Code examples for AWS IoT using AWS SDKs

Code for the CMakeLists.txt CMake file.

# Set the minimum required version of CMake for this project.
cmake_minimum_required(VERSION 3.13)

# Set the AWS service components used by this project.
set(SERVICE_COMPONENTS iot)

# Set this project's name.
project("hello_iot")

# Set the C++ standard to use to build this target.
# At least C++ 11 is required for the AWS SDK for C++.
set(CMAKE_CXX_STANDARD 11)

# Use the MSVC variable to determine if this is a Windows build.
set(WINDOWS_BUILD ${MSVC})

if (WINDOWS_BUILD) # Set the location where CMake can find the installed libraries for the AWS SDK.
    string(REPLACE ";" "/aws-cpp-sdk-all;" SYSTEM_MODULE_PATH "${CMAKE_SYSTEM_PREFIX_PATH}/aws-cpp-sdk-all")
    list(APPEND CMAKE_PREFIX_PATH ${SYSTEM_MODULE_PATH})
endif ()

# Find the AWS SDK for C++ package.
find_package(AWSSDK REQUIRED COMPONENTS ${SERVICE_COMPONENTS})

if (WINDOWS_BUILD AND AWSSDK_INSTALL_AS_SHARED_LIBS)
    # Copy relevant AWS SDK for C++ libraries into the current binary directory for running and debugging.

    # set(BIN_SUB_DIR "/Debug") # If you are building from the command line, you may need to uncomment this
    # and set the proper subdirectory to the executables' location.

    AWSSDK_CPY_DYN_LIBS(SERVICE_COMPONENTS "" ${CMAKE_CURRENT_BINARY_DIR}${BIN_SUB_DIR})
endif ()

add_executable(${PROJECT_NAME}
        hello_iot.cpp)

target_link_libraries(${PROJECT_NAME}
        ${AWSSDK_LINK_LIBRARIES})

Code for the hello_iot.cpp source file.

#include <aws/core/Aws.h>
#include <aws/iot/IoTClient.h>
#include <aws/iot/model/ListThingsRequest.h>
#include <iostream>

/*
 *  A "Hello IoT" starter application which initializes an AWS IoT client and
 *  lists the AWS IoT topics in the current account.
 *
 *  main function
 *
 *  Usage: 'hello_iot'
 *
 */

int main(int argc, char **argv) {
    Aws::SDKOptions options;
    //  Optional: change the log level for debugging.
    //  options.loggingOptions.logLevel = Aws::Utils::Logging::LogLevel::Debug;
    Aws::InitAPI(options); // Should only be called once.
    {
        Aws::Client::ClientConfiguration clientConfig;
        // Optional: Set to the AWS Region (overrides config file).
        // clientConfig.region = "us-east-1";

        Aws::IoT::IoTClient iotClient(clientConfig);
        // List the things in the current account.
        Aws::IoT::Model::ListThingsRequest listThingsRequest;

        Aws::String nextToken; // Used for pagination.
        Aws::Vector<Aws::IoT::Model::ThingAttribute> allThings;

        do {
            if (!nextToken.empty()) {
                listThingsRequest.SetNextToken(nextToken);
            }

            Aws::IoT::Model::ListThingsOutcome listThingsOutcome = iotClient.ListThings(
                    listThingsRequest);
            if (listThingsOutcome.IsSuccess()) {
                const Aws::Vector<Aws::IoT::Model::ThingAttribute> &things = listThingsOutcome.GetResult().GetThings();
                allThings.insert(allThings.end(), things.begin(), things.end());
                nextToken = listThingsOutcome.GetResult().GetNextToken();
            }
            else {
                std::cerr << "List things failed"
                          << listThingsOutcome.GetError().GetMessage() << std::endl;
                break;
            }
        } while (!nextToken.empty());

        std::cout << allThings.size() << " thing(s) found." << std::endl;
        for (auto const &thing: allThings) {
            std::cout << thing.GetThingName() << std::endl;
        }
    }

    Aws::ShutdownAPI(options); // Should only be called once.
    return 0;
}

import software.amazon.awssdk.regions.Region;
import software.amazon.awssdk.services.iot.IotClient;
import software.amazon.awssdk.services.iot.model.ListThingsRequest;
import software.amazon.awssdk.services.iot.model.ListThingsResponse;
import software.amazon.awssdk.services.iot.model.ThingAttribute;
import software.amazon.awssdk.services.iot.paginators.ListThingsIterable;

import java.util.List;

public class HelloIoT {
    public static void main(String[] args) {
        System.out.println("Hello AWS IoT. Here is a listing of your AWS IoT Things:");
        IotClient iotClient = IotClient.builder()
            .region(Region.US_EAST_1)
            .build();

        listAllThings(iotClient);
    }

    public static void listAllThings(IotClient iotClient) {
        iotClient.listThingsPaginator(ListThingsRequest.builder()
                .maxResults(10)
                .build())
            .stream()
            .flatMap(response -> response.things().stream())
            .forEach(attribute -> {
                System.out.println("Thing name: " + attribute.thingName());
                System.out.println("Thing ARN: " + attribute.thingArn());
            });
    }
}

import aws.sdk.kotlin.services.iot.IotClient
import aws.sdk.kotlin.services.iot.model.ListThingsRequest

suspend fun main() {
    println("A listing of your AWS IoT Things:")
    listAllThings()
}

suspend fun listAllThings() {
    val thingsRequest =
        ListThingsRequest {
            maxResults = 10
        }

    IotClient { region = "us-east-1" }.use { iotClient ->
        val response = iotClient.listThings(thingsRequest)
        val thingList = response.things
        if (thingList != null) {
            for (attribute in thingList) {
                println("Thing name ${attribute.thingName}")
                println("Thing ARN: ${attribute.thingArn}")
            }
        }
    }
}