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I am link modem to pi3 via serial port and configure this port . When i receive data in my python software from serial port and save bytes in file, i note i receive too mutch data , I am receiving byte by byte , For example if transmited data from modem to pi3 was 1.5 kbyte , my softwre receive 5.5 k byte.

I note there is many line duplicated .

I use port. Read() Shul i use read until or read inwait? Can any one help me or explain this matter?

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    Not a Pi specific question. Wherever you ask this question you will need to show the code you used and an example of the output against the expected output.
    – joan
    Apr 4 at 12:25
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    import serial
                b = open("/home/pi/20", "wb")
                byte=port.read()
                num_byte+=1
                while True:
                       if byte== b'\x10':
                            x = port.read(1)
                            if x== b'\x03':
                                #b.write(b'\x10x\03')
                                print('end of file')
                                num_byte+=2
                                b.close()
                                break
                            
                            if x == b'\x10':
                                b.write(b'\x10')
                                byte = port.read(1)
                                num_byte+=1
                                continue
                            if x== b'\x1a':
                                b.write(b'\x10\x10')
                                num_byte+=2
                                byte = port.read(1)
                                continue
                            else:
                                
                               
                                byte = port.read(1)
                                num_byte+=2
                                continue

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