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The connection strength sensor listens for changes in the cellular network signal strength.
This sensor requires permissions to read the phone's state. The JSON format for a sample from this sensor is:
{
"userid":"test-user-id",
"deviceid":"test-device-id",
"senseStartTime":"16:15:07:545 30 06 2015 +0100 GMT+01:00",
"senseStartTimeMillis":1435677307545,
"dataType":"ConnectionStrength",
"strength":0
}