CAN-TcpCanStream

PeCAN service to receive TCP request from router and execute associated action.

Set-up the service

Once the repository has been cloned on the home dorectory /home/YOURUSERNAME/, do:

• Copy bash script in ~ directory sudo cp TcpCanStrean.sh ~
• Modify YOURUSERNAME by your actual username in the file with sudo nano TcpCanStream.sh
• Change access rights with sudo chmod +x TcpCanStream.sh
• Copy service file from repository to system directory sudo cp TcpCanStrean.service /etc/systemd/system/
• Modify YOURUSERNAME by your actual username in the file with sudo nano TcpCanStream.service
• Reload daemon with sudo systemctl daemon-reload
• Enable service with sudo systemctl enable TcpCanStream.service
• Start service with sudo systemctl start TcpCanStream.service
• Check status with systemctl status TcpCanStream.service

From now on, the service TcpCanStream will start running at the device boot.

Handled requests:

The TcpCanStream service is listening on port tcp 5558 to receive requests and reply back on tcp port 5559:

• identify: to send back its hostname to the router.
• start: to start recording CAN messages from the CAN-HAT and send them back to the router in a data stream.
• stop: to stop recording and create log files.
• clean: to clean all the log files (used after the router copied those files with a sftp get request).

Functionment:

To perform this service, the zmq package is used, with a SUB socket to receice the requests (send from the router with a PUB socket) and a DEALER socker to send response back (to ROUTER socket from the router). A while loop is running to listen permanently and if a reauest is received and recognized in the list previously mentionned, the action triggered will be performed in parallel in a thread until the action is over or it gets interrupted but another order.