iotivity-lite: A C repository from SiMet

Introduction

IoTivity-Lite is an open-source, reference implementation of the Open Connectivity Foundation (OCF) standards for the Internet of Things (IoT). Specifically, the stack realizes all the functionalities of the OCF Core Framework.

The challenge for the IoT ecosystem is to ensure that devices can connect securely and reliably to the Internet and to each other. The Open Connectivity Foundation (OCF), a group of industry leaders have created a standard specification and certification program to address these challenges.

The OCF Core Framework provides a versatile communications layer with best-in-class security for Device-to-Device (D2D) and Device-to-Cloud (D2C) connectivity over IP. IoT interoperability is achieved through the use of consensus-derived, industry standard data models spanning an array of usage verticals. The OCF Core Framework may be harnessed alongside other IoT technologies in a synergistic fashion to lend a comprehensive and robust IoT solution.

Please review the following resources for more details:

The IoTivity project was created to bring together the open-source community to accelerate the development of the framework and services required to connect the growing number of IoT devices. The IoTivity project offers device vendors and application developers royalty-free access to OCF technologies under the Apache 2.0 license.

IoTivity stack features

OS agnostic: The IoTivity device stack and modules work cross-platform (pure C code) and execute in an event-driven style. The stack interacts with lower level OS/hardware platform-specific functionality through a set of abstract interfaces. This decoupling of the common OCF standards related functionality from platform adaptation code promotes ease of long-term maintenance and evolution of the stack through successive releases of the OCF specifications.

Porting layer: The platform abstraction is a set of generically defined interfaces which elicit a specific contract from implementations. The stack utilizes these interfaces to interact with the underlying OS/platform. The simplicity and boundedness of these interface definitions allow them to be rapidly implemented on any chosen OS/target. Such an implementation constitutes a "port".
Optional support for static memory: On minimal environments lacking heap allocation functions, the stack may be configured to statically allocate all internal structures by setting a number of build-time parameters, which by consequence constrain the allowable workload for an application.
C and Java APIs: The API structure and naming closely aligns with OCF specification constructs, aiding ease of understanding.

Project directory structure

api/*: contains the implementations of client/server APIs, the resource model, utility and helper functions to encode/decode to/from OCF’s data model, module for encoding and interpreting type 4 UUIDs, base64 strings, OCF endpoints, and handlers for the discovery, platform and device resources.
messaging/coap/*: contains a tailored CoAP implementation.
security/*: contains resource handlers that implement the OCF security model.
utils/*: contains a few primitive building blocks used internally by the core framework.
onboarding_tool/*: contains the sample onboarding tool (OBT).
deps/*: contains external project dependencies.
deps/tinycbor/*: contains the tinyCBOR sources.
deps/mbedtls/*: contains the mbedTLS sources.
patches/*: contains patches for deps/mbedTLS and need to be applied once.
include/*: contains all common headers.
include/oc_api.h: contains client/server APIs.
include/oc_rep.h: contains helper functions to encode/decode to/from OCF’s data model.
include/oc_helpers.h: contains utility functions for allocating strings and arrays either dynamically from the heap or from pre-allocated memory pools.
include/oc_obt.h: contains the collection of APIs for security onboarding and provisioning.
port/*.h: collectively represents the platform abstraction.
port/<OS>/*: contains adaptations for each OS.
apps/*: contains sample OCF applications.
swig/*: contains instructions and code to build Java language bindings using the SWIG tool.

Build instructions

Grab source and dependencies using:

git clone --recursive https://github.com/iotivity/iotivity-lite.git

Please check here for build instructions:

Onboarding and Provisioning

Runing the onboarding tool

At this time there are four versions of the onboarding tool. The command line C version, the command line Java version, and the GUI Android version. Both command line versions are identical. It does not matter which version of the onboarding tool is used.

Fourth version of the onboarding tool is provided by the plgd/cloud project, reference implementation of the OCF Cloud. This one is available in both Apple App Store and Google Play Store.

The C version of the onboarding tool can be found in <iotivity-lite>/port/linux see Linux build instructions.

A Java version of the onboarding-tool can be found in <iotivity-lite>/swig/apps/java_onboarding_tool

The following instructions assume the onboarding tool has been built and can run.

Simple Step-by-Step guide for onboarding and provisioning

This guide assumes you are starting one discoverable device at a time. Multiple devices can be discovered and onboarded at the same time however it becomes the responsibility of the user to figure out which UUID belongs to which device.

Once you have successfully onboarded the samples the first time using the following step-by-step options feel free to RESET the devices and play around with different provisioning options.

The below steps use the command line version of the onboarding tool. The steps for the Android onboarding tool is very similar but are not described here.

(Step 1) Onboard and Provision the Server

There are multiple methods to onboard and provision server and client samples. Below is given one of the many possible ways the this could be done.

start the server sample

start onboarding tool it will print a menu with many option

Type 1 Enter to Discover un-owned devices

Type 8 Enter to Take ownership of device

Type 0 Enter. If you have multiple unowned devices you will have to select the correct device from the list.

Type 4 Enter to Discover owned devices the device you just took ownership of should be listed.

Type 13 Enter to Provision ACE2. There are many ways to properly provision the device. This will give instruction for using wildcard provisioning.

Type 0 Enter. If you have multiple unowned devices you will have to select the correct device from the list.

Type 1 Enter for an auth-crypt ACE

Type 1 Enter in response to Enter number of resources in this ACE:

Type 0 Enter in response to Have resource href? [0-No, 1-Yes]:

Type 1 Enter in response to Set wildcard resource? [0-No, 1-Yes]:

Type 2 Enter to select the All discoverable resources option

Type 0 Enter in response to Enter number of resource types [0-None]:

Type 0 Enter in response to Enter number of interfaces [0-None]

Type 0 Enter for CREATE, 1 Enter for RETRIEVE, 1 Enter for UPDATE, 0 Enter for DELETE, and 1 Enter for NOTIFY.

Successfully issued request to provision ACE should be printed on the screen upon success

(Step 2) Onboard the client

start the client sample

Type 1 Enter to Discover un-owned devices

Type 8 Enter to Take ownership of device

Type 0 Enter. If you have multiple unowned devices you will have to select the correct device from the list.

Type 2 Enter to Discover owned devices the server and client should be listed

(Step 3) Pair Server and Client

Start the client and server samples

Type 12 Enter to Provision pair-wise credentials

Type 0 Enter 1 Enter to pair the client and server. If you have multiple owned devices you will have to select the correct devices from the list.

(Step 4) Restart and Test

The samples should be onboarded and provisioned. Restart the server and then the client they should discover each other and run without difficulty.

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