Where i can find sdk for RB400 series? Or i can develop in C and then compile it for ROS?
tnk u
There is no such thing. Users cannot contribute packages to ROS.
While RouterOS is primarily closed, there is always open source development opportunity.
Visit http://www.openwrt.org
Mikrotik supported products are found here:
http://wiki.openwrt.org/oldwiki/hardware/mikrotik
and of course there is the cool Debian install from Anthony at D’Youville College
http://opensource.dyc.edu/mips-devel
Tom