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The accelerometer is a motion sensor that measures the acceleration of the device.
This sensor does not currently require any specific permission. The JSON format for a sample from this sensor is:
{
"userid":"user-id",
"deviceid":"device-id",
"senseStartTime":"12:42:39:031 30 06 2015 +0100 GMT+01:00",
"senseStartTimeMillis":1435664559031,
"dataType":"Accelerometer",
"xAxis":[0.20949265360832214,0.20949265360832214,...],
"yAxis":[-0.05626374110579491,-0.05626374110579491,...],
"zAxis":[9.548674583435059,9.548674583435059,...],
"sensorTimeStamps":[1435664559191,1435664559191,...],
"sampleLengthMillis":8000
}