SDK15.0 BLE host client

[helen]

Hi,Sir：

 

I am making a DEMO based on SDK15.0(SDK15.0\examples\ble_central\ble_app_hrs_c) and pca10056 for my one of important customs.I need to implement some extra software features as flowing:

• implement BLE host client that can find a peripheral all services include SIG service and private service(this function seems as PC /Android’s nRF connect) .
• The BLE host client can find corresponding characteristics and  of the peripheral service.

 

For BLE SIG services, I can register them in advance one by one through uint32_t ble_db_discovery_evt_register(ble_uuid_t const * p_uuid) function,then discover    services and corresponding characteristics of the services;but for private service,the user cannot know the UUID of the private service of the BLE peripheral in advance, and does not know how many private services are provided outside the BLE peripheral.

So, for the BLE host client find BLE peripheral several private services that cannot be known in advance, do you have any situation?

 

I tried to modify some code to find BLE private service:

from(SDK\nRF5_SDK_15.0.0_a53641a\examples\ble_central\ble_app_hrs_c\pca10056)as flowing:

replace

//    err_code = sd_ble_gattc_primary_services_discover(conn_handle,

//                                                      SRV_DISC_START_HANDLE,

//                                                      &(p_srv_being_discovered->srv_uuid));

with

    err_code = sd_ble_gattc_primary_services_discover(conn_handle,

    SRV_DISC_START_HANDLE,

NULL);

 

But I only get two services ，their 0x 1800和 0x1801 on on_primary_srv_discovery_rsp().

 

Attachment program and print information:

 

        p_prim_srvc_disc_rsp_evt = &(p_ble_gattc_evt->params.prim_srvc_disc_rsp);

 

        p_srv_being_discovered->srv_uuid     = p_prim_srvc_disc_rsp_evt->services[0].uuid;

        p_srv_being_discovered->handle_range = p_prim_srvc_disc_rsp_evt->services[0].handle_range;

 

        NRF_LOG_DEBUG("Current service count = %d.", p_prim_srvc_disc_rsp_evt->count);

        for(uint8_t i= 0;i< p_prim_srvc_disc_rsp_evt->count;i++)

        {

          NRF_LOG_DEBUG("Found a %d type service UUID 0x%04X", p_prim_srvc_disc_rsp_evt->services[i].uuid.type,

                                                             p_prim_srvc_disc_rsp_evt->services[i].uuid.uuid);                                                                     

          

          NRF_LOG_DEBUG("The service handle range:0x%04X--0x%04X", p_prim_srvc_disc_rsp_evt->services[i].handle_range.start_handle,

                                                                   p_prim_srvc_disc_rsp_evt->services[i].handle_range.end_handle);        

        }

 

 

<debug> ble_db_disc: Starting discovery of service with UUID 0x0 on connection handle 0x0.

<debug> ble_db_disc: Current service count = 2.

<debug> ble_db_disc: Found a 1 type service UUID 0x1800

<debug> ble_db_disc: The service handle range:0x0001--0x0009

<debug> ble_db_disc: Found a 1 type service UUID 0x1801

<debug> ble_db_disc: The service handle range:0x000A--0x000A

[run_ar]

Hi,

For most applications the 128 bit UUID is known, so you would simply add it to your list of known vendor specific UUID's. The returned uuid.type will match one of your entries in the UUID table in this case. In case the 128 bit UUID is unknown, BLE_UUID_TYPE_UNKNOWN, you can use sd_ble_gattc_attr_info_discover to discover the 128bit UUID.

[helen]

let me try this,thanks

[run_ar]

Not sure why you are talking about BLE_GATTC_EVT_REL_DISC_RSP?

1. You need to check the ble_gattc_evt_prim_srvc_disc_rsp_t

This will contain a Count and a ble_gattc_services_t structure. If you look at this structure you see it contains a ble_uuid_t structure. if this type is BLE_UUID_TYPE_UNKNOWN you need to move on to 2, and provide the handle range provided as part of the ble_gattc_evt_prim_srvc_disc_rsp_t event.

2. You are not supposed to iterate through the all the handles. Please check the handle range that is returned together with the unknown UUID type.

[helen]

OK, I will retest that in SDK15.2，Thanks！

[run_ar]

Good luck, let me know if you have any further questions.

[jimmy]

Hello there:
I have the same problem as you now, can you please tell me how to handle it, I tried to execute sd_ble_gattc_attr_info_discover () on BLE_GATTC_EVT_PRIM_SRVC_DISC_RSP, but the type returned by BLE_GATTC_EVT_EVT_ATTR_INFO_DISC_RSC is not 128 bits. How can I solve this problem?
thanks!

[jimmy]

Hello run_ar:
I encountered a question that you answered two years ago, but using the method you said, I tried and failed. I wonder if you can provide some examples. I tried to execute sd_ble_gattc_attr_info_discover () in BLE_GATTC_EVT_PRIM_SRM_SRVC_DISC_RSP and get BLE_GATTC_EVT_EVT_ATTR_INFO_DISC_RSP event, but the type (format) does not belong to 128-bit UUID, this is the last function to be completed. Can you provide a simple example.
Thank you