Function openthread_sys::otPlatSettingsGet

pub unsafe extern "C" fn otPlatSettingsGet(
    aInstance: *mut otInstance,
    aKey: u16,
    aIndex: c_int,
    aValue: *mut u8,
    aValueLength: *mut u16
) -> otError

Fetches the value of a setting.

Fetches the value of the setting identified by @p aKey and write it to the memory pointed to by aValue. It then writes the length to the integer pointed to by @p aValueLength. The initial value of @p aValueLength is the maximum number of bytes to be written to @p aValue.

Can be used to check for the existence of a key without fetching the value by setting @p aValue and @p aValueLength to NULL. You can also check the length of the setting without fetching it by setting only aValue to NULL.

Note that the underlying storage implementation is not required to maintain the order of settings with multiple values. The order of such values MAY change after ANY write operation to the store.

@param[in] aInstance The OpenThread instance structure. @param[in] aKey The key associated with the requested setting. @param[in] aIndex The index of the specific item to get. @param[out] aValue A pointer to where the value of the setting should be written. May be set to NULL if just testing for the presence or length of a setting. @param[in,out] aValueLength A pointer to the length of the value. When called, this pointer should point to an integer containing the maximum value size that can be written to @p aValue. At return, the actual length of the setting is written. This may be set to NULL if performing a presence check.

@retval OT_ERROR_NONE The given setting was found and fetched successfully. @retval OT_ERROR_NOT_FOUND The given setting was not found in the setting store. @retval OT_ERROR_NOT_IMPLEMENTED This function is not implemented on this platform.