Standard SDK: [RTL8195AM] Google Cloud IoT

Introduction
Cloud IoT Core is a fully managed service that allows you to easily and securely connect, manage, and ingest data from millions of globally dispersed devices. Cloud IoT Core, in combination with other services on Google Cloud IoT platform, provides a complete solution for collecting, processing, analyzing, and visualizing IoT data in real time to support improved operational efficiency. 1 Device telemetry data is forwarded to a Cloud Pub/Sub topic, which can then be used to trigger Cloud Functions. You can also perform streaming analysis with Cloud Dataflow or custom analysis with your own subscribers. The following diagram summarizes the service components and the flow of data: 1 Realtek’s device- Ameba now supports the Google Cloud IoT MQTT Protocol to connect to the Cloud IoT and then publish the Telemetry.
Configure Google Cloud IoT Platform
  • Pre requirement
You can follow the Guide on google cloud website or the following steps. Google Cloud IoT guide is https://cloud.google.com/iot/docs/device_manager_guide?authuser=0 1. Select or create a Cloud Platform project Create a new Cloud Platform project or select a project from the projects list. 1 1 Step1: In the Cloud Platform Console, click the project Step2: At the project list page, select a project or click the Create project Step3: Input a Project name Step4: Click Create Remember the project_id which will be used in both Device Manager and Device. 2. Enable billing for your project Enable the billing for your project to use Google Cloud Platform features. https://support.google.com/cloud/answer/6293499#enable-billing 3. Enable the Cloud IoT Core API Register your application for Google Cloud IoT API in Google Cloud Platform. 1 Select the project and click Continue. 1 Click Continue, it will return to the DASHBOARD. 4. Create a Cloud Pub/Sub topic in the Cloud Platform Console Create a Cloud Pub/Sub topic for the Pub/Sub service. Step 1: Go to the Cloud PUB/SUB topics page, and Enable API 1 Step 2: Create a topic 1 Step 3: Input a topic name and click CREATE Remember the topic name for later usage. Step 4: In the Cloud Platform Console, select the topic and click the “SHOW INFO PANEL” button at the top of the page. This will open the IAM permissions editor in the right side panel. 1 Step 5: Add the member cloud-iot@system.gserviceaccount.com with the role Pub/Sub Publisher. Then click Add. 1
  • Install the gcloud CLI
Google Cloud SDK is a set of tools that you can use to manage resources and applications hosted on Google Cloud Platform. Here we use it to register a device. 1. Install the Google Cloud SDK Download the latest Google Cloud SDK from the following link and install it. https://cloud.google.com/sdk/docs/ 2. Update the gcloud components:
$ gcloud components update
3. Install the beta component
$ gcloud components install beta
If you’re using a Compute Engine VM, the default installation of gcloud will not allow you to update the components. To enable Cloud IoT Core on a Compute Engine VM, reinstall gcloud by running the following commands:
$ sudo apt-get remove google-cloud-sdk
$ curl https://sdk.cloud.google.com | bash
$ exec -l $SHELL
$ gcloud init
  • Registering a sample device
Before running the Ameba Google Cloud IoT example, you’ll need to create public/private key pairs, as well as a device and a registry to test with. These steps assume that you have already created a project called my-iot-project and a Cloud Pub/Sub topic called projects/my-iot-project/topics/device-events. (Substitute your project name and Pub/Sub topic as needed.) 1. Create a device registry A registry is a collection of devices. All device telemetry is published to the registry’s Cloud Pub/Sub topic, using Cloud Pub/Sub attributes to distinguish between different devices. To create a registry, run the following commands:
$ gcloud beta iot registries create my-registry 
--project=my-iot-project 
--region=us-central1 
--event-pubsub-topic=projects/my-iot-project/topics/device-events
–project=YOUR_PROJECT_ID: Fill in the project_id got before. Remember the registry_id which value is ‘my_registry’ in the above example command. 2. Create a public/private key pair This step shows you how to create an RSA key pair. Each device should be created with its own unique key. When connecting to Cloud IoT Core, each device creates a JWT signed with its private key, which Cloud IoT Core authenticates using the devices public key. Using OpenSSL to make an RSA key pair, run the following command:
$ openssl req -x509 -nodes -newkey rsa:2048 -keyout rsa_private.pem \
-out rsa_cert.pem -subj "/CN=unused"
You should now have two files: rsa_private.pem and rsa_cert.pem. 3. Create a device To create an RS256 authenticated device using the RSA certificate key, run the following commands:
$ gcloud beta iot devices create my-rs256-device
--project=my-iot-project
--region=us-central1
--registry=my-registry
--public-key path=rsa_cert.pem,type=rs256
–project=YOUR_PROJECT_ID: Fill in the project_id got before. Remember the device_id which value is ‘my-rs256-device’ in the above example command. 4. Create a Cloud Pub/Sub subscription You can also create a Cloud Pub/Sub subscription to receive telemetry events:
$ gcloud beta pubsub subscriptions create 
projects/my-iot-project/subscriptions/my-subscription 
--topic projects/my-iot-project/topics/device-events
Remember the subscription_id which value is ‘my-subscription’ in the above example command.
Setup the device
Copy and replace the patch files under 4.0b_patch_google_cloud_iot_nonNDA_(v02)\* to standard SDK sdk-ameba-v4.0b_without_NDA_GCC_V1.0.0\*.Make sure all the files in patch are copied to the SDK. 1. example_google_cloud_iot.c The file location is $sdk\component\common\example\google_cloud_iot\example_google_cloud_iot.c. Please fill below information of the device.
#define project_id "your_project_id"
#define registry_id "your_registry_id"
#define device_id "your_device_id"
#define count 100
static const unsigned char *private_key = \””
The project_id, registry_id and the device_id are set in the previous register device steps. The count is the number of telemetry you will publish. And the private_key is the content in the rsa_private.pem which generated by OpenSSL, remember fill it with LINE ENDING. For the LINE ENDING format, “ should be added at the beginning of each line, \n” \ should be added at the line end if this line is not the last one, and \n” should be added at the last line’s end. The following is the example to show the original pem key and the key after filled with LINE ending. The original is like following: 1 After adding the LINE ENDING: 1 You can also modify the value of payload which is the message to be published.
Verify example
  • Compile
1. IAR Ameba supports both CMSIS-DAP debugger and J-Link. You can refer UM0023 in sdk-ameba-v4.0b_without_NDA\doc\ UM0023 Realtek Ameba-1 build environment setup – iar.pdf to setup the IAR build environment. Step 1: Connect board to the PC with micro-USB cable. It requires installing “serial to USB driver” which can be found in sdk-ameba-v4.0b_without_NDA\tools\serial_to_usb\ mbedWinSerial_16466. 1 Step 2: Open IAR Workbench and open project, click File -> Open -> Workspace, then select project.eww in sdk-ameba-v4.0b_without_NDA\project\realtek_ameba1_va0_example\EWARM-RELEASE 1 Step3: Build project, click Project -> Rebuild All 1 Step 4: Download code, click Project -> Download -> Download active application 1 2. GCC You can refer UM0096 in sdk-ameba-v4.0b_without_NDA_GCC_V1.0.0\doc\ UM0096 Realtek Ameba build environment setup – gcc.pdf to setup the GCC build environment, it illustrates how to build the SDK under GCC environment on both Windows and Linux platform. Here just shows how to build on Windows 7 platform by using Cygwin. Step 1: Connect board to the PC with micro-USB cable. It requires installing “serial to USB driver” which can be found in sdk-ameba-v4.0b_without_NDA_GCC_V1.0.0\tools\serial_to_usb\ mbedWinSerial_16466. 1 Step 2: Open Cygwin terminal and use cd command to change directory to project\realtek_ameba1_va0_example\GCC-RELEASE
$ cd /cygdrive/SDK_LOCATION/project/realtek_ameba1_va0_example/GCC-RELEASE
1 Step3: Build project, use make command.
$ make
If the terminal contains “Image manipulating” output message means that the images have been built successfully. 1 Step 4: Download code. Copy the image file ram_all.bin in project\realtek_ameba1_va0_example\GCC-RELEASE\application\Debug\bin to the board which is the MBED 1
  • Run the device
Connect to Wi-Fi using AT command:
ATW0 Network set SSID
ATW1 Network set passphrase
ATW2 Network set Key ID
ATWC Join a network
For example, to connect an AP with WPA2 mode, the Command sequence:
#ATW0=SSID
#ATW1=passphrase
#ATWC
1 As soon as the Wi-Fi is connected, the example will start: 1 Publishing the payload failed: Steps taken to resolve issue: 1) Go to the Registries page in GCP Console 2) Under Default telemetry topic, change dropdown box from “NONE” to our created topic eg. Projects/ameba-1eb0c/topics/amebaTest 3) Update
  • Verify
Once the MQTT client is sending data to the endpoint, run the following command on Google Cloud SDK to read the data from your Cloud Pub/Sub topic:
$ gcloud beta pubsub subscriptions pull --auto-ack \
projects/my-iot-project/subscriptions/my-subscription
1
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