M5Stack/examples/Modules/SIM800L/HTTP/HTTP.ino

/*
 * SPDX-FileCopyrightText: 2025 M5Stack Technology CO LTD
 *
 * SPDX-License-Identifier: MIT
 */
/*
 * @Hardwares: M5Core + Module SIM800L
 * @Platform Version: Arduino M5Stack Board Manager v2.1.3
 * @Dependent Library:
 * M5Stack@^0.4.6: https://github.com/m5stack/M5Stack
 */

#include "M5Stack.h"
#include "TFTTerminal.h"

TFT_eSprite TerminalBuff = TFT_eSprite(&M5.Lcd);
TFTTerminal terminal(&TerminalBuff);

String waitRevice()
{
    String recvStr;
    do {
        recvStr = Serial2.readStringUntil('\n');
    } while (recvStr.length() == 0);
    Serial.println(recvStr);
    terminal.println(recvStr);
    return recvStr;
}

void sendATCMD(String cmdStr)
{
    Serial2.print(cmdStr);
    delay(100);
}

int sendATCMDAndRevice(String cmdStr)
{
    delay(1000);
    Serial2.print(cmdStr);
    delay(100);
    waitRevice();
    String recvStr = waitRevice();
    delay(100);
    if (recvStr.indexOf("OK") != -1) {
        return 0;
    } else {
        return -1;
    }
}

void GET()
{
    terminal.println("GET Request");
    sendATCMD("AT?\r\n");
    delay(100);
    Serial2.flush();
    sendATCMDAndRevice("AT+CGATT?\r\n");
    sendATCMDAndRevice("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"\r\n");
    sendATCMDAndRevice("AT+SAPBR=3,1,\"APN\",\"CMNET\"\r\n");
    sendATCMDAndRevice("AT+SAPBR=0,1\r\n");
    sendATCMDAndRevice("AT+SAPBR=1,1\r\n");
    sendATCMDAndRevice("AT+HTTPINIT\r\n");
    sendATCMDAndRevice("AT+HTTPPARA=\"URL\",\"http://api.m5stack.com/v1\"\r\n");
    sendATCMDAndRevice("AT+HTTPACTION=0\r\n");
    // while(!Serial2.available());
    delay(5000);
    sendATCMDAndRevice("AT+HTTPREAD\r\n");
    delay(1000);
    String recvStr;
    while (Serial2.available()) {
        recvStr += Serial2.readString();
    }
    Serial.println(recvStr);
    terminal.println(recvStr);
    sendATCMDAndRevice("AT+HTTPTERM\r\n");
}

void POST()
{
    terminal.println("POST Request");
    sendATCMD("AT?\r\n");
    delay(100);
    Serial2.flush();
    sendATCMDAndRevice("AT+CGATT?\r\n");
    sendATCMDAndRevice("AT+SAPBR=3,1,\"CONTYPE\",\"GPRS\"\r\n");
    sendATCMDAndRevice("AT+SAPBR=3,1,\"APN\",\"CMNET\"\r\n");
    sendATCMDAndRevice("AT+SAPBR=0,1\r\n");
    sendATCMDAndRevice("AT+SAPBR=1,1\r\n");
    sendATCMDAndRevice("AT+HTTPINIT\r\n");
    sendATCMDAndRevice("AT+HTTPPARA=\"CID\",1\r\n");
    sendATCMDAndRevice("AT+HTTPPARA=\"CONTENT\",\"application/x-www-form-urlencoded\"\r\n");
    sendATCMDAndRevice("AT+HTTPPARA=\"URL\",\"http://header.json-json.com/\"\r\n");
    sendATCMD("AT+HTTPDATA=10,3000\r\n");
    sendATCMD("M5STACK,GO\r\n");
    sendATCMDAndRevice("AT+HTTPACTION=1\r\n");
    delay(5000);
    sendATCMDAndRevice("AT+HTTPREAD\r\n");
    delay(1000);
    String recvStr;
    while (Serial2.available()) {
        recvStr += Serial2.readString();
    }
    Serial.println(recvStr);
    terminal.println(recvStr);
    sendATCMDAndRevice("AT+HTTPTERM\r\n");
}

void setup()
{
    M5.begin();
    Serial2.begin(115200, SERIAL_8N1, 16, 17);
    Serial2.flush();
    delay(1000);
    M5.Lcd.fillRect(0, 0, 320, 240, TFT_BLACK);
    M5.Lcd.fillRect(0, 0, 320, 40, TFT_WHITE);
    M5.Lcd.setTextColor(TFT_BLACK);
    M5.Lcd.setTextDatum(TC_DATUM);
    M5.Lcd.drawString("SIM800L HTTP GET/POST", 160, 10, 4);
    M5.Lcd.setTextDatum(TL_DATUM);
    M5.Lcd.setTextColor(TFT_WHITE);
    TerminalBuff.createSprite(240, 200);
    terminal.setGeometry(20, 55, 300, 200);
    terminal.setFontsize(1);
    terminal.println("Press Btn A GET Request");
    terminal.println("Press Btn B POST Request");
};

void loop()
{
    M5.update();
    if (M5.BtnA.wasPressed()) GET();
    if (M5.BtnB.wasPressed()) POST();
    if (M5.BtnC.wasPressed()) {
        String recvStr;
        recvStr = Serial2.readStringUntil('\n');
        Serial.println(recvStr);
        terminal.println(recvStr);
    };
    delay(10);
}