One of the most commonly-used techniques for obtaining the desired data is by an HTTP GET call. Most of the IoT platforms that exist in the market have REST APIs exposed. There, we can send values from the device to the platform using an HTTP POST request, and at the same time get data by an HTTP GET request. Infact, in Chapter 2, Weather Station (IoT), where we used dweet.io to send data from a device, we used an SDK. Internally, the SDK also performs a similar HTTP POST call to send in data.