Unable to contact pilight from OpenHab via pilight binding

[hakan (Hakan Tandogan)]

First thing that comes to mind is that that instructable shows how to install OH1 version 1.5.1 which is pretty old at the moment. We are just in the process of creating the 1.8 release:

Upcoming 1.8 Release

Hi, i’d like to discuss the schedule for the upcoming 1.8 release with you, then maintainers @Kai, @watou, @steve1, @chris, @theo, @guessed, @hakan, @teichsta, @belovictor before announcing the schedule "officially. Kai and me would like to suggest the Jan. 11th 2016 as release date. What do you think? To achieve that schedule we would have to agree on some dates counting backwards from Jan 11th: Code Freeze (no more Major changes are accepted) (Dec. 16th, 2015) Last Review (Dec 23rd, 2015) …

So maybe you could try either with the latest 1.8 SNAPSHOT build from Jenkins or wait for a few more days for the final 1.8 build and retest with that?