Device Monitor crashes when device is disabled

[zfields]

Temporary solution

Please take a look at the advanced seral monitor named CoolTerm.

---

I have a target device that "goes to sleep" by being externally disabled via the EN pin. When my device is disabled, the serial monitor crashes.

This is unfortunate, because I cannot connect to a port that is not open (i.e. a disabled device). I have no way to connect to the device unless it is running, which means I will miss all the startup logs.

I need the monitor to gracefully handle the loss of connection, await for the device to reappear, and reestablish the connection.

[ghost]

Exception in thread rx:
Traceback (most recent call last):
  File "/Users/michelle/.platformio/penv/lib/python3.8/site-packages/serial/serialposix.py", line 575, in read

--- exit ---
    buf = os.read(self.fd, size - len(read))
OSError: [Errno 6] Device not configured

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/Users/michelle/.platformio/penv/lib/python3.8/site-packages/serial/tools/miniterm.py", line 499, in reader
    data = self.serial.read(self.serial.in_waiting or 1)
  File "/Users/michelle/.platformio/penv/lib/python3.8/site-packages/serial/serialposix.py", line 581, in read
    raise SerialException('read failed: {}'.format(e))
serial.serialutil.SerialException: read failed: [Errno 6] Device not configured

[ivankravets]

I updated this issue with a temporary solution. I'm not sure that we can fix this on our side. A related issue #3939

[ivankravets]

Duplicate of #3939