4000円で画面つきIoTボタンを作る（Wio Terminal）

#include <WiFiClientSecure.h>;
#include "Free_Fonts.h"  //include the header file
#include "TFT_eSPI.h"

TFT_eSPI tft;

#define RETRY_MAX 10
#define TURN_ON_MAX 50
#define AUTHORIZATION_KEY                                                      \
  "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" \
  "ffffffffffffffffffffff"
#define SWITCH_BOT_SERVER "api.switch-bot.com"
#define LIGHT_DEVICE_ID "00-000000000000-00"

const char* SSID = "<SSID>";  // your network SSID
const char* PASSWORD = "PASSWORD";  // your network password

int prev_status = 0;
int turn_on_count = 0;

WiFiClientSecure client;

const char* LIGHT_MESSAGE[2][2] = {
    {
        "Turning off the light       ",
        "Turning on the light       ",
    },
    {
        "Turned off the light       ",
        "Turned on the light       ",
    },
};

bool connect_wifi(const char* ssid, const char* password);
bool post_light_request(bool turn_on);
void lcd_backlight_on();
void lcd_backlight_update();

void setup() {
  // <lcd>
  tft.begin();
  tft.setRotation(3);

  tft.fillScreen(TFT_BLACK);
  tft.setFreeFont(
      &FreeSansBoldOblique12pt7b);  // select Free, Sans, Bold, Oblique, 12pt.
  tft.drawString("Starting...", 20, 20);  // prints string at (70,80)
  // </lcd>

  // <button>
  pinMode(WIO_KEY_A, INPUT_PULLUP);
  pinMode(WIO_KEY_B, INPUT_PULLUP);
  pinMode(WIO_KEY_C, INPUT_PULLUP);

  pinMode(WIO_5S_UP, INPUT_PULLUP);
  pinMode(WIO_5S_DOWN, INPUT_PULLUP);
  pinMode(WIO_5S_LEFT, INPUT_PULLUP);
  pinMode(WIO_5S_RIGHT, INPUT_PULLUP);
  pinMode(WIO_5S_PRESS, INPUT_PULLUP);
  // </button>

  // <serial>
  // Initialize serial and wait for port to open:
  Serial.begin(115200);
  // while(!Serial); // Wait for Serial to be ready
  // delay(1000);
  // </serial>

  // <wifi>
  if (connect_wifi(SSID, PASSWORD)) {
    Serial.print("Connected");
  }
  // </wifi>

  prev_status = -1;
}

void loop() {
  if (digitalRead(WIO_KEY_C) == LOW || digitalRead(WIO_KEY_B) == LOW) {
    bool turn_on = digitalRead(WIO_KEY_C) == LOW;
    lcd_backlight_on();

    tft.drawString(LIGHT_MESSAGE[0][turn_on], 20, 50);
    int retry_cnt = 0;
    while (retry_cnt < RETRY_MAX && !post_light_request(turn_on)) {
      retry_cnt++;
      connect_wifi(SSID, PASSWORD);
    }

    if (retry_cnt < RETRY_MAX) {
      tft.drawString(LIGHT_MESSAGE[1][turn_on], 20, 50);
    }
  }

  if (WiFi.status() != prev_status) {
    lcd_backlight_on();

    prev_status = WiFi.status();
    char str[128];
    sprintf(str, "%s (%d)", SSID, WiFi.status());
    tft.drawString(str, 20, 20);  // prints string at (70,80)
  }

  lcd_backlight_update();
  delay(200);
}

bool connect_wifi(const char* ssid, const char* password) {
  Serial.print("Attempting to connect to SSID: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);

  int retry_cnt = 0;
  while (retry_cnt < RETRY_MAX && WiFi.status() != WL_CONNECTED) {
    retry_cnt++;
    Serial.print(".");
    delay(1000);
  }

  return retry_cnt < RETRY_MAX;
}

void lcd_backlight_on() {
  turn_on_count = 0;
  digitalWrite(LCD_BACKLIGHT, HIGH);
}

void lcd_backlight_update() {
  if (turn_on_count >= TURN_ON_MAX) {
    digitalWrite(LCD_BACKLIGHT, LOW);
  } else {
    turn_on_count++;
  }
}

bool post_light_request(bool turn_on) {
  Serial.println("\nStarting connection to server...");
  if (!client.connect(SWITCH_BOT_SERVER, 443)) {
    Serial.println("Connection failed!");
    return false;
  } else {
    Serial.println("Connected to server!");
    String data = turn_on ? "{\r\n\"command\": \"turnOn\",\r\n\"parameter\": "
                            "\"default\",\r\n\"commandType\": \"command\"\r\n}"
                          : "{\r\n\"command\": \"turnOff\",\r\n\"parameter\": "
                            "\"default\",\r\n\"commandType\": \"command\"\r\n}";
    char s[128];
    sprintf(s, "Content-Length: %d\r\n", data.length());
    // Make a HTTP request:
    client.print("POST /v1.0/devices/" LIGHT_DEVICE_ID
                 "/commands/ HTTP/1.1\r\n");
    client.print("Host: " SWITCH_BOT_SERVER "\r\n");
    client.print("Authorization: " AUTHORIZATION_KEY "\r\n");
    client.print("Content-Type: application/json\r\n");
    client.print(s);
    client.print("\r\n");
    client.print(data);
    client.print("\r\n");
    client.print("\r\n");

    while (client.connected()) {
      String line = client.readStringUntil('\n');
      if (line == "\r") {
        Serial.println("headers received");
        break;
      }
    }
    // if there are incoming bytes available
    // from the server, read them and print them:
    while (client.available()) {
      char c = client.read();
      if (c == '\n') {
        Serial.write('\r');
      }
      Serial.write(c);
    }
    client.stop();
    return true;
  }
}