Wakaama LwM2M example client

This application starts a LwM2M client on the node with instances of the following objects:

The application is based on the Eclipse Wakaama example client .

Usage

Setting up a LwM2M Test Server

To test the client a LwM2M server where to register is needed. Eclipse Leshan demo is a good option for running one locally.

To run the demo server:

wget https://hudson.eclipse.org/leshan/job/leshan/lastSuccessfulBuild/artifact/leshan-server-demo.jar

java -jar ./leshan-server-demo.jar

It will output the addresses where it is listening:

INFO LeshanServer - LWM2M server started at coap://0.0.0.0/0.0.0.0:5683 coaps://0.0.0.0/0.0.0.0:5684
INFO LeshanServerDemo - Web server started at http://0.0.0.0:8080/.

Additionally, you can specify a binding address for the Leshan server, using the -lh option. For instance, if you are connecting from a node via a Border Router, you might want to specify:

java -jar ./leshan-server-demo.jar -lh fd00:dead:beef::1

Bootstrap server

LwM2M provides a bootstrapping mechanism to provide the clients with information to register to one or more servers. To test this mechanism both the previous server and a bootstrap server should be running. Eclipse Leshan also provides a bootstrap server demo.

By default the bootstrap server option is disabled, it can be enabled by defining CONFIG_LWM2M_BOOTSTRAP as 1 (see the Makefile in this application).

To run the bootstrap server, make sure that the ports it uses are different from the ones of previous server (default are 5683 for CoAP, 5684 for CoAPs, and 8080 for the webserver), and that it corresponds to the one set in lwm2m.h as CONFIG_LWM2M_BSSERVER_PORT:

# download demo
wget https://hudson.eclipse.org/leshan/job/leshan/lastSuccessfulBuild/artifact/leshan-bsserver-demo.jar

# set CoAP, CoAPs and webserver ports for bootstrap server
BS_COAPPORT=5685
BS_COAPSPORT=5686
BS_WEBPORT=8888

# run the server
java -jar ./leshan-bsserver-demo.jar --coapport ${BS_COAPPORT} \
            --coapsport ${BS_COAPSPORT} --webport ${BS_WEBPORT}

To set up the configuration of the node and the server:

Click the Add new client bootstrap configuration button.
Fill in the name of the device, it should match the one set in lwm2m.h as CONFIG_LWM2M_DEVICE_NAME.
Using the LWM2M Server tab enter the address where the LwM2M server is listening. For now only No security mode can be used.

Running the client

The address set as CONFIG_LWM2M_SERVER_URI (in lwm2m.h or via menuconfig) should be reachable from the node, e.g. either running on native with a tap interface or as a mote connected to a border router.

Also, if a bootstrap server is being used the macro CONFIG_LWM2M_BOOTSTRAP should be defined as 1.

The server URI for the example is being defined using the variable SERVER_URI in the Makefile, and can be changed when compiling.

Configure, compile and run

The Wakaama package can be configured via Kconfig. Its options are placed under Packages > Configure Wakaama LwM2M. To access the configuration interface you can run:

make menuconfig

For debugging purposes there are two types of messages that can be enabled:

The lwm2m client adaptation debug can be enabled by setting ENABLE_DEBUG in lwm2m_client.c and lwm2m_client_connection.c to 1
The wakaama internal logging can be enabled by setting CONFIG_LWM2M_WITH_LOGS, either on menuconfig or by adding it to CFLAGS (CFLAGS += -DCONFIG_LWM2M_WITH_LOGS).

For memory allocation the TLSF package is being used, with a private heap. If memory usage has to be tweaked the heap size can be modified via the option CONFIG_LWM2M_TLSF_BUFFER.

To compile run:

BOARD=<board> make clean all flash term

Shell commands

lwm2m start: Starts the LwM2M by configuring the module and registering to the server.

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