KubeEdge WeChat Demo

Firstly the users input kubeedge to get the music tracks which can be played, and then the users input play <track> to play the music, at last the expected track is pushed to the edge node and the track is played on the speaker connected to the edge node.

Prerequisites

Hardware Prerequisites

• RaspBerry PI (RaspBerry PI 3 has been used for this demo). The RaspBerry PI is also the edge node to which the speaker will be connected.

• A speaker for playing the music.

Software Prerequisites

• A running Kubernetes cluster.

• KubeEdge 0.3.0 See instructions on how to setup KubeEdge.

  Note:

  when you setup edgecore on the RaspBerry PI, Please set the mqtt mode into 2 in this line, and replace 0.0.0.0 with your Kubernetes master ip address in this line.

• In order to control the speaker and play the expected track, we need to manage the speaker connected to the RaspBerry PI. KubeEdge allows us to manage devices using Kubernetes custom resource definitions. The design proposal is here. Apply the CRD schema yamls available here using kubectl.

Steps to run the demo

Clone demo code

$ git clone https://github.com/edisonxiang/kubeedge-wechat-demo

Create the device model and device instance for the speaker

With the Device CRD APIs now installed in the cluster, we create the device model and instance for the speaker using the yaml files.

$ cd $GOPATH/src/github.com/edisonxiang/kubeedge-wechat-demo/kubeedge-wechat-app/deployments/
$ kubectl create -f kubeedge-speaker-model.yaml
$ kubectl create -f kubeedge-speaker-instance.yaml

Create Secret for WeChat Credentials

The KubeEdge WeChat App in the demo needs to serve behind WeChat. For this the application needs to sign the requests with a WeChat Account. Create a Kubernetes Secret wechatsecret with the credentials as below:

kubectl create secret generic wechatsecret \
--from-literal=AppID=<Your_WeChat_AppID> \
--from-literal=AppSecret=<Your_WeChat_AppSecret> \
--from-literal=Token=<Your_WeChat_Token> \
--from-literal=EncodingAESKey=<Your_WeChat_EncodingAESKey>

Run KubeEdge WeChat App

The KubeEdge WeChat App runs in a VM on cloud and serve for WeChat. It can be deployed using a Kubernetes deployment yaml.

$ cd $GOPATH/src/github.com/edisonxiang/kubeedge-wechat-demo/kubeedge-wechat-app/deployments/
$ kubectl create -f kubeedge-wechat-app.yaml

Build PI Player App

Cross-complie the PI Player App which will run on the RaspBerry PI and play the expected track.

$ cd $GOPATH/src/github.com/edisonxiang/kubeedge-wechat-demo/pi-player-app/
$ export GOARCH=arm
$ export GOOS="linux"
$ export GOARM=6
$ export CGO_ENABLED=1
$ export CC=arm-linux-gnueabi-gcc
$ go build -o pi-player-app main.go

Run PI Player App

Make sure the MQTT broker is running on the RaspBerry PI. Copy the PI Player App binary to the RaspBerry PI and run it. The App will subscibe to the $hw/events/device/speaker-01/twin/update/document topic and when it receives the expected track on the topic, it will play it on the speaker. At last, you need to copy the music files into the folder /home/pi/music/ on the RaspBerry PI. The music file name is like .mp3, for example: 1.mp3

The PI Player App will issue the omxplayer to play music, please make sure the omxplayer is installed on the RaspBerry PI. If not, please see the following link to setup omxplayer.

https://raspberry-projects.com/pi/software_utilities/media-players/omxplayer

$ ./pi-player-app

Play music by visiting WeChat Subscription Account

• Visit to the WeChat Subscription Account.

• Input kubeedge to get the music tracks which can be played.

• Input play <track> to play the music, the track info is pushed to the RaspBerry PI and the music is played on the speaker.

• Input stop to stop the music, the music is stopped on the speaker.