Reconnecting with pySerial

Question

I'm trying to write a function which continuously reads serial input. The function must be able to handle unexpected disconnections from the serial port and reconnect when possible. Despite reading several question posts on stackOverflow and looking through the pySerial documentation, I have yet to find a solution.

Here's my code:

def serialRead(serialPort, queue):
    """Adds serial port input to a queue."""

    ser = serial.Serial(serialPort - 1, timeout = 2)

    ser.parity = "O"
    ser.bytesize = 7

    while(True):
        try:
            if(ser == None):
                ser = serial.Serial(serialPort - 1, timeout = 2)

                ser.parity = "O"
                ser.bytesize = 7

                print("Reconnecting")

            queue.put(ser.read(27))
            ser.write(chr(6).encode())

            print("Writing Data...")

        except:
            if(not(ser == None)):
                ser.close()
                ser = None
                print("Disconnecting")

            print("No Connection")
            time.sleep(2)

Here's my output:

Enter a Serial Port: 7
Writing Data...
Writing Data...
Writing Data...
Writing Data...

I start with my device connected. After leaving the program run, neither "Disconnecting" or "No Connection" display and the program stops (it doesn't crash).

Answer 1

This code works. Batman tested the program on an Arduino connection and I found that my program had successfully reconnected with the device after a period of time. I hope this code will be useful for those struggling with something similar.