The market for wirelessly connected Internet of Things (IoT) devices is expected to grow explosively over the next few years, so developers are rushing to find the best platforms and tools with which to build their systems. But making the right choices can be challenging. Connectivity options include Classic Bluetooth and Bluetooth Smart (also called Bluetooth Low Energy or BLE) for point-to-point, Wi-Fi for IP gateways, or ZigBee and Thread for mesh networks that enable machine-to-machine connections.