Dropbear is a relatively small open source SSH 2 server. It runs on a variety of POSIX-based platforms.
The perfect environment for this server could be a little low-end system like your mobile phone or BeagleBone.
Installation:
| 1 | apt-get install dropbear | 
Configuration
vim /etc/default/dropbear
| 1 2 3 4 | NO_START=0 DROPBEAR_PORT=22 # Alternative dropbear login banner DROPBEAR_BANNER="/opt/dropbear-banner" | 

