So I'm trying to write a value to a characteristic I have set up as in the code below (figure 1), using the code further below (figure 2).
The sd_ble_gatts_hvx call is coming back with BLE_ERROR_GATTS_SYS_ATTR_MISSING. I've read here
that this is perhaps normally handled with the BLE_GATTS_EVT_SYS_ATTR_MISSING event, and I'm supposed to make a call like I have in my figure 3 below.
However, this event is not being called. I'm not sure if that's the cause of my error.
So, is there something wrong with my setup, my write, or have I somehow misrouted my event handling of BLE_GATTS_EVT_SYS_ATTR_MISSING?
(I have refactored quite a bit from the example, may have broken something.)
Thanks for any help!
Figure 1: setting up the characteristic
//////////////////////////////////////////
// Add State characteristic BLE_UUID_SMILE_STATE
//////////////////////////////////////////
memset(&add_char_params, 0, sizeof(add_char_params));
add_char_params.uuid = BLE_UUID_SMILE_STATE;
add_char_params.uuid_type = service_uuid.type;
add_char_params.max_len = 10;
add_char_params.init_len = sizeof(uint8_t);
add_char_params.is_var_len = true;
add_char_params.char_props.broadcast = 0;
add_char_params.char_props.read = 1;
add_char_params.char_props.write_wo_resp = 0;
add_char_params.char_props.write = 0;
add_char_params.char_props.notify = 1;
add_char_params.char_props.indicate = 0;
add_char_params.char_props.auth_signed_wr = 0;
add_char_params.read_access = SEC_OPEN;
add_char_params.write_access = SEC_OPEN;
add_char_params.cccd_write_access = SEC_OPEN;
err_code = characteristic_add(p_our_service->service_handle, &add_char_params,&(p_our_service->characteristichandles_State));
if (err_code != NRF_SUCCESS) { RETURN_FAULT(10,err_code)
Figure 2: code that writes
uint16_t length = 10;
uint8_t state_bytes[10];
state_bytes[0] = 0xFF & (state >> 8);
state_bytes[1] = 0xFF & (state >> 0);
ble_gatts_hvx_params_t hvx_params;
memset(&hvx_params, 0, sizeof(hvx_params));
hvx_params.handle = m_our_service.characteristichandles_State.value_handle;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
hvx_params.offset = 0;
hvx_params.p_len = &length;
hvx_params.p_data = state_bytes;
uint32_t err_code = sd_ble_gatts_hvx( m_conn_handle, &hvx_params);
Figure 3: my handler for BLE_ERROR_GATTS_SYS_ATTR_MISSING
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
uint32_t err_code;
switch (p_ble_evt->header.evt_id)
{
// ...
case BLE_GATTS_EVT_SYS_ATTR_MISSING:
UART_SendString("[BLE event: BLE_GATTS_EVT_SYS_ATTR_MISSING]");
// No system attributes have been stored.
err_code = sd_ble_gatts_sys_attr_set(m_conn_handle, NULL, 0, 0);
APP_ERROR_CHECK(err_code);
break;
}
}
