M5Stack5 Core2 で M5Stack Basic と同じ AWS IoT コードが動かなかったが修正できたメモ

M5Core2 initializing...axp: vbus limit off
axp: gpio1 init
axp: gpio2 init
axp: rtc battery charging enabled
axp: esp32 power voltage was set to 3.35v
axp: lcd backlight voltage was set to 2.80v
axp: lcd logic and sdcard voltage preset to 3.3v
axp: vibrator voltage preset to 2v
OK

static const char AWS_CERT_CA[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----
)EOF";

AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

static const char AWS_CERT_CA[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
-----END CERTIFICATE-----
)EOF";

#include <WiFiClient.h>
#include <WiFiClientSecure.h>
#include <PubSubClient.h>
#include <WiFi.h>
#include <WiFiMulti.h>
#include <M5Core2.h>

// Wi-Fi Settings
char *ssid = "Wi-Fi SSID";
char *password = "Wi-Fi PASSWORD";

// AWS IoT Settings
const char *endpoint = "AWS IoT Endpoint";
const int port = 8883;
char *pubTopic = "/sample123";
char *subTopic = "/sample123";

// AWS IoT Amazon Root CA 1
static const char AWS_CERT_CA[] PROGMEM = R"EOF(
-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----
)EOF";

// AWS IoT Device Certificate
static const char AWS_CERT_CRT[] PROGMEM = R"KEY(
-----BEGIN CERTIFICATE-----
-----END CERTIFICATE-----
)KEY";

// AWS IoT Device Private Key
static const char AWS_CERT_PRIVATE[] PROGMEM = R"KEY(
-----BEGIN RSA PRIVATE KEY-----
-----END RSA PRIVATE KEY-----
)KEY";

WiFiClientSecure httpsClient;
PubSubClient mqttClient(httpsClient);

WiFiMulti WiFiMulti;

void setup()
{
    M5.begin(true, true, true, true);
    
    Serial.begin(115200);  // ここをコメントアウトする
    delay(10);

    M5.Lcd.setTextColor(WHITE);
    M5.Lcd.setTextSize(2);
    M5.Lcd.clear(BLACK);
    M5.Lcd.println("begin....");
    
    Serial.println();
    Serial.println("begin....");

    // We start by connecting to a WiFi network
    WiFiMulti.addAP(ssid, password);

    M5.Lcd.println("");
    M5.Lcd.print("[Wi-Fi] ");
    Serial.println();
    Serial.println("Waiting for WiFi... ");

    while(WiFiMulti.run() != WL_CONNECTED) {
        Serial.print(".");
        delay(500);
    }
    
    Serial.println("WiFi connected");
    Serial.println("IP address: ");
    Serial.println(WiFi.localIP());
    M5.Lcd.println(" Connected.");

    //
    Serial.println("Connected.");
    Serial.println(pubTopic);
    Serial.println(subTopic);
   
    // Configure MQTT Client
    
    httpsClient.setCACert(AWS_CERT_CA);
    httpsClient.setCertificate(AWS_CERT_CRT);
    httpsClient.setPrivateKey(AWS_CERT_PRIVATE);
    mqttClient.setServer(endpoint, port);
    mqttClient.setCallback(mqttCallback);
    
    delay(500);
    
    connectAWSIoT();

    // INFO
    M5.Lcd.println("");
    M5.Lcd.printf("sub: ");
    M5.Lcd.println(subTopic);
    M5.Lcd.printf("pub: ");
    M5.Lcd.println(pubTopic);
  
}
  
void connectAWSIoT() {
  M5.Lcd.println("");
    Serial.println("connectAWSIoT");
    M5.Lcd.print("[AWS IoT] ");
    while (!mqttClient.connected()) {
      Serial.print(".");
      if (mqttClient.connect("ESP32_device")) {
          Serial.println("Connected.");
          M5.Lcd.println("Connected.");
          int qos = 0;
          mqttClient.subscribe(subTopic, qos);
          Serial.println("Subscribed.");
      } else {
          Serial.print("Failed. Error state=");
          Serial.print(mqttClient.state());
          // Wait 5 seconds before retrying
          delay(5000);
      }
    }
}
  
void mqttCallback (char* topic, byte* payload, unsigned int length) {
  
    String str = "";
    Serial.print("Received. topic=");
    Serial.println(topic);
    for (int i = 0; i < length; i++) {
        Serial.print((char)payload[i]);
        str += (char)payload[i];
    }
    Serial.print("\n");
}

void mqttLoop() {
    if (!mqttClient.connected()) {
        connectAWSIoT();
    }
    mqttClient.loop();
}

void loop() {
  mqttLoop();
}

void M5Core2::begin(bool LCDEnable, bool SDEnable, bool SerialEnable, bool I2CEnable, mbus_mode_t mode) {
  // Correct init once
  if (isInited == true) {
    return;
  } else {
    isInited = true;
  }

  // UART
  if (SerialEnable == true) {
    Serial.begin(115200);
    Serial.flush();
    delay(50);
    Serial.print("M5Core2 initializing...");
  }