I remember device name was either Proximity or Hello Sensor but I am not sure. Now it is clear that the default application is Hello Sensor.
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Yes, I remember seeing Hello_Sensor on a new chip. I think if you have Light Blue installed on a phone, you can see details about who is advertising and what services and characteristics there are.
It is not exactly hello_sensor but similar. It is a ble loopback application that is used for RF testing. However no assumptions should be made on this application other than to test that the module you got has working hardware. It is expected that this application would be reprogrammed on your unit. Plus this application can change at any time in the factory as necessary for RF testing.