This repository contains a LwM2M Client application example for Raspberry Pico devices, based on the open-source Anjay library and Raspberry Pi Pico SDK.
Example applications refer to Anjay Basic Client Tutorial and can guide through the creation of a basic LwM2M Client based on Anjay library step by step.
| Application | Description | Reference |
|---|---|---|
| Anjay Initialization | A minimum build environment for example client | doc link |
| Mandatory Objects | Mandatory LwM2M Objects necessary for setting up a connection with a server and an implementation of custom Anjay event loop | doc link |
| Secure Communication | Secure communication using PSK mode Note: randomness source does not meet requirements of security systems, see comments in the code |
doc link |
| Temperature Object with DS18B20 | Example Temperature Sensor object implementation using DS18B20 | doc link |
| Temperature Object with MPL3115A2 | Example Temperature Sensor object implementation using Adafruit MPL3115A2 | doc link |
To compile the client, you need Raspberry Pi Pico SDK and FreeRTOS kernel cloned into a base directory, parallel to this repository. Creating a workspace from scratch could look like this:
mkdir pico
cd pico
git clone -b 1.4.0 https://github.com/raspberrypi/pico-sdk.git
cd pico-sdk/ && git submodule update --init && cd ..
git clone -b V10.5.0 https://github.com/FreeRTOS/FreeRTOS-Kernel.git
git clone https://github.com/AVSystem/Anjay-pico-client.git
Your final working tree should look like this:
$ ls -1
Anjay-pico-client
FreeRTOS-Kernel
pico-sdk
To compile the application, you will need some tools.
sudo apt install cmake gcc-arm-none-eabi libnewlib-arm-none-eabi libstdc++-arm-none-eabi-newlib
After that, you can go to the Anjay-pico-client repository and build the project with <ssid> and <pass> replaced with your WIFI name and password respectively. LwM2M Client Endpoint Name is also configured by <endpoint_name> parameter.
cd Anjay-pico-client
git submodule update --init --recursive
mkdir build && cd build
cmake -DCMAKE_BUILD_TYPE=Debug -DWIFI_SSID="<ssid>" -DWIFI_PASSWORD="<pass>" -DENDPOINT_NAME="<endpoint_name>" .. && make -j
When building examples with security enabled (Secure Communication and Temperature Object), you need to provide PSK Identity and Key (by replacing <identity> and <psk> respectively with values entered in Coiote LwM2M Server)
cmake -DCMAKE_BUILD_TYPE=Debug -DWIFI_SSID="<ssid>" -DWIFI_PASSWORD="<pass>" -DENDPOINT_NAME="<endpoint_name>" -DPSK_IDENTITY="<identity>" -DPSK_KEY="<psk>" .. && make -j
This should generate directories named after examples that contain, among others, files with .uf2 and .hex extensions. .uf2 files can be programmed through the bootloader and .hex are for programming using a debugger and SWD connection.
To program using the bootloader, press BOOTSEL button while connecting Raspberry Pi Pico W through a USB cable. It should be recognized then as a Mass Storage device, where you can copy the .uf2 file, Pico will be programmed, reset and start running the code.
Default serial port connection is located at pins GP0 - TX and GP1 - RX, use for example Serial to USB converter and connect it to those pins to receive stdout messages.
To connect to Coiote IoT Device Management LwM2M Server, please register at https://eu.iot.avsystem.cloud/. There is a guide showing basic usage of Coiote DM
available on IoT Developer Zone. For the Mandatory Objects example that has no connection security enabled, simply select NoSec as Security Mode in the Guide step 3.