Create an application to accomplish the task below -- 2

I have a KMY SMS printer and the SDK for programming it. It uses the "c" language. What I would like the printer to do is: Store an ID string, a username and password and two phone numbers in the printer. Usage: User selects an item from a menu of 3 or 4 items and enters 3 pieces of information then hit the send button. The static stored text, an auto incremented transaction number and the 3 pieces of data are encrypted and sent to the first number stored. The printer should attempt to dial the first number. If the first attempt fails, dial the second number. The printer should wait for a response. The user should have the option to print a receipt if the transaction upon an OK response.. That's it.