Arduino firmware for SMS OTP.

Author: nthnn

sms-otp-firmware/.gitignore

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+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

sms-otp-firmware/.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ],
+    "unwantedRecommendations": [
+        "ms-vscode.cpptools-extension-pack"
+    ]
+}

sms-otp-firmware/include/firmware.h

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+#ifndef FIRMWARE_H
+#define FIRMWARE_H
+
+#include <SoftwareSerial.h>
+#include <SIM900.h>
+
+static SoftwareSerial shieldSerial(7, 8);
+static SIM900 sim900(&shieldSerial);
+
+void sendOTP(String number, String email, String otp);
+
+#endif

sms-otp-firmware/platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:uno]
+platform = atmelavr
+board = uno
+framework = arduino
+lib_deps = nthnn/SIM900@^1.0.0

sms-otp-firmware/src/firmware.cpp

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+#include <firmware.h>
+
+void sendOTP(String number, String email, String otp) {
+    Serial.println(sim900.sendSMS(number, "Your one-time password (OTP) is " + otp +
+        ". Do not share your OTP to anyone. If you did not request for your OTP, report at " +
+        email + ".\n\n(Sent via QLBase)") ? F("SENT") : F("ERR")
+    );
+}

sms-otp-firmware/src/main.cpp

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+#include <Arduino.h>
+#include <firmware.h>
+
+void setup() {
+    Serial.begin(9600);
+}
+
+void loop() {
+    if(Serial.available() > 0) {
+        String serialString = Serial.readString();
+        serialString.trim();
+
+        int delim1 = serialString.indexOf(F(",")),
+            delim2 = serialString.lastIndexOf(F(","));
+
+        sendOTP(
+            serialString.substring(0, delim1),
+            serialString.substring(delim1 + 1, delim2),
+            serialString.substring(delim2 + 1)
+        );
+    }
+}