You can configure an IP address using the micro-USB cable. It requires usbmode class and ecm configuration on the target (which sounds harder than it is).

Connect serial, micro-USB, and power cables to the dev kit.

Target

In a terminal, run:

minicom /dev/ttyUSB0

Press enter when Minicom starts.

Sign on as root user (no password required).

Press enter when prompted for a password.

cd to /etc/legato.

Run ls to list the files in the directory.

If an usbmode file doesn't exist, create one; or edit the existing one. Use vi text editor (already available on the target) to create or edit the usbmode file: add 'ecm' to the usbmode file.

In vi, it should look like something like this:

ecm
~
~
~
~
~
- usbmode 1/1 100%

Save usbmode to the /etc/legato location.

In vi, use commands ESC, then :x to save the usbmode file on the target.

Reboot your target.

On your target, run ifconfig. It should look something like this:

root@swi-mdm9x15:~# ifconfig                                                    
lo        Link encap:Local Loopback                                             
          inet addr:127.0.0.1  Mask:255.0.0.0                                   
          inet6 addr: ::1/128 Scope:Host                                        
          UP LOOPBACK RUNNING  MTU:16436  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:0                                             
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)                                
                                                                                
usb0      Link encap:Ethernet  HWaddr 32:E4:5E:6F:C4:3C                         
          inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0        
          inet6 addr: fe80::30e4:5eff:fe6f:c43c/64 Scope:Link                   
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1                    
          RX packets:197 errors:0 dropped:0 overruns:0 frame:0                  
          TX packets:57 errors:0 dropped:0 overruns:0 carrier:0                 
          collisions:0 txqueuelen:1000                                          
          RX bytes:32111 (31.3 KiB)  TX bytes:6725 (6.5 KiB)

Note that usb0 has an inet addr value. If it doesn't display an inet value, try rebooting the target and rerun ifconfig

Host

Open a new terminal on the host.

cd to your Legato directory.

Run bin/legs to set the Legato environment.

Run:

ifconfig usb0 <target ip addr> up

where the IP address subnet matches the target.

You may have to use sudo

local@LocalLinux:~$ sudo ifconfig usb0 192.168.1.20 up
[sudo] password for local: 
local@LocalLinux:~$

Run ifconfig again, it should look something like this:

eth0      Link encap:Ethernet  HWaddr 28:d2:44:36:bd:f6  
          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)

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:6407 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6407 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:618870 (618.8 KB)  TX bytes:618870 (618.8 KB)

usb0      Link encap:Ethernet  HWaddr 72:ee:fc:17:f3:61  
          inet6 addr: fe80::70ee:fcff:fe17:f361/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:25 errors:0 dropped:0 overruns:0 frame:0
          TX packets:210 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:5229 (5.2 KB)  TX bytes:42991 (42.9 KB)

wlan0     Link encap:Ethernet  HWaddr 00:c2:c6:13:a2:f9  
          inet addr:192.168.0.17  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::2c2:c6ff:fe13:a2f9/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:657272 errors:0 dropped:0 overruns:0 frame:0
          TX packets:114077 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:244778069 (244.7 MB)  TX bytes:15624212 (15.6 MB)

Ping target to host and vice versa to check everything is working.

Copyright (C) Sierra Wireless, Inc. 2014. Use of this work is subject to license.