Better serial/port error message

[nofxx]

In a first use, lost some minutes figuring out this error... Thought it was some OS issue.

Traceback (most recent call last):
  File "/usr/bin/luatool.py", line 192, in <module>
    transport = decidetransport(args)
  File "/usr/bin/luatool.py", line 168, in decidetransport
    return SerialTransport(cliargs.port, cliargs.baud, cliargs.delay)
  File "/usr/bin/luatool.py", line 97, in __init__
    raise TransportError(e.strerror)
__main__.TransportError

Suggestion:

NO TTY: Please provide --port. Eg: /dev/ttyUSB*

PS.: A nice bet to detect tty is check for platform, linux: /dev/ttyUSB* mac: /dev/tty.usbmodel*
Thanks for the gem!
PS2: Thank you for this, great tool!

[siddharthsingh]

Use the command with sudo