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The screen sensor captures on/off screen events.
This sensor does not require any permissions. The JSON format for a sample from this sensor is:
{
"userid":"test-user-id",
"deviceid":"test-device-id",
"senseStartTime":"16:26:22:174 30 06 2015 +0100 GMT+01:00",
"senseStartTimeMillis":1435677982174,
"dataType":"Screen",
"status":"SCREEN_OFF"
}