Microsoft Azure IoT Hub - Standard - S3 - fee - 1 unit per day

Rely on Microsoft Azure IoT Hub to easily and securely connect your Internet of Things (IoT) assets. Use device-to-cloud telemetry data to understand the state of your devices and assets, and be ready to take action when a device needs your attention. In cloud-to-device messages, reliably send commands and notifications to your connected devices - and track message delivery with acknowledgement receipts. Device messages are sent in a durable way to accommodate intermittently connected devices.