【Ask SORACOM Vol.13】実測！M5Stack Basic のフラッシュメモリ使用量を 50% 削減できる SORACOM 活用術

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/*
   Example | AWS IoT Core's Device shadow implementation on M5Stack Basic/Gray
   Copyright SORACOM
   This software is released under the MIT License, and libraries used by these sketches 
   are subject to their respective licenses.
   https://opensource.org/licenses/mit-license.php
*/
static const char _VERSION_[] = "deviceshadow-wifi-0.9";
static const char DEVICE_ID_PREFIX[] = "m5stack";
static const char THING_NAME[] = "mcu1";
static const char SHADOW_NAME[] = "peripheral";
#include <M5Stack.h>
static const char TAG[] = "TAG"; // for ESP_LOG*
#include <WiFiClientSecure.h>
#include <WiFi.h>
static const char WIFI_SSID[] = "xxxxx";
static const char WIFI_PASSWORD[] = "xxxxx";
WiFiClientSecure ctx;
static const char rootCA[] PROGMEM = \
"-----BEGIN CERTIFICATE-----\n"
// ルート証明書
"-----END CERTIFICATE-----\n";
static const char certificate[] PROGMEM = \
"-----BEGIN CERTIFICATE-----\n"
// X.509 証明書
"-----END CERTIFICATE-----\n";
static const char privateKey[] PROGMEM = \
"-----BEGIN RSA PRIVATE KEY-----\n"
// 証明書の秘密鍵
"-----END RSA PRIVATE KEY-----\n";
#include <ArduinoJson.h>
#include <vector>
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/*
   Example | AWS IoT Core's Device shadow implementation using SORACOM Beam on M5Stack Basic/Gray + SORACOM Air(3G ext. board)
   Copyright SORACOM
   This software is released under the MIT License, and libraries used by these sketches 
   are subject to their respective licenses.
   https://opensource.org/licenses/mit-license.php
*/
static const char _VERSION_[] = "deviceshadow-3G+Beam-0.9";
static const char DEVICE_ID_PREFIX[] = "m5stack";
static const char THING_NAME[] = "mcu1";
static const char SHADOW_NAME[] = "peripheral";
#include <M5Stack.h>
static const char TAG[] = "TAG"; // for ESP_LOG*
#define SerialAT Serial2 // Serial2 is 3G ext. module
#define TINY_GSM_MODEM_UBLOX
#include <TinyGsmClient.h>
TinyGsm modem(SerialAT);
TinyGsmClient ctx(modem);
#include <ArduinoJson.h>
#include <vector>
#include <PubSubClient.h>
PubSubClient MqttClient;
static const char mqtt_server_address[] = "beam.soracom.io";
static const uint16_t mqtt_server_port = 1883;
struct Shadow {
  uint32_t version = 0;
  char reported[256];
  char update_delta[256];
  char get[256];
  char get_accepted[256];
};
struct Shadow shadow;
// Take the PositionMachine as an example.
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