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Both PPPoE and WWAN interfaces are dialer interfaces handled by ppp, but use
different CLI nodes for the same functionality. PPPoE has "connect-on-demand"
to initiate an "on-demand" dialing and WWAN uses "ondemand" for this purpose.
Rename WWAN "ondemand" node to "connect-on-demand".
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Commit 1c7d7cbd39 ("wwan: T2529: migrate device from ttyUSB to usbXbY.YpZ.Z")
added a new completion helper path for USB based serial interfaces. If no USB
based serial port was available on the system this produced the following
error: "ls: cannot access '/dev/serial/by-bus': No such file or directory"
Only list USB based serial interfaces if there is at least one connected to
the system.
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During testing it was discovered that there is a well known problem (we had for
ethernet interfaces) also in the serial port world. They will be enumerated and
mapped to /dev/ttyUSBxxx differently from boot to boot. This is especially
painful on my development APU4 board which also has a Sierra Wireless MC7710
LTE module installed.
The serial port will toggle between ttyUSB2 and ttyUSB5 depending on the
amount of serial port extenders attached (FT4232H).
The shipped udev rule (/usr/lib/udev/rules.d/60-serial.rules) partly solves
this by enumerating the devices into /dev/serial/by-id folder with their name
and serial number - it's a very good idea but I've found that not all of the
FT4232H dongles have a serial number programmed - this leads to the situation
that when you plug in two cables with both having serial number 0 - only one
device symlink will appear - the previous one is always overwritten by the
latter one.
Derive /usr/lib/udev/rules.d/60-serial.rules and create a /dev/serial/by-bus
directory and group devices by attached USB root port.
vyos@vyos:~$ find /dev/serial/by-bus/ -name usb* -exec basename {} \; | sort
usb0b1.3p1.0
usb0b1.3p1.2
usb0b1.3p1.3
usb0b2.4p1.0
usb0b2.4p1.1
usb0b2.4p1.2
usb0b2.4p1.3
So we have USB root 0 with bus 1.3 and port 1.0. The enumeration is constant
accross reboots.
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