slcan interface needs some time-tweaking (Possible solution provided)

[K1BSS]

Describe the bug

Messages are truncated while using send command.
Messages are truncated while using close command.

To Reproduce

Code as example. Requires python-can and pyserial modules.
Windows PC and CANable with original firmware: https://github.com/normaldotcom/canable-fw
Counter-interface: PCAN USB dongle and oscilloscoop

Problem 1: When looping messages within the "with can.Bus", one can see on the scope that the messages are corrupted/truncated.
Problem 2: When looping messages main, one can see that the last message in the "with can.Bus" is truncated.

Possible solution:
End the _write-function with: "time.sleep(3.0e-5)"
Begin the close-function with: "time.sleep(3.0e-5)"

Additional information, experimentally obtained:
10kbps: total fail (!)
20kpbs: requires 5.0e-3 seconds
50kpbs: requires 2.0e-3 seconds
83kpbs: requires 2.0e-3 seconds
100kpbs: requires 6.0e-4 seconds
125kpbs: requires 6.0e-4 seconds
250kpbs: requires 5.0e-5 seconds
500kpbs: requires 3.0e-5 seconds
750kpbs: other side (PCAN in this case) has no setting for 750, it has 800 which is not compatible
1000kpbs: requires 4.0e-6 seconds or even lower

Expected behavior

Truncated messages: seen on a oscilloscoop. PCAN viewer tels me stuffing errors. The error will result in resending infinite retrying messages.

Additional context

OS and version: Windows 11
Python version: Python 3.12
python-can version: 4.3.1
pyserial version: 3.5
python-can interface/s (if applicable): slcan
Hardware interface: CANable 2.0 Pro
IDE: PyCharm recent version
Oscilloscope: Rigol DS1000-series
Counter-interface: PCAN USB isolated version and PCAN-View software

Possible solution:
End the _write-function with: "time.sleep(3.0e-5)"
Begin the close-function with: "time.sleep(3.0e-5)"

Traceback and logs

None

See code example.

def send_one():
    with can.Bus(interface="slcan", channel="COM7@115200",  bitrate=500000, sleep_after_open=0.0) as bus:
        msg = can.Message(
            arbitration_id=0x555, data=[0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55, 0x55], is_extended_id=False
        )

        try:
            j = 0
            while j < 2:
                bus.send(msg)
                j = j + 1
        except can.CanError:
            print("Message NOT sent")


if __name__ == "__main__":
    i = 0
    while i < 2:
        send_one()
        i = i + 1