Devstate

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[Synopsis]
Generate a device state change event given the input parameters

[Description]
 Devstate(device|state):  Generate a device state change event given the input parameters. Returns 0. State values match the asterisk device states. They are 0 = unknown, 1 = not inuse, 2 = inuse, 3 = busy, 4 = invalid, 5 = unavailable, 6 = ringing