The disclosed technology is generally directed to device certification in an IoT environment. For example, such technology is usable in managing relationships between IoT devices and an IoT Hub. In one example of the technology, an IoT Hub receives a registration request. Next, the IoT Hub sends a registration verification to the IoT device. Next, the IoT Hub receives a ping from the IoT device. Next, the IoT Hub sends a response to the ping to the IoT device. Next, the IoT Hub receives verification of a validation of a log file output by a device based on running a plurality of unit tests on a device with a software development kit. Next, the IoT Hub automatically sends code to the IoT device.