override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        requestSmsPermission()
    }

    private fun requestSmsPermission() {
        val permission = Manifest.permission.RECEIVE_SMS
        val grant = ContextCompat.checkSelfPermission(this, permission)
        if (grant != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this, arrayOf(permission), REQUEST_CODE_SMS_PERMISSION)
        }
    }

class SMSReceiver : BroadcastReceiver() {
    companion object {
        private val TAG by lazy { SMSReceiver::class.java.simpleName }
    }

    override fun onReceive(context: Context?, intent: Intent?) {
        if (!intent?.action.equals(Telephony.Sms.Intents.SMS_RECEIVED_ACTION)) return
        val extractMessages = Telephony.Sms.Intents.getMessagesFromIntent(intent)
        extractMessages.forEach { smsMessage -> Log.v(TAG, smsMessage.displayMessageBody) }
        //TODO
    }
}