YunSerialTerminal

One difference is that to enable public key based authentication for root, the authorized public keys need to be
 added to the following file (and not the usual /root/.ssh/authorized_keys):

vi /etc/dropbear/authorized_keys
chmod 0600 /etc/dropbear/authorized_keys

A complete tutorial for setting up public key based authentication on OpenWRT can be found here.

UNIX examples - many hacks

OSX Fuse - SSHFS

YUN websockets server

Yaler Example

Websockets Client

Download libwebsockets:

https://www.dropbox.com/s/r4lx1etrdaadc3o/libwebsockets_2014-03-01-388dc7d201d8d123841869fb49ec4d94d6dd7f54_ar71xx.ipk?dl=0

Download libwebsockets-examples:

https://www.dropbox.com/s/yt55xof23nte802/libwebsockets-examples_2014-03-01-388dc7d201d8d123841869fb49ec4d94d6dd7f54_ar71xx.ipk?dl=0

Dev Tools and Web Server Hacks

Extending Disk Space

Insert a microSD card and run the Expanding Space sketch
Install binutils so you have a linker, without this gcc is pretty useless

opkg update
opkg install binutils


Install make if you plan on using Makefiles

opkg install make


Install the yun-gcc package using a cached location for the downloaded file, this can take 15 to 20 minutes so be patient:

opkg -t /root install yun-gcc

So the problem is that you've lost your password?
Two workarounds:


    start the yun and wait a minute, load the yunserialterminal example, 
    open the serial monitor, press enter and see the prompt, type "passwd" 
    without the double quotes and change your password

    start the yun and wait a minute, the press and hold the reset button for 
    about 40 seconds (it's on the side, near the USB connector)
    

oot@showcontroller:~# df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
rootfs                    7168      3336      3832  47% /
/dev/root                 7680      7680         0 100% /rom
tmpfs                    30560       148     30412   0% /tmp
tmpfs                      512         0       512   0% /dev
/dev/mtdblock3            7168      3336      3832  47% /overlay
overlayfs:/overlay        7168      3336      3832  47% /
root@showcontroller:~# opkg install ./libwebsocket-examples.ipk
Installing libwebsockets-examples (2014-03-01-388dc7d201d8d123841869fb49ec4d94d6dd7f54) to root...

Bridge Library and Examples

run-sysupgrade /mnt/sda1/openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin

The output on the console will look like this:

run-sysupgrade /mnt/sda1/openwrt-ar71xx-generic-yun-16M-squashfs-sysupgrade.bin
Sending TERM to remaining processes ... uhttpd dbus-daemon dnsmasq avahi-daemon thd ntpd uSDaemon sleep syslogd klogd hotplug2 procd ubusd netifd
Sending KILL to remaining processes ...
Switching to ramdisk...
Performing system upgrade...
Unlocking firmware ...

Writing from <stdin> to firmware ...    
Upgrade completed
Rebooting system...