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# [13676.718011] usb 1-1: new high-speed USB device number 3 using musb-hdrc
[13676.901065] option 1-1:1.0: GSM modem (1-port) converter detected
[13676.909600] option 1-1:1.1: GSM modem (1-port) converter detected
[13676.916634] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB1
[13676.926004] option 1-1:1.2: GSM modem (1-port) converter detected
[13676.933237] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB2
[13676.943394] option 1-1:1.3: GSM modem (1-port) converter detected
[13676.950619] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB3
[13676.960851] option 1-1:1.4: GSM modem (1-port) converter detected
[13676.968054] usb 1-1: GSM modem (1-port) converter now attached to ttyUSB4

# 
# ifconfig -a
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:25 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:2632 (2.5 KiB)  TX bytes:2632 (2.5 KiB)

usb0      Link encap:Ethernet  HWaddr 22:05:2C:1B:73:F2  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

# 
# ifconfig usb0 up
# 
# udhcpc -i usb0
udhcpc: started, v1.27.1
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
udhcpc: sending discover
^C
# 

# cat /usr/share/udhcpc/default.script
#!/bin/sh

# udhcpc script edited by Tim Riker <Tim@Rikers.org>

[ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1

RESOLV_CONF="/etc/resolv.conf"
[ -e $RESOLV_CONF ] || touch $RESOLV_CONF
[ -n "$broadcast" ] && BROADCAST="broadcast $broadcast"
[ -n "$subnet" ] && NETMASK="netmask $subnet"

case "$1" in
	deconfig)
		/sbin/ifconfig $interface up
		/sbin/ifconfig $interface 0.0.0.0

		# drop info from this interface
		# resolv.conf may be a symlink to /tmp/, so take care
		TMPFILE=$(mktemp)
		grep -vE "# $interface\$" $RESOLV_CONF > $TMPFILE
		cat $TMPFILE > $RESOLV_CONF
		rm -f $TMPFILE

		if [ -x /usr/sbin/avahi-autoipd ]; then
			/usr/sbin/avahi-autoipd -k $interface
		fi
		;;

	leasefail|nak)
		if [ -x /usr/sbin/avahi-autoipd ]; then
			/usr/sbin/avahi-autoipd -wD $interface --no-chroot
		fi
		;;

	renew|bound)
		if [ -x /usr/sbin/avahi-autoipd ]; then
			/usr/sbin/avahi-autoipd -k $interface
		fi
		/sbin/ifconfig $interface $ip $BROADCAST $NETMASK

		if [ -n "$router" ] ; then
			echo "deleting routers"
			while route del default gw 0.0.0.0 dev $interface 2> /dev/null; do
				:
			done

			for i in $router ; do
				route add default gw $i dev $interface
			done
		fi

		# drop info from this interface
		# resolv.conf may be a symlink to /tmp/, so take care
		TMPFILE=$(mktemp)
		grep -vE "# $interface\$" $RESOLV_CONF > $TMPFILE
		cat $TMPFILE > $RESOLV_CONF
		rm -f $TMPFILE

		# prefer rfc3359 domain search list (option 119) if available
		if [ -n "$search" ]; then
			search_list=$search
		elif [ -n "$domain" ]; then
			search_list=$domain
		fi

		[ -n "$search_list" ] &&
			echo "search $search_list # $interface" >> $RESOLV_CONF

		for i in $dns ; do
			echo adding dns $i
			echo "nameserver $i # $interface" >> $RESOLV_CONF
		done
		;;
esac

HOOK_DIR="$0.d"
for hook in "${HOOK_DIR}/"*; do
    [ -f "${hook}" -a -x "${hook}" ] || continue
    "${hook}" "${@}"
done

exit 0
# 
# 

echo ATE0 > /dev/ttyUSB3

# cat /dev/ttyUSB3 &
# 
# echo ATE0 > /dev/ttyUSB3
ATE0
# 
# echo ATI > /dev/ttyUSB3
AirM2M_720SG_V290_LTE_AT
OK
# 
# echo AT+CSTT="CMNET" > /dev/ttyUSB3
OK
# echo AT+CIICR > /dev/ttyUSB3
# 
CONNECT
OK
# echo AT+CIFSR > /dev/ttyUSB3
# 
10.152.249.168
#

# ifconfig -a
eth0      Link encap:Ethernet  HWaddr AC:00:00:CE:B4:38  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

usb0      Link encap:Ethernet  HWaddr 92:E6:A8:7C:97:DE  
          UP BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

# 
# udhcpc -i eth0
udhcpc: started, v1.27.1
[ 1398.968142] musb-hdrc musb-hdrc.1.auto: int hwep alloc failed for 1x16
ifconfig: SIOCSIFFLAGS: No space left on device
udhcpc: sending discover
udhcpc: sending select for 192.168.0.100
udhcpc: lease of 192.168.0.100 obtained, lease time 86400
deleting routers
adding dns 192.168.0.1
# 
# 
# ping 123.149.232.30
PING 123.149.232.30 (123.149.232.30): 56 data bytes
64 bytes from 123.149.232.30: seq=0 ttl=118 time=1473.042 ms
64 bytes from 123.149.232.30: seq=2 ttl=118 time=847.767 ms
64 bytes from 123.149.232.30: seq=3 ttl=118 time=554.274 ms
^C
--- 123.149.232.30 ping statistics ---
4 packets transmitted, 3 packets received, 25% packet loss
round-trip min/avg/max = 554.274/958.361/1473.042 ms
#