serial 3G modem connection

["Andy Maginnis" <jam smru co uk>]

I have a 3G Telit modem with a USB and Serial connection. The usb
connection
works fine with network manager, but when I try and use the serial
connection
I see the following in the modem manager debug output

** (modem-manager:7380): DEBUG: (tty/ttyS0): could not get port's parent
device

The modem is attached to /dev/ttyS0 and I can get an internet connection
using
a manual pppd connection. It seems that my modem setting in NM are not
valid for
the modem when connected through the serial port.

How can I get this under networkManager control?

When I do run it manually I see the following output appear in the
network/modem manager
debug trace.

NetworkManager[7393]:    SCPlugin-Ifupdown: devices added (path:
/sys/devices/virtual/net/ppp0, iface: ppp0)
NetworkManager[7393]:    SCPlugin-Ifupdown: device added (path:
/sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration
found.
** (modem-manager:7380): DEBUG: (net/ppp0): could not get port's parent
device
NetworkManager[7393]:    SCPlugin-Ifupdown: devices removed (path:
/sys/devices/virtual/net/ppp0, iface: ppp0)