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An old android phone can make the job. If the alarm has an Open Close output, it can be plugged to the jack audio of the smartphone and make an automatic SMS or CALL. You car search for “Wired headphone Dialing Alarm” or look at alarmD

Basically a wired alarm is just a Normally Closed/Open circuit. A “do it yourself” system can be easily achieved with a modern Ethernet IO board. It’s trivial to control these boards with a mobile phone. A simple stand alone alarm can ever be achieved with a single smartphone for example you can...