[serial] Support serial both by id, by path name

src/emdbg/serial/protocol.py

@@ -255,20 +255,20 @@ def is_alive(self, timeout: float = _TIMEOUT, attempts: int = 4) -> bool:
 @contextmanager
 def nsh(serial: str, baudrate: int = 57600):
     """
-    Opens a serial port with the `serial` number and closes it again.
+    Opens a serial port with the `serial` number or filepath and closes it again.
 
-    :param serial: the serial number of the port to connect to.
+    :param serial: the serial number or filepath (if contains '/') of the port to connect to.
     :param baudrate: the baudrate to use.
 
     :raises `SerialException`: if serial port is not found.
 
     :return: yields an initialized `Nsh` object.
     """
     nsh = None
-    port = find_serial_port(serial)
+    ttyDevice = serial if "/" in serial else find_serial_port(serial).device
     try:
         LOGGER.info(f"Starting on port '{serial}'..." if serial else "Starting...")
-        device = Serial(port.device, baudrate=baudrate)
+        device = Serial(ttyDevice, baudrate=baudrate)
         reader_thread = ReaderThread(device, lambda: _NshReader(device))
         with reader_thread as reader:
             nsh = Nsh(reader_thread, reader)