Hello AWS IoT

The following code examples show how to get started using AWS IoT.

.NET

SDK for .NET (v4)

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

/// <summary>
/// Hello AWS IoT example.
/// </summary>
public class HelloIoT
{
    /// <summary>
    /// Main method to run the Hello IoT example.
    /// </summary>
    /// <param name="args">Command line arguments.</param>
    /// <returns>A Task object.</returns>
    public static async Task Main(string[] args)
    {
        var iotClient = new AmazonIoTClient();

        try
        {
            Console.WriteLine("Hello AWS IoT! Let's list your IoT Things:");
            Console.WriteLine(new string('-', 80));

            // Use pages of 10.
            var request = new ListThingsRequest()
            {
                MaxResults = 10
            };
            var response = await iotClient.ListThingsAsync(request);

            // Since there is not a built-in paginator, use the NextMarker to paginate.
            bool hasMoreResults = true;

            var things = new List<ThingAttribute>();
            while (hasMoreResults)
            {
                things.AddRange(response.Things);

                // If NextMarker is not null, there are more results. Get the next page of results.
                if (!String.IsNullOrEmpty(response.NextMarker))
                {
                    request.Marker = response.NextMarker;
                    response = await iotClient.ListThingsAsync(request);
                }
                else
                    hasMoreResults = false;
            }

            if (things is { Count: > 0 })
            {
                Console.WriteLine($"Found {things.Count} IoT Things:");
                foreach (var thing in things)
                {
                    Console.WriteLine($"- Thing Name: {thing.ThingName}");
                    Console.WriteLine($"  Thing ARN: {thing.ThingArn}");
                    Console.WriteLine($"  Thing Type: {thing.ThingTypeName ?? "No type specified"}");
                    Console.WriteLine($"  Version: {thing.Version}");

                    if (thing.Attributes?.Count > 0)
                    {
                        Console.WriteLine("  Attributes:");
                        foreach (var attr in thing.Attributes)
                        {
                            Console.WriteLine($"    {attr.Key}: {attr.Value}");
                        }
                    }
                    Console.WriteLine();
                }
            }
            else
            {
                Console.WriteLine("No IoT Things found in your account.");
                Console.WriteLine("You can create IoT Things using the IoT Basics scenario example.");
            }

            Console.WriteLine("Hello IoT completed successfully.");
        }
        catch (Amazon.IoT.Model.ThrottlingException ex)
        {
            Console.WriteLine($"Request throttled, please try again later: {ex.Message}");
        }
        catch (Exception ex)
        {
            Console.WriteLine($"Couldn't list Things. Here's why: {ex.Message}");
        }
    }
}

• For API details, see listThings in AWS SDK for .NET API Reference.

C++

SDK for C++

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;
}

• For API details, see listThings in AWS SDK for C++ API Reference.

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

Java

SDK for Java 2.x

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

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());
            });
    }
}

• For API details, see listThings in AWS SDK for Java 2.x API Reference.

Kotlin

SDK for Kotlin

Note

There's more on GitHub. Find the complete example and learn how to set up and run in the AWS Code Examples Repository.

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.fromEnvironment { 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}")
            }
        }
    }
}

• For API details, see listThings in AWS SDK for Kotlin API reference.