I have NRF5252840-DK (evaluation board, SDK 15.3.0, S140) acting as central. It correctly scans advertising data from my peripheral - custom board with NRF52811 (same SDK, based on Beacon project, but with added capability to connect and with added custom service and characteristics with 128b UUID).
My central (NRF5252840-DK ) can correctly connect to peripheral, and with
err_code=ble_db_discovery_start(&m_db_disc, p_gap_evt->conn_handle);
I can discover my service, and my two custom characteristics although it takes a while (about 50 seconds). Then I find myself in db_disc_handler, with event type BLE_DB_DISCOVERY_COMPLETE.
* @param[in] p_event Pointer to the database discovery event.
*/
static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
{
ret_code_t err_code;
NRF_LOG_INFO("db_disc_handler");
if(p_evt->evt_type==BLE_DB_DISCOVERY_COMPLETE)
{
NRF_LOG_INFO("Discovered");
ble_gatts_value_t temp;
memset(&temp, 0, sizeof(ble_gatts_value_t));
memset(&temp, 0, sizeof(my_value_arr));
temp.p_value = &my_value_arr[0];
temp.len = 3;
temp.offset = 0;
err_code = sd_ble_gatts_value_get(p_evt->conn_handle, p_evt->params.discovered_db.charateristics[0].characteristic.handle_value, &temp); // 0x00D
APP_ERROR_CHECK(err_code);
}
Characteristics can be read (0x01 in p_evt->params.discovered_db.characteristics[0].characteristic.char_props.read), and I can read their values by my phone app. UUID for characteristic is correct. I did not get any disconnect event, but sd_ble_gatts_value_get returns error 5 (NRF_ERROR_NOT_FOUND?). What might be interesting is that p_evt->params.err_code is equal to 0x00021400. Does that have anything to do with RAM? I already modified my linker in SES v4.20a to:
RAM_START=0x20001f10 RAM_SIZE=0x3e330
I should also mention, that I tried to read characteristic with sd_ble_gattc_read();, and it did not trow any errors, but p_evt->evt_id == BLE_GATTC_EVT_READ_RSP in gatt_evt_handler was never true. I'm new to NRF52, so I might have missed something obvious, but I spent hours reading forums, and examples so I would be very grateful for help.
