This is a simple android app to decode "encoded" SMSs sent by alarm systems that use the "ContactID" syntax (for example Abus). It displays SMS sent from a specific number, and decodes the ContactID according to predefined settings for:

• ContactID event codes
• Event kinds

It uses user settings to decode:

• user codes
• sensor codes

The ContactID syntax recognized is based on 15 numbers followed by one letter, which are:

• _ _ _ _: owner of alarm
• 18: syntax (should always be 18 for ContactID)
• _ : event kind
• _ _ _: ContactID event code
• _ _: user
• _ _ _: zone (sensor)
• _: checksum (hexa)

Warning: I only tested this app with one alarm system (Abus)...I hope it should work on other alarm systems using the same syntax, though.