SEND_CAN_MESSAGE

Send a message to a CAN system. Send a message to a CAN device. This block should be compatible with all devices that support the CAN interface. A connection to the device is required. Use a CAN_CONNECT block to connect to a CAN device. Params: CAN_address : str The CAN device address to connect to. message : Stateful A list of messages to send to the CAN device. Returns: out : DataContainer Optional: None

Python Code

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


@flojoy(deps={"python-can": "4.3.1"})
def SEND_CAN_MESSAGE(
    CAN_address: str, message: Stateful, default: Optional[DataContainer] = None
) -> Optional[DataContainer]:
    """Send a message to a CAN system.

    Send a message to a CAN device. This block should be compatible with all devices that support the CAN interface.
    A connection to the device is required. Use a CAN_CONNECT block to connect to a CAN device.

    Parameters
    ----------
    CAN_address : str
        The CAN device address to connect to.
    message : Stateful
        A list of messages to send to the CAN device.

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

    for msg in message.obj:
        connection.send(msg)

    return None

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Example

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This example shows how to send a frame to a CAN bus using the CANable USB-to-CAN adapter. The application sends a first frame intended to indicate the start of a test on a system. Subsequently, the application sends a burst of messages and then sends a frame to indicate the end of the test.

This application uses an CANABLE_CONNECT block to establish a connection to the CAN bus, but this connection could be replaced by any other connection. For example, the PEAK_CONNECT block could be used instead.