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The AWS IoT Device SDK for Embedded C (C-SDK) is a collection of C source files under the MIT open source license that can be used in embedded applications to securely connect IoT devices to AWS IoT Core. It contains MQTT client, HTTP client, JSON Parser, AWS IoT Device Shadow, AWS IoT Jobs, and AWS IoT Device Defender libraries. This SDK is distributed in source form and can be built into customer firmware along with application code, other libraries, and an operating system (OS) of your choice. These libraries are only dependent on standard C libraries, so they can be ported to various OS's - from embedded Real-Time Operating Systems (RTOS) to Linux/Mac/Windows. ...

...The device’s shadow is a persistent, virtual representation of your device that you can interact with from AWS IoT Core even if the device is offline. The device state is captured as its “shadow” within a JSON document. The device can send commands over MQTT to get, update and delete its latest state as well as receive notifications over MQTT about changes in its state. Each device’s shadow is uniquely identified by the name of the corresponding “thing”, a representation of a specific device or logical entity on the AWS Cloud. See Managing Devices with AWS IoT for more information on IoT "thing". ...

The C-GM Counter is a low cost (<50$) DIY Hardware & Firmware for building a Connected Geiger-Müller counter device to record beta-gamma radiation levels. The counter is the hardware part of the overall A-GM project aimed for providing a long-term continuous measurement of the radioactivity level. see also A-GM Manager at https://www.instructables.com/id/DIY-Radioactivity-Counter-IoT-and-Eco-system/ ** IMPORTANT ** : From v1.4, Arduino Nano require Optiboot bootloader to work, other...