M5Stack Core2: HTTP クライアント (Get)

http_get/http_get.ino

// ---------------------------------------------------------------
/*
	http_get.ino

						Jul/07/2023
*/
// ---------------------------------------------------------------
#include <M5Core2.h>
#include <Arduino.h>

#include <WiFiMulti.h>
#include <HTTPClient.h>

#define SSID "some-ssid"
#define PASSWORD "some-password"

WiFiMulti wifiMulti;
HTTPClient http;

int count = 0;

// ---------------------------------------------------------------
void setup()
{
	M5.begin();
	wifiMulti.addAP(SSID, PASSWORD);
	M5.Lcd.print("\nConnecting Wifi...\n");

	delay(3000);
	Serial.println("*** setup *** aaa ***");
	delay(1000);

	Serial.println("*** setup ***");
}

// ---------------------------------------------------------------
void loop()
{
	Serial.println("*** loop *** " + String(count));
  M5.Lcd.setCursor(0, 0);  
	M5.Lcd.setTextSize(2);

	String url_target = "https://httpbin.org/get";
	http_get_proc(url_target);

	M5.Lcd.setTextSize(3);
	M5.Lcd.println("*** loop *** " + String(count));
	delay(5000);
	M5.Lcd.clear();
	delay(2000);
	count++;
}

// ---------------------------------------------------------------
void http_get_proc(String url_target)
{
	if((wifiMulti.run() == WL_CONNECTED)) {
		M5.Lcd.print("[HTTP] begin...\n");
		http.begin(url_target);
		M5.Lcd.print("[HTTP] GET...\n");
		int httpCode = http.GET();
		if(httpCode > 0) {
			M5.Lcd.printf("[HTTP] GET... code: %d\n", httpCode);

			if(httpCode == HTTP_CODE_OK) {
				String payload = http.getString();
				M5.Lcd.println(payload);
				Serial.println(payload);
				}
			}else {
			M5.Lcd.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());
			}
		http.end();
	}
	else
		{
		M5.Lcd.print("connect failed");
		}
}

// ---------------------------------------------------------------

シリアルポートの受信は次のコマンドで行います。

cu -s 115200 -l /dev/ttyUSB0

Arduino IDE 2.3.4 で確認しました。