This repo contains code to support the logging of data acquisition packets and their analysis.
The major subprojects (subdirectories are):
- pi3-buildroot - Buildroot configuration for Raspberry Pi 3, which serves as the host data logger running "tcpdump". The "tcpdump" utility may be replaced later by a real-time logger which is tailored to specific needs of the overall project.
- capextract - Extraction of data from captured packets and conversion to CSV. This is dependent on the packet definitions for each of the reporting controls or sensors. The CSV conversion may be done on the RaspPi3, or the data may be downloaded after flight to a laptop or desktop and converted there.
- daqparse - Interpretation of CSV data, possibly in Python and Bokeh. This is expected to run on laptop or desktop.
A logger other than "tcpdump" may eventually be created. In that case, there may be another project:
- logger - listens for specific network traffic, and stores it into log files, for later processing. Alternatively, selected packets may be forwarded to a capextract thread/process for immediate consumption.
The current architecture assumes real-time capture and logging of data packets by "tcpdump"; subsequent extraction of data and conversion to CSV depend on the logging media (microSD card) being removed from the pod in non-real-time.
There are possible variations to this. All start with:
- Real-time capture and logging of packets in a 'capture thread'.
The capture thread may filter certain data channels for:
- immediate conversion to CSV.
- collection of channel min/max values for periodic transmission to a ground station.