AWS IoT
AWS IoT Device SDK for Embedded C

Documentation and API References:

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 includes an MQTT, JSON Parser, and AWS IoT Device Shadow library. It is distributed in source form and intended to be built into customer firmware along with application code, other libraries, and RTOS.

AWS IoT Device SDK for Embedded C v202009.00

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CSDK v4.0_beta deprecated