- Host Configuration
- Runtime Node Configuration
- SDF Configuration
- Ecosystem Tools
- Application Development
- Dynamic Driver Development
Access Logfile Data
PolySync Core provides tools to access logfile data stored in
plog files from outside and inside the PolySync Core time domain.
These tools can be used to convert abstracted high level data to other formats, extract the raw
plog data, or abstract the raw data into custom message types.
plog file format to store binary sensor data.
plog files contain raw sensor data as it was provided to the dynamic driver nodes across the native bus─CAN, Ethernet, Serial.
- Accessing raw sensor data occurs outside the PolySync Core time domain, and the data is not synchronized with other data sources
- Accessing sensor data through high level, abstracted messages occurs within the PolySync Core time domain, and the publishing of high level messages is synchronized with other dynamic driver nodes in the runtime
Extracting abstracted sensor data
Core nodes subscribe to high level message types containing the abstracted sensor data. Nodes access the data buffer within the nodes callback function at runtime.
Extracting raw sensor data
Raw sensor data is stored within a
plog file, which can be iterated and decoded by the transcoder tool, and logfile iterator C example.
The transcoder is a tool designed to decode the
plog file format, and reencode the data to any other file format. This application does not connect to the PolySync Core bus.
The transcoder is an open source tool that is accessed through PolySync’s GitHub repo.
The logfile iterator is an application node that operates outside of the Core time domain. It’s written using the Core C APIs, and is designed to:
- Roll over the contents of a
plogfile, outside the time-domain
- Provide the records (sensor data) in an in-memory representation, suitable for publish/subscribe/copy routines
- Re-map message types, if the data model has changed or differs from what was originally used to create the
- Modify records, and create a new plog file
The C API Examples repository has two logfile iteration examples.