tools/mpremote: Use available ports instead of auto-connect list.

Using just the list of available ports, instead of a hard-coded list of
possible ports, means that all ports will be available for auto connection.
And the order that they will be attempted in will match what's printed by
"mpremote connect list" (and will be the same as before, trying ACMx before
USBx).  Auto-connect will also now work on Mac, and will allow all COM
ports on Windows.
Signed-off-by: Damien George <damien@micropython.org>

tools/mpremote/mpremote/main.py

@@ -25,21 +25,6 @@ from .console import Console, ConsolePosix
 
 _PROG = "mpremote"
 
-_AUTO_CONNECT_SEARCH_LIST = [
-    "/dev/ttyACM0",
-    "/dev/ttyACM1",
-    "/dev/ttyACM2",
-    "/dev/ttyACM3",
-    "/dev/ttyUSB0",
-    "/dev/ttyUSB1",
-    "/dev/ttyUSB2",
-    "/dev/ttyUSB3",
-    "COM0",
-    "COM1",
-    "COM2",
-    "COM3",
-]
-
 _BUILTIN_COMMAND_EXPANSIONS = {
     # Device connection shortcuts.
     "a0": "connect /dev/ttyACM0",
@@ -187,14 +172,12 @@ def do_connect(args):
             return None
         elif dev == "auto":
             # Auto-detect and auto-connect to the first available device.
-            ports = serial.tools.list_ports.comports()
-            for dev in _AUTO_CONNECT_SEARCH_LIST:
-                if any(p.device == dev for p in ports):
-                    try:
-                        return pyboard.PyboardExtended(dev, baudrate=115200)
-                    except pyboard.PyboardError as er:
-                        if not er.args[0].startswith("failed to access"):
-                            raise er
+            for p in sorted(serial.tools.list_ports.comports()):
+                try:
+                    return pyboard.PyboardExtended(p.device, baudrate=115200)
+                except pyboard.PyboardError as er:
+                    if not er.args[0].startswith("failed to access"):
+                        raise er
             raise pyboard.PyboardError("no device found")
         elif dev.startswith("id:"):
             # Search for a device with the given serial number.