raspberry pi4 - how to send a can bus message with 2 seconds between spaces in python-can - Stack Overflow

I want to be able to send a message on canbus one with 2 seconds between themhave tried some python ca

I want to be able to send a message on canbus one with 2 seconds between them

have tried some python can examples with the same result can send and receive with python-can code

now I don't know if I'm doing something wrong or the code

run with a raspberry pi 4b with a can bus module mcp2515 os bookworm 64bit have installed python-can 4.5

import can

with can.interface.Bus(interface="socketcan", channel="can0") as bus:
    msg = can.Message(
        arbitration_id=0x020,
        data=[0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07],
        is_extended_id=False
    )

    task = bus.send_periodic(msgs=msg, period=1)
Exception has occurred: CanOperationError
Couldn't send CAN BCM frame due to OS Error: Invalid argument You are probably referring to a non-existing frame. [Error Code 22]
OSError: [Errno 22] Invalid argument

The above exception was the direct cause of the following exception:

  File "/home/pican/foobar/project/test_5.py", line 7, in <module>
    task = bus.send_periodic(msgs=msg,period=1,store_task=True)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
can.exceptions.CanOperationError: Couldn't send CAN BCM frame due to OS Error: Invalid argument You are probably referring to a non-existing frame. [Error Code 22]
#!/usr/bin/env python

"""
This example exercises the periodic task's multiple message sending capabilities
to send a message containing a counter and a checksum.

Expects a vcan0 interface:

    python3 -m examples.crc

"""

import logging
import time

import can

logging.basicConfig(level=logging.INFO)


def crc_send(bus):
    """
    Sends periodic messages every 1 s with no explicit timeout. Modifies messages
    after 8 seconds, sends for 10 more seconds, then stops.
    """
    msg = can.Message(arbitration_id=0x12345678, data=[0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07],is_extended_id=True)
    messages = build_crc_msgs(msg)

    print("Starting to send a message with updating counter and checksum every 1 s for 8 s")
    task = BUS.send_periodic(msg, 1)
    assert isinstance(task, can.CyclicSendTaskABC)
    time.sleep(8)

    msg = can.Message(arbitration_id=0x12345678, data=[8, 9, 10, 11, 12, 13, 14, 0])
    messages = build_crc_msgs(msg)

    print("Sending modified message data every 1 s for 10 s")
    task.modify_data(messages)
    time.sleep(10)
    task.stop()
    print("stopped cyclic send")


def build_crc_msgs(msg):
    """
    Using the input message as base, create 16 messages with SAE J1939 SPN 3189 counters
    and SPN 3188 checksums placed in the final byte.
    """
    messages = []

    for counter in range(16):
        checksum = compute_xbr_checksum(msg, counter)
        msg.data[7] = counter + (checksum << 4)
        messages.append(
            can.Message(arbitration_id=msg.arbitration_id, data=msg.data[:])
        )

    return messages


def compute_xbr_checksum(message, counter):
    """
    Computes an XBR checksum per SAE J1939 SPN 3188.
    """
    checksum = sum(message.data[:7])
    checksum += sum(message.arbitration_id.to_bytes(length=4, byteorder="big"))
    checksum += counter & 0x0F
    xbr_checksum = ((checksum >> 4) + checksum) & 0x0F

    return xbr_checksum


if __name__ == "__main__":
    for interface, channel in [('socketcan', 'can0')]:
        print(f"Carrying out crc test with {interface} interface")

        with can.interface.Bus(channel='can0',interface='socketcan', bitrate=500000) as BUS:
            crc_send(BUS)

    time.sleep(2)
Exception has occurred: CanOperationError
Couldn't send CAN BCM frame due to OS Error: Invalid argument You are probably referring to a non-existing frame. [Error Code 22]
OSError: [Errno 22] Invalid argument

The above exception was the direct cause of the following exception:

  File "/home/pican/foobar/project/crc_3.py", line 30, in crc_send
    task = BUS.send_periodic(msg, 1)
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/pican/foobar/project/crc_3.py", line 78, in <module>
    crc_send(BUS)
can.exceptions.CanOperationError: Couldn't send CAN BCM frame due to OS Error: Invalid argument You are probably referring to a non-existing frame. [Error Code 22]

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