Can I use WiringPi on ROS indigo ?

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I have manage to get wiringPi and ROS working together. First step, you need to include in the CMakeList.txt where to find the lirary, for me it was:

FIND_LIBRARY(WIRINGPI_LIBRARY wiringPi /home/odroid/wiringPi)

The first parameter WIRINGPI_LIBRARY is just a name you give it which you will then use to refer within CMakeList. Second parameter is the library name and third parameter is the location on your system.

To use it, It depends on whether you're working using Python or C++.

1) For C++, include the library in your code and it would be something like this:

#include “wiringPi.h”       //include the library

………

wiringPiSetup();            //library setup function
pinMode(11,OUTPUT);         //set pin GPX2.1 as output. Based on wiringPi
//GPIO library map 

………

digitalWrite(11,data);      //write data(binary) to pin

And then in your CMakeList.txt, add the following:

add_executable(slave src/slave.cpp)
target_link_libraries(slave ${CATKIN_LIBRARIES} ${WIRINGPI_LIBRARY}
add_dependencies(slave beginner_tutorials_generate_messages_cpp wiringPi)

2) For python, I THINK its simply including the library in your code (not tested)

Look at the tutorials at http://wiki.ros.org/ROS/Tutorials

They show you how to set up a workspace to create ROS compatible code, and then publish or subscribe to messages in ROS. You would need to incorporate the code for subscribing into your code for wiringPi, assuming you want to control the pins based on messages received from a ROS topic