Timestamp reference ?

tazilios · May 2016

Hi,

We are using the CPro's as a datasource for our prototype. Our developers are working on the node-metawear github.

Since the timestamp recorded is critical for our data analysis and business interpretation, I've browsed the documentation to better understand how it is calculated and logged but I miss information.

To give you a bit of context, multiple CPro's will be streaming data into 1 single data repository so it is crucial for us to be sure the timestamps are synchronized and accurate.

So far, our assumption is that the Data Processor is managing the time information. Is that correct?
Could you provide me more information on how the time it is initiated/maintained?
Are we able to force/reset the time?

Thank you for your support!

Eric · May 2016

There is no time management on the MetaWear, not in the sense that it knows what the current time is. Stream data is simply sent as is however logged data is tagged with a reference value that the API uses to determine what the actual timestamp is. You can refer to the C++ API if want the low level details of how to map reference values to timestamps.

https://github.com/mbientlab/Metawear-CppAPI/blob/0.4.15/src/metawear/core/cpp/logging.cpp#L93

https://github.com/mbientlab/Metawear-CppAPI/blob/0.4.15/src/metawear/core/cpp/logging.cpp#L209

Timestamp reference ?

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