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Connect a lwM2M Device

OPC UA Introduction

lwM2M (Lightweight M2M)is a lightweight IoT device management protocol developed by OMA SpecWorks (Open Mobile Alliance). It is specifically designed for resource-constrained devices, such as low-power sensors and embedded devices, providing remote management capabilities for device management and services. LwM2M operates on the CoAP (Constrained Application Protocol) protocol stack and uses UDP or DTLS as the transport layer protocol, making it suitable for low-bandwidth and unstable network environments.

The following section describes how to use Shifu to connect devices via the lwM2M protocol.

Use/Not Use Security Mode​

There are two examples in example, lwM2MDeviceshifuWithoutSecurity and lwM2MDeviceShifuWithSecurity, which correspond to using security mode and not using security mode. The following will use the not using security mode as a reference.

Start Shifu's lwM2M Components​

start deviceshifu-lwM2M

$ kubectl apply -f examples/lwM2MDeviceshifuWithoutSecurity/lwM2M/
configmap/deviceshifu-lwm2m created
deployment.apps/deviceshifu-lwm2m-deployment created
service/deviceshifu-lwm2m-nosecurity created
edgedevice.shifu.edgenesis.io/edgedevice-lwm2m created

start mockdevice

$ kubectl apply -f examples/lwM2MDeviceshifuWithoutSecurity/mockdevice/
deployment.apps/leshan-client created

The kubectl command allows you to view the status of deviceShifu:

$ kubectl get pods -n deviceshifu
deviceshifu-lwm2m-deployment-86884bd4cd-gtfgz   1/1     Running   0             47s
leshan-client-587ff5fbc5-pz9tl                  1/1     Running   0             27s

Running Results​

Load nginxto the Kubernetes cluster:

$ kubectl run nginx --image=nginx -n deviceshifu

View nginx running status through kubectl:

$ kubectl get pods -n deviceshifu | grep nginx
nginx                                           1/1     Running   0   3m21s

Go to pod of nginx':

$ kubectl exec -it nginx -n deviceshifu -- bash

:::

提示

If you use security mode, replace deviceshifu-lwm2m-nosecurity with deviceshifu-lwm2m-security in the following command.

Issue an HTTP request to deviceShifu to get the data:

$ curl deviceshifu-lwm2m-nosecurity.deviceshifu.svc.cluster.local/float_value
3.14159

Issue an HTTP request to deviceShifu to write the data:

$ curl -X PUT deviceshifu-lwm2m-nosecurity.deviceshifu.svc.cluster.local/float_value -d 88.8
$ curl deviceshifu-lwm2m-nosecurity.deviceshifu.svc.cluster.local/float_value
Success 88.8