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Activate the device's vibrator in a pattern.
Enter a comma-separated list of numbers. The 1st one is how long to be silent for, the 2nd one is how long to vibrate for and then alternating.
Times are in milliseconds i.e. to vibrate for one second enter 1000, to vibrate for half a second enter 500.
0 values are disallowed, excepting for the first value.