Arduino example

#include <Arduino.h>
#include <SoftwareSerial.h>
#include <Wire.h>
#include <Adafruit_LIS3DH.h>
#include <U8glib.h>

#define SIM800_TX_PIN 8
#define SIM800_RX_PIN 7
#define TOUCH_PIN 6
#define VIBRATION_PIN 5

SoftwareSerial serialSIM800(SIM800_TX_PIN, SIM800_RX_PIN);
Adafruit_LIS3DH accelerometer = Adafruit_LIS3DH();
U8GLIB_SH1106_128X64 display(U8G_I2C_OPT_DEV_0 | U8G_I2C_OPT_FAST);
int displayTextValue = -128;

void readSIM800Serial() {
    while (serialSIM800.available()) {
        Serial.write(serialSIM800.read());
    }
    Serial.println();
}

String executeCommand(String command, unsigned long delayMs) {
    while (serialSIM800.available()) {
        serialSIM800.flush();
    }

    serialSIM800.println(command.c_str());

    delay(delayMs);

    String response = "";
    while (serialSIM800.available()) {
        response.concat(serialSIM800.readString());
        delay(10);
    }

    response.remove(0, command.length());
    response.trim();

    return response;
}

void sendMessage() {
    serialSIM800.flush();

    serialSIM800.println("AT+CSQ");
    readSIM800Serial();

    serialSIM800.println("AT+CMGF=1");
    delay(1000);
    Serial.print("\t [*] AT+CMGF=1 --> ");
    readSIM800Serial();

    String number = "509161630";
    serialSIM800.println("AT+CMGS=\"" + number + "\"\r");
    Serial.print("[*] AT+CMGS=1 --> ");
    readSIM800Serial();
    delay(1000);

    String SMS = String("Test arduino");
    serialSIM800.println(SMS);

    delay(100);
    serialSIM800.println((char) 26);

    Serial.print("[*] Send message --> ");
    readSIM800Serial();

    Serial.println("[*] After message");
}

boolean communicationInitialized = false;

void initInternetCommunication() {
    serialSIM800.flush();

    Serial.print("Initializing network connection... ");
    Serial.println(executeCommand("AT", 300));
    Serial.println(executeCommand("AT+SAPBR=3, 1, \"APN\", \"internet\"", 1000));
    Serial.println(executeCommand("AT+SAPBR=1, 1", 1000));

    Serial.println(executeCommand("AT+HTTPINIT", 1000));

    communicationInitialized = true;
    Serial.println("SUCCESS");
}

String getDataFromServer() {
    serialSIM800.flush();

    if (!communicationInitialized) {
        Serial.println("Error, sim800l not initialized!");
        return "";
    }

    Serial.println(executeCommand("AT+HTTPPARA=\"CID\", 1", 300));
    Serial.println(executeCommand("AT+HTTPPARA=\"URL\", \"http://httpbin.org/get\"", 300));
    Serial.println(executeCommand("AT+HTTPACTION=0", 2000));

    String result = executeCommand("AT+HTTPREAD", 2000);
    Serial.println(result);

    return result;
}

void sendDataToServer() {
    serialSIM800.flush();

    if (!communicationInitialized) {
        Serial.println("Error, sim800l not initialized!");
        return;
    }

    Serial.println(executeCommand("AT+HTTPPARA=\"URL\", \"http://httpbin.org/post\"", 300));
    Serial.println(executeCommand("AT+HTTPPARA=\"CONTENT\", \"application/x-www-form-urlencoded\"", 300));
    Serial.println(executeCommand("AT+HTTPDATA=8, 2000", 300));
    Serial.println(executeCommand(String(millis()), 1000));

    Serial.println(executeCommand("AT+HTTPACTION=1", 500));
}

void setup() {
    pinMode(2, OUTPUT);
    digitalWrite(2, HIGH);

    pinMode(3, OUTPUT);
    digitalWrite(3, HIGH);
    delay(2000);
    digitalWrite(3, LOW);

    pinMode(4, OUTPUT);
    digitalWrite(4, HIGH);

    Serial.begin(9600);
    pinMode(TOUCH_PIN, INPUT);
    pinMode(VIBRATION_PIN, OUTPUT);

    pinMode(13, OUTPUT);
    digitalWrite(13, LOW);

    serialSIM800.begin(9600);
    delay(1000);

    if (!accelerometer.begin()) {
        Serial.println("Couldn't find LIS3DH!");
    }
    accelerometer.setRange(LIS3DH_RANGE_4_G);

    display.setColorIndex(1);
    display.setFont(u8g_font_unifont);
    display.begin();

    Serial.print("Initializing...");
    String result = "";
    while (result[9] != '1') {
        result = executeCommand("AT+CREG?", 100);
        delay(200);
    }

    Serial.println(" SUCCESS!");
    initInternetCommunication();
    digitalWrite(13, HIGH);
}

int counter = 0;
void loop() {
    display.firstPage();

    accelerometer.read();
    // Serial.print("X:  "); Serial.print(accelerometer.x);
    // Serial.print("  \tY:  "); Serial.print(accelerometer.y);
    // Serial.print("  \tZ:  "); Serial.println(accelerometer.z);
    // Serial.print("HeartBeat: ");
    // Serial.println(analogRead(A0));
    String dataValue = "";

    if (digitalRead(TOUCH_PIN) == HIGH) {
        analogWrite(VIBRATION_PIN, 255);
        delay(300);
        analogWrite(VIBRATION_PIN, 0);

        dataValue = getDataFromServer();
        // sendDataToServer();

        // Serial.println("======= Returned value: ");
        // dataValue.trim();
        // Serial.println(dataValue);
        // Serial.println("======= End");
    }

    displayTextValue++;
    if (displayTextValue > 130) {
        displayTextValue = -128;
    }

    do {
        display.drawStr(24, 24, "Limfy v0.1");
        if (dataValue == "") {
            display.drawStr(displayTextValue, 48, "In development");
        } else {
            display.drawStr(displayTextValue, 48, dataValue.c_str());
        }
    } while (display.nextPage());

    if (dataValue != "") {
        delay(3000);
    }
    delay(70);

    // delay(2000);

    // analogWrite(VIBRATION_PIN, 30);
    // delay(300);
    // analogWrite(VIBRATION_PIN, 0);

    // sendDataToServer();
    // counter++;
    // Serial.print("COUNTER ==> ");
    // Serial.println(counter);

    // analogWrite(VIBRATION_PIN, 30);
    // delay(300);
    // analogWrite(VIBRATION_PIN, 0);
}