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How would you control a specific device on the Internet of Things? Sending a message to its IP address or using its URI seems logical, but what if it isn't powerful enough to have one? What if it isn't connected directly to the Internet? And, what if you want to send a message to a group of devices?
Alex proposes using CSS selectors for choosing which devices you want to talk to. By using classes and IDs (amongst other things) it's possible to send a message to very specific sets of devices in a way that any Web developer can understand.
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