What does simulating IoT hardware even mean to you? For example, most IoT stuff outputs one or more values when queried or when triggered. Are you looking for

What does simulating IoT hardware even mean to you? For example, most IoT stuff outputs one or more values when queried or when triggered. Are you looking for something which generates the values in a way which looks like IoT? That is, a random generator which will generate a temperature over time, or a random door sensor generator which will generate open/closed in a pattern similar to a real door? It seems to me that it would be almost trivial for you to write these random generators yourself and feed them with the distribution of (time,values) that you want to randomize. Or are you looking for more intricate simulation of jitters, failures, errors, flaws similar to real embedded IoT hardware? Can you elaborate?