event form read request

[Shimon_nohayo]

Hi,

I'm using SDK 15.2 with Nrf52832,

I've implemented a custom service with read, write and notification services.

I would appreciate if you could send me an example of how to get an event of a read request, I understand that its part of the SodtDevice and I can get authorize read event - but it is not clear how...

Shimon

[Vidar Berg]

Hi Shimon, 

Normal read requests are handled without application interaction. If you want to receive an event you need to enable authorization like you indicated (MSC). Below is a diff showing the changes needed to enable this in the ble_app_blinky_example.

Fullscreen auth_read.diff Download

diff --git a/components/ble/ble_services/ble_lbs/ble_lbs.c b/components/ble/ble_services/ble_lbs/ble_lbs.c
index 1c83a99..5324428 100644
--- a/components/ble/ble_services/ble_lbs/ble_lbs.c
+++ b/components/ble/ble_services/ble_lbs/ble_lbs.c
@@ -60,6 +60,24 @@ static void on_write(ble_lbs_t * p_lbs, ble_evt_t const * p_ble_evt)
     }
 }
 
+static void on_rw_authorize_request(ble_lbs_t * p_lbs, ble_evt_t const * p_ble_evt)
+{
+      ble_gatts_rw_authorize_reply_params_t        reply_params;
+      ble_gatts_evt_rw_authorize_request_t const * p_evt_rw_auth = &p_ble_evt->evt.gatts_evt.params.authorize_request;
+
+      memset (&reply_params, 0, sizeof(ble_gatts_rw_authorize_reply_params_t));
+
+      if ( (p_evt_rw_auth->type == BLE_GATTS_AUTHORIZE_TYPE_READ) &&
+           (p_lbs->button_char_handles.value_handle == p_evt_rw_auth->request.read.handle))
+      {
+          reply_params.type = BLE_GATTS_AUTHORIZE_TYPE_READ;
+          reply_params.params.read.gatt_status = BLE_GATT_STATUS_SUCCESS;
+
+          (void) sd_ble_gatts_rw_authorize_reply(p_ble_evt->evt.common_evt.conn_handle, &reply_params);
+          
+      }
+
+}
 
 void ble_lbs_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
 {
@@ -71,6 +89,10 @@ void ble_lbs_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
             on_write(p_lbs, p_ble_evt);
             break;
 
+        case BLE_GATTS_EVT_RW_AUTHORIZE_REQUEST:
+            on_rw_authorize_request(p_lbs, p_ble_evt);
+            break;
+
         default:
             // No implementation needed.
             break;
@@ -106,6 +128,8 @@ uint32_t ble_lbs_init(ble_lbs_t * p_lbs, const ble_lbs_init_t * p_lbs_init)
     add_char_params.max_len           = sizeof(uint8_t);
     add_char_params.char_props.read   = 1;
     add_char_params.char_props.notify = 1;
+    add_char_params.is_defered_read   = 1;
+
 
     add_char_params.read_access       = SEC_OPEN;
     add_char_params.cccd_write_access = SEC_OPEN;

If anything is unclear, let me know. 

Vidar

[ipshiv]

Good day! Do you have an example for read event on gatt client side?

I used S130 and this code worked fine:

                    ble_uuid_t m_uuid;
    				m_uuid.type = BLE_UUID_TYPE_VENDOR_BEGIN;
    				m_uuid.uuid = LGS_UUID_TYPE_CHAR;

    				ble_gattc_handle_range_t handle_range;
    				handle_range.start_handle = 0x0001;
    				handle_range.end_handle = 0xFFFF;

    				NRF_LOG_INFO("Reading....\n");
    				ret_code_t err_code = sd_ble_gattc_char_value_by_uuid_read(m_ble_lgs_c.conn_handle,
    						&m_uuid, &handle_range);
    				APP_ERROR_CHECK(err_code);

and in ble_evt_handler

case BLE_GATTC_EVT_CHAR_VAL_BY_UUID_READ_RSP: {

		
		uint8_t * ble_data_ptr =
				p_ble_evt->evt.gattc_evt.params.char_val_by_uuid_read_rsp.handle_value->p_value;
		printf("0x%x\t", *ble_data_ptr);
		printf("0x%x\r\n", *(ble_data_ptr + 1));

	}

When I migrate to S132 this part crashes with fatal error

[ref]

Sorry Vidar , I messed the name.