Microsoft Azure IoT Hub Free - fee - 1 unit per day

Connect, monitor and control millions of IoT assets running on a broad set of operating systems and protocols to jumpstart your Internet of Things project with the Azure IoT Hub. Control access rights to specific devices, if needed, to maintain the integrity of your system. Establish reliable bi-directional communication with these assets, even if they are intermittently connected, so you can analyze incoming telemetry data and send commands and notifications as needed. Enhance security of your IoT solutions by leveraging per-device authentication to communicate with devices with the appropriate credentials.