE_VENDOR_BEGIN;
ble_uuid.uuid = 0x0001;
uint8_t len = 0;
ble_uuid128_t restored128;
sd_ble_uuid_encode(&ble_uuid, &len, restored128.uuid128);
This returns me NRF_SUCCESS, which is good. But len remains 0 and restored128.uuid128 is unchanged. Moreover, log_handler is invoked with sd_rpc_log_severity_t of LOG_ERROR and message File: (null), Line: 0, Error code: 12.
Shouldn't I get len == 16 and restored128.uuid128 set to {0x9e 0xca 0xdc 0x24 0x0e 0xe5 0xa9 0xe0 0x93 0xf3 0xa3 0xb5 0x01 0x00 0x40 0x6e}?
Am I misunderstanding something?
Note: This question could be a duplicate as this one posted by me but as I could not get any answer, I'm giving a new try explainging the problem differently... ;-)
