TypeError in slcan.py when formatting standard (non-extended) CAN frames

[felixavy]

A TypeError occurs in the _send_frame function of the TxWorker class inside the slcan.py driver when attempting to format standard (non-extended) CAN frames (frame.extended == False). The issue arises because the format string %03X incorrectly attempts to process both the marker (string) and frame.id (integer), but %X expects only an integer.

Code Snippet

def _send_frame(self, frame):
        marker = 'D' if frame.canfd else 'T'
        dlc_len = CANFrame.datalength_to_dlc(len(frame.data))
        line = '%s%X%s\r' % (('%c%08X' if frame.extended else 't%03X') % (marker, frame.id),
                             dlc_len,
                             binascii.b2a_hex(frame.data).decode('ascii'))

        self._conn.write(line.encode('ascii'))
        self._conn.flush()

Error Traceback
TypeError: %X format: an integer is required, not str

Proposed Fix
Adjust the formatting logic to separate the marker and frame.id when frame.extended == False, ensuring that only frame.id is passed to %03X.