- Host Configuration
- Runtime Node Configuration
- SDF Configuration
- Ecosystem Tools
- Application Development
- Dynamic Driver Development
PolySync Core is able to record incoming sensor data, and allows you to replay the data on any other system. Using Studio or command line tools, you can command nodes to start and stop the recording of incoming data.
Both methods use the same underlying logic to record data: the application populates a
ps_rnr_msg with the desired state and publishes the message to the bus, which active nodes receive and respond to.
1. Recording data with Studio
1.1 Starting the runtime
Before sensor data can be recorded, runtime nodes must be running in the hardware state.
To command nodes into the hardware state, press Studio’s button.
For more detailed instructions, see the Runtime section for an article detailing how to start sensor and hardware nodes in hardware mode.
1.2 Start recording data
To begin recording data, press the button.
The record module will name the logfile session based on the UTC timestamp of the moment the record button is pressed.
If you cannot see the button, then the runtime nodes are note operating in hardware state, and you should check Studio’s system state which is launched from the icon.
1.3 Command active nodes to stop recording data
When you’ve finished recording your data or scenario, press the button.
2. Change the Record and Replay Directory
Each host ECU in a PolySync Core runtime has a unified directory where sensor data is written to.
This is defined in theusing the SDF Configurator.
Update the Record and Replay Directory on each host to change the location where logfiles are written to. By default logfiles are located in
Each node in the runtime records data asychronously to a PolySync Core
plog logfile. A collection of
plog’s is a logfile session.
3. Nodes that support record and replay
Custom nodes don’t natively record and replay data. They must use PolySync Core APIs to manage logfile data, for example the PolySync-provided nodes, or the
rnr_node C example application.
PolySync-provided nodes implement file reading and writing routines using the PolySync Core Logfile API. The nodes also need to listen for the
ps_rnr_msg, which uses the Record & Replay API to instruct nodes regarding what files they should open, and when to start/stop recording and replaying data.
Applications like Studio’s replay module implement the Record & Replay API to instruct nodes which directory to record data to, and at what time to start writing data to the disk (now, or in the near future).
4. Next steps
The logfile session is now available in Studio’s logfile management area which is opened with the icon.