Function esp_idf_svc::sys::nvs_set_blob

pub unsafe extern "C" fn nvs_set_blob(
    handle: u32,
    key: *const i8,
    value: *const c_void,
    length: usize,
) -> i32

@brief set variable length binary value for given key

Sets variable length binary value for the key. Function uses 2 overhead and 1 entry per each 32 bytes of new data from the pool of available entries. See \c nvs_get_stats . In case of value update for existing key, space occupied by the existing value and 2 overhead entries are returned to the pool of available entries. Note that the underlying storage will not be updated until \c nvs_commit is called.

@param[in] handle Handle obtained from nvs_open function. Handles that were opened read only cannot be used. @param[in] key Key name. Maximum length is (NVS_KEY_NAME_MAX_SIZE-1) characters. Shouldn’t be empty. @param[in] value The value to set. @param[in] length length of binary value to set, in bytes; Maximum length is 508000 bytes or (97.6% of the partition size - 4000) bytes whichever is lower.

@return - ESP_OK if value was set successfully - ESP_FAIL if there is an internal error; most likely due to corrupted NVS partition (only if NVS assertion checks are disabled) - ESP_ERR_NVS_INVALID_HANDLE if handle has been closed or is NULL - ESP_ERR_NVS_READ_ONLY if storage handle was opened as read only - ESP_ERR_NVS_INVALID_NAME if key name doesn’t satisfy constraints - ESP_ERR_NVS_NOT_ENOUGH_SPACE if there is not enough space in the underlying storage to save the value - ESP_ERR_NVS_REMOVE_FAILED if the value wasn’t updated because flash write operation has failed. The value was written however, and update will be finished after re-initialization of nvs, provided that flash operation doesn’t fail again. - ESP_ERR_NVS_VALUE_TOO_LONG if the value is too long