In the comments on this question there is a discussion about whether questions about programming devices are on topic or not.
Let's take that discussion here on meta. Are questions like these on topic?
In this particular case, the question was about programming in Contiki. Contiki is an OS built specifically for small sensors - typical Things. Contiki is a peculiar beast in some senses, and it will generate questions that are quite specific, and might not be considered "general programming" questions.
I think questions about programming within IoT - with the specific restraints that we have in Things, and in the cloud of Things - should be considered on-topic.
Some embedded programming questions are probably off-topic. We've already seen a few examples that don't seem to be a good fit to this site. There are probably other sites where this type of question will be more common, and more users are potentially able to help.