I was recently discussing self-answers in the IoT chat with Ghanima, and I think it's a good idea to bring this to everyone's attention: if you've recently encountered a problem and found your own solution (especially a problem that made you think, "surely someone else had this problem!"), asking and answering your own question here is not just permitted, but encouraged!
By doing this, you can help in multiple ways:
people searching for problems that you've already solved can find an answer, which helps them
you already know the relevant information to add to your question, so you can write a question with a sharp, clear focus
other people will find the site more easily if we have answers to common problems
you might even get a better solution to your problem!
So, go forth and share your solutions that you think might be useful, and let's try to put a stop to this, all too common, problem: