REMOVE_CAN_BUS_FILTER

Remove all filters attached to a CAN bus connection. A connection to the device is required. Use a CAN_CONNECT block to connect to a CAN device. Params: CAN_address : str The CAN bus address to remove all filters from. Returns: out : DataContainer Optional: None

Python Code

from flojoy import flojoy, DeviceConnectionManager, DataContainer
from typing import Optional
import can


@flojoy(deps={"python-can": "4.3.1"})
def REMOVE_CAN_BUS_FILTER(
    CAN_address: str, default: Optional[DataContainer] = None
) -> Optional[DataContainer]:
    """Remove all filters attached to a CAN bus connection.

    A connection to the device is required. Use a CAN_CONNECT block to connect to a CAN device.

    Parameters
    ----------
    CAN_address : str
        The CAN bus address to remove all filters from.

    Returns
    -------
    DataContainer
        Optional: None
    """
    connection: can.interface.Bus = DeviceConnectionManager.get_connection(
        CAN_address
    ).get_handle()

    connection.set_filters(None)

    return None

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Example

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Download this Flojoy App

This application demonstrates how to use multiple CAN blocks to connect to a PEAK-USB device and read messages from it. The PEAK-USB device is a USB-to-CAN interface that enables you to connect a computer to a CAN network. This device is used in this case to capture the messages of a particular sensor by filtering them directly at the kernel level, thus reducing the load on the CPU, and save those messages to a log file locally.

Once the app is done, the generated logs are exported to an S3 bucket to keep a record of the sensor’s data for further analysis.

To replicate this application, you must connect the PEAK-USB to your computer and install the required driver (refer to the PEAK_CONNECT blocks for more information on the necessary driver for your platform). Then, simply specify the PEAK-USB channel in the required blocks, and this Flojoy application will log the messages received by the device!

Detecting channels A valuable block is the PEAK_DETECT_AVAILABLE_DEVICE. This block allows you to display the devices using the PCAN interface that are connected to your computer.