nvs_blob.h File Reference

One read sequence for fixed-size blobs in NVS, shared by the calibration and WiFi stores (device only). More...

#include <Preferences.h>
#include <cstddef>
#include <cstdint>
#include <span>

Go to the source code of this file.

Enumerations
enum class	nvs_blob::ReadStatus { Absent , Mismatch , Ok }
	Outcome of read(). More...

Functions
ReadStatus	nvs_blob::read (Preferences &prefs, const char *key, std::span< uint8_t > out)
	Reads the blob under key into out, requiring the stored length to equal out.size().

Detailed Description

One read sequence for fixed-size blobs in NVS, shared by the calibration and WiFi stores (device only).

Enumeration Type Documentation

ReadStatus

enum class nvs_blob::ReadStatus

strong

Outcome of read().

Enumerator
Absent	the key does not exist (stored length 0)
Mismatch	stored with a different length than expected, or the read came back short
Ok	out holds exactly the stored bytes

Function Documentation

read()

ReadStatus nvs_blob::read ( Preferences & prefs, const char * key, std::span< uint8_t > out )

inline

Reads the blob under key into out, requiring the stored length to equal out.size().

Same sequence the stores used inline: length query, size check, then the read with a size check.