M5Stack Core2: HTTP クライアント (Post)

http_post/http_post.ino

// ---------------------------------------------------------------
/*
	http_post.ino

						Jul/08/2023
*/
// ---------------------------------------------------------------
#include <M5Core2.h>
#include <Arduino.h>

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

WiFiMulti wifiMulti;
HTTPClient http;

const char *ssid = "some-ssid";
const char *password = "some-password";

int count = 0;

// ---------------------------------------------------------------
void setup()
{
	M5.begin();
	M5.Lcd.setBrightness(32);

	wifiMulti.addAP(ssid, password);
	M5.Lcd.print("\nConnecting Wifi...\n");

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

	String url_target = "https://httpbin.org/post";

	http_post_proc(url_target);
	delay(5000);

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

// ---------------------------------------------------------------
void loop()
{
	Serial.println("*** loop *** " + String(count));
	M5.Lcd.setTextSize(3);
	M5.Lcd.setCursor(5,30);
	M5.Lcd.println("*** loop *** " + String(count));
  String url_target = "https://httpbin.org/post";

	http_post_proc(url_target);

	delay(3000);
	M5.Lcd.clear();
	delay(1000);
	M5.Lcd.fillScreen(WHITE);
	delay(1000);
	count++;
}

// ---------------------------------------------------------------
void http_post_proc(String url_target)
{
  	M5.Lcd.setTextSize(1);
	DynamicJsonDocument doc(128);
	char data_json[128];

	doc["user"] = "jiro";
	doc["password"] = "123456";
	serializeJson(doc, data_json);

	if((wifiMulti.run() == WL_CONNECTED)) {
		M5.Lcd.print("[HTTP] begin...\n");
		http.begin(url_target);
		M5.Lcd.print("[HTTP] POST...\n");
		int httpCode = http.POST((uint8_t*)data_json, strlen(data_json));
		if(httpCode > 0) {
			M5.Lcd.printf("[HTTP] POST... 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] POST... failed, error: %s\n", http.errorToString(httpCode).c_str());
			}
		http.end();
	}
	else
		{
		M5.Lcd.print("connect failed");
		}

    doc.clear();
}

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

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 2.1.1 で表示した様子