1 Overview - AWS IoT ExpressLink
1.1 Goals

1 Overview

An AWS IoT ExpressLink qualified module is a hardware connectivity module that communicates with a host processor by means of a serial interface (UART) and allows it to quickly and securely access AWS IoT Core and its services. In so doing, an ExpressLink module offloads complex and undifferentiated workloads, such as authentication, device management, connectivity, and messaging, from the application (host) processor. ExpressLink modules were conceived after discussions with microcontroller vendors, OEMs, and module makers regarding the complexity and repetitiveness of migrating existing hardware and software designs to new or different MCUs and RTOSs. They enable a scalable migration for millions of embedded applications to cloud-connected applications.

1.1 Goals

The top-level goals are to:

  • Accelerate time to market for IoT devices.

  • Ease the transition to cloud connected solutions:

    • Reduce the skill gap required for cloud-connected embedded applications.

    • Allow OEMs to migrate existing designs by adding ExpressLink to existing applications with minimal modification to the existing application code.

  • Dramatically reduce the resources embedded devices require to connect to AWS IoT Core and publish and subscribe to topics, regardless of the connectivity solution chosen (Wi-Fi, ethernet, or cellular):

    • An abstract API does not reveal (leak) implementation details to the customer application.

    • Configuration parameters (implementation dependent) are easily isolated.

    • Requires minimal hardware connections with defined pinouts (two wire minimum).

    • Provides stateless module communication (command mode only, single configuration).

  • Support a hardware root of trust-based unique identity that allows for an optimal out-of-the-box experience and high-volume quick manufacturing, even when using untrusted Contract Manufacturers, by taking advantage of the AWS Multi Account Registration feature.

  • Provide a quick evaluation experience out-of-the-box without requiring an AWS account.

  • Simplify onboarding with an additional late binding option.

  • Offer easy updates over the air (and over the wire) so the module and host processor can ensure security throughout the life of the product.

  • Connect to standard AWS IoT Core services without additional cost and allow for heterogeneous fleets.