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platform device language
linux
Arduino Yun
c

Run a simple C sample on Arduino Yun device

Table of Contents

Introduction

About this document

The following document describes the process of connecting an Arduino Yun system to Azure IoT Hub.This multi-step process includes:

  • Configuring Azure IoT Hub
  • Registering your IoT device
  • Build and deploy Azure IoT SDK on device

Step 1: Prerequisites

You should have the following items ready before beginning the process:

Step 2: Prepare your Device

  • Connect the Arduino Yun using the mini-USB cable.
  • If you need to setup your Arduino Yun device, please refer the getting started instructions here .

Step 3: Build and Run the sample

Setup the development environment

This section shows you how to set up a development environment for the Azure IoT device SDK for C on Arduino Yun.

Install dependencies under root/sudo.

apt-get install curl libcurl4-openssl-dev uuid-dev uuid g++ make cmake git unzip openjdk-7-jre libssl-dev libncurses-dev subversion gawk
  • Clone this repository (azure-iot-sdks) to the machine you are using, being sure to do a recursive clone (git clone --recursive ).
  • Navigate to the folder c/build_all/arduino in your local copy of the repository.
  • Run the ./setup.sh script to install the OpenWRT SDK and prerequisites. By default, the SDK will be installed at ~/openwrt/sdk
  • (Optional) Enter 'Y' to build the Azure IoT SDK.
## Build the sample
  • Open the file c/serializer/samples/simplesample_http/simplesample_http.c in a text editor (for example nano)
  • Locate the following code in the file:
static const char* connectionString = "[device connection string]";
  • Replace "[device connection string]" with the device connection string you noted earlier. Save the changes.
  • Run the ./build.sh script in the c/build_all/arduino directory.
## Deploy the sample
  • Open a shell and navigate to the installed OpenWRT SDK folder. By default, it is ~/openwrt/sdk.
  • Transfer the sample executable.

OpenWRT Yun Image:

scp ~/openwrt/sdk/build_dir/target-mips_r2_uClibc-0.9.33.2/azure-iot-sdks-1/serializer/samples/simplesample_http/simplesample_http root@arduino.local:/tmp

LininoIO Yun Image:

scp ~/openwrt/sdk/build_dir/target-mips_r2_uClibc-0.9.33.2/azure-iot-sdks-1/serializer/samples/simplesample_http/simplesample_http root@linino.local:/tmp

Note: The uClibc version might be different on your setup and you might need to adjust the path accordingly.

Make sure the certificates are installed

On the Arduino Yun device, install the ca-certificates package like below:

wget https://downloads.openwrt.org/snapshots/trunk/ar71xx/generic/packages/base/ca-certificates_20160104_all.ipk --no-check-certificate
opkg install ca-certificates_20160104_all.ipk

You might get an error message at this step(return code 127), but the certificates will be installed.

Note: The certificate name mention above may change when newer version of certificate is released. If you get a 404 error while downloading the certificate file, please double check the CA certificate name under the base path here and update the certificate path accordingly.

## Run the sample
  • Run the sample /tmp/simplesample_http
  • See Manage IoT Hub for information about the tools you can use to monitor the messages your device sends to your IoT hub and to send commands to your devices.

Note: To send a command to the device from iothub-explorer or DeviceExplorer, the command should be like {"Name":"TurnFanOff","Parameters":{}}