Use SMSCMD to send SMS messages to your app/device
Step 1: Go to http://www.smscmd.net/ and sign up.
Step 2: Create a SMS application on SMSCMD and choose MQTT type.
Step 3: Create your client (see Sms2Mqtt demo as example).
Step 4: Put in your app name and credentials.
Step 5: Run the app.
Step 6: Send SMS and watch your app receive it.