How to stop Xmodem after bin file transfer was finished

[shaya2103]

hello freinds,


I am sending a BIN file successfully to my energy meter through serial port using the code in the bottom. My problem is that Xmodem doesn't stop after all 128 blocks where sent and i have no idea how to break from it and communicate again with my meter.

Please your kind help.

def sendFile():
    fileSize = os.path.getsize('104_new.BIN')
    total = math.ceil(fileSize /128) 
    ser= serialPort.serialport
    ser.flushInput()
    print (ser)

    def getc(size, timeout=0):
        gbytes = ser.read(1)
        #sleep(0.008)
        print(f'Read Byte: {gbytes}')
        return gbytes or None


    def putc(data, timeout=0):
        pbytes = ser.write(data)
        sleep(0.2)
        print(f'Put Byte: {pbytes}')
        return pbytes or None

    modem =XMODEM(getc,putc)
    f = open('104_new.BIN', "rb")
    modem.send(f,retry=50,callback=total)
    f.close()
    ser.close()
    ser.flushOutput()
    senddata_edit.insert(0,'scan\r')

this is the error code i get:

Error:
send error: expected ACK; got None
Exception in thread Thread-2:
Traceback (most recent call last):
  File "C:\Users\shay\AppData\Local\Programs\Python\Python37-32\lib\threading.py", line 926, in _bootstrap_inner
    self.run()
  File "C:\Users\shay\AppData\Local\Programs\Python\Python37-32\lib\threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "C:\PythonTerminal-master\PythonTerminal-master\mainpy2.py", line 211, in sendFile
    status= modem.send(f,retry=50,timeout=0)
  File "C:\Users\shay\AppData\Local\Programs\Python\Python37-32\lib\site-packages\xmodem\__init__.py", line 349, in send
    self.putc(EOT)
  File "C:\PythonTerminal-master\PythonTerminal-master\mainpy2.py", line 203, in putc
    pbytes = ser.write(data)
  File "C:\Users\shay\AppData\Local\Programs\Python\Python37-32\lib\site-packages\serial\serialwin32.py", line 315, in write
    raise SerialException("WriteFile failed ({!r})".format(ctypes.WinError()))
serial.serialutil.SerialException: WriteFile failed (OSError(9, 'The handle is invalid.', None, 6))