Iphone App to send a text string via SMS from a drop down list

Hello I have some security systems that can be set and unset by sending a text message. If the user wanted to se the alarm system they would send a text to the sim card in the alarm system like this; command, then system number, then code; which would look like this; SET,000001,1234. The system will then reply, 000001, The Red Lion, SET To unset the user sends a text like this; UNSET,000001,1234 The system will then reply 000001, The Red Lion, UNSET In alarm the system will send a text like; 000001, The Red Lion, Intrusion, zone 1 I would like the app to make it easier for the user to send the text commands without having to remember them. Ideally the app will be able to store all the text commands and be able to update from a server or a file on my website so that i can add new ones as needed. I have three differnent alarm systems like this and the text commands are differnent for each system so i would like the first drop down field to select system type. drop down field 1 - system type; system type1, system type2, system type3. The user will select one of these which will then only allow the text commands relavent to that system in the command drop down filed. drop down field 2 - system number (this is manually entered by the user and should be automaticaly stored) drop down field 3 - code (this is manually entered by the user and should be storedif a check box is ticked) drop down field 4 - text command Some commands, like program a new user number or change zone type may require an additional drop down. The total of the above fields will make up the text string to send to the alarm panel when the user presses "send" The app should be able to store several systems details and be able to slide to delete a system The app should be able to store logs on the commands sent and replies received The important thing is that there is a way of checking for updates for new text commands and me being able to update a text file on a server with new commands as needed. Looking forward to your replies. Thanks Chris