# Matter EFR32 EVSE Example

An example showing the use of CHIP on the Silicon Labs EFR32 MG12 and MG24.

<hr>

-   [Matter EFR32 EVSE Example](#matter-efr32-evse-example)
    -   [Introduction](#introduction)
    -   [Building](#building)
    -   [Flashing the Application](#flashing-the-application)
    -   [Viewing Logging Output](#viewing-logging-output)
        -   [SEGGER RTT](#segger-rtt)
        -   [Console Log](#console-log)
            -   [Configuring the VCOM](#configuring-the-vcom)
        -   [Using the console](#using-the-console)
    -   [Running the Complete Example](#running-the-complete-example)
        -   [Notes](#notes)
    -   [Running RPC console](#running-rpc-console)
    -   [Device Tracing](#device-tracing)
    -   [Memory settings](#memory-settings)
    -   [OTA Software Update](#ota-software-update)
    -   [Group Communication (Multicast)](#group-communication-multicast)
    -   [Building options](#building-options)
        -   [Disabling logging](#disabling-logging)
        -   [Debug build / release build](#debug-build--release-build)
        -   [Disabling LCD](#disabling-lcd)
        -   [KVS maximum entry count](#kvs-maximum-entry-count)

<hr>

> **NOTE:** Silicon Laboratories now maintains a public matter GitHub repo with
> frequent releases thoroughly tested and validated. Developers looking to
> develop matter products with silabs hardware are encouraged to use our latest
> release with added tools and documentation.
> [Silabs Matter Github](https://github.com/SiliconLabs/matter/releases)

## Introduction

The EFR32 EVSE example provides a baseline demonstration of a EVSE device, built
using Matter and the Silicon Labs gecko SDK. It can be controlled by a Chip
controller over an Openthread or Wifi network.

The EFR32 device can be commissioned over Bluetooth Low Energy where the device
and the Chip controller will exchange security information with the Rendez-vous
procedure. If using Thread, Thread Network credentials are then provided to the
EFR32 device which will then join the Thread network.

If the LCD is enabled, the LCD on the Silabs WSTK shows a QR Code containing the
needed commissioning information for the BLE connection and starting the
Rendez-vous procedure.

The EVSE examples is intended to serve both as a means to explore the workings
of Matter EVSE as well as a template for creating real products based on the
Silicon Labs platform.

## Building

-   Download the
    [Simplicity Commander](https://www.silabs.com/mcu/programming-options)
    command line tool, and ensure that `commander` is your shell search path.
    (For Mac OS X, `commander` is located inside
    `Commander.app/Contents/MacOS/`.)

-   Download and install a suitable ARM gcc tool chain:
    [GNU Arm Embedded Toolchain 9-2019-q4-major](https://developer.arm.com/tools-and-software/open-source-software/developer-tools/gnu-toolchain/gnu-rm/downloads)

-   Install some additional tools (likely already present for CHIP developers):

    -   Linux: `sudo apt-get install git ninja-build`

    -   Mac OS X: `brew install ninja`

-   Supported hardware:

    -   > For the latest supported hardware please refer to the
        > [Hardware Requirements](https://github.com/SiliconLabs/matter/blob/latest/docs/silabs/general/HARDWARE_REQUIREMENTS.md)
        > in the Silicon Labs Matter Github Repo

    MG24 boards :

    -   BRD2601B / SLWSTK6000B / Wireless Starter Kit / 2.4GHz@10dBm
    -   BRD2703A / SLWSTK6000B / Wireless Starter Kit / 2.4GHz@10dBm
    -   BRD4186A / SLWSTK6006A / Wireless Starter Kit / 2.4GHz@10dBm
    -   BRD4186C / SLWSTK6006A / Wireless Starter Kit / 2.4GHz@10dBm
    -   BRD4187A / SLWSTK6006A / Wireless Starter Kit / 2.4GHz@20dBm
    -   BRD4187C / SLWSTK6006A / Wireless Starter Kit / 2.4GHz@20dBm
    -   BRD2703A / MG24 Explorer Kit
    -   BRD2704A / SparkFun Thing Plus MGM240P board

*   Build the example application:

                    cd ~/connectedhomeip
                    ./scripts/examples/gn_silabs_example.sh ./examples/evse-app/silabs/ ./out/evse-app BRD4187C

-   To delete generated executable, libraries and object files use:

                    $ cd ~/connectedhomeip
                    $ rm -rf ./out/

    OR use GN/Ninja directly

                    $ cd ~/connectedhomeip/examples/evse-app/silabs
                    $ git submodule update --init
                    $ source third_party/connectedhomeip/scripts/activate.sh
                    $ export SILABS_BOARD=BRD4187C

    To build the EVSE example

                    $ gn gen out/debug
                    $ ninja -C out/debug

    To change Device Energy Management feature support (e.g. Power forecast or
    State forecast reporting), you can change the args to gn gen (see BUILD.gn
    for arg options)

                    $ gn gen out/debug --args='sl_dem_support_state_forecast_reporting=true sl_dem_support_power_forecast_reporting=false'
                    $ ninja -C out/debug

-   To delete generated executable, libraries and object files use:

                    $ cd ~/connectedhomeip/examples/evse-app/silabs
                    $ rm -rf out/

*   Build the example as Intermittently Connected Device (ICD)

                    $ ./scripts/examples/gn_silabs_example.sh ./examples/evse-app/silabs/ ./out/evse-app_ICD BRD4187C --icd

*   Build the example with pigweed RPC

                    $ ./scripts/examples/gn_silabs_example.sh examples/evse-app/silabs/ out/evse_app_rpc BRD4187C 'import("//with_pw_rpc.gni")'

    or use GN/Ninja Directly

                    $ cd ~/connectedhomeip/examples/evse-app/silabs
                    $ git submodule update --init
                    $ source third_party/connectedhomeip/scripts/activate.sh
                    $ export SILABS_BOARD=BRD4187C
                    $ gn gen out/debug --args='import("//with_pw_rpc.gni")'
                    $ ninja -C out/debug

    [Running Pigweed RPC console](#running-rpc-console)

For more build options, help is provided when running the build script without
arguments

         ./scripts/examples/gn_silabs_example.sh

## Flashing the Application

-   On the command line:

                    $ cd ~/connectedhomeip/examples/evse-app/silabs
                    $ python3 out/debug/matter-silabs-evse-example.flash.py

-   Or with the Ozone debugger, just load the .out file.

All EFR32 boards require a bootloader, see Silicon Labs documentation for more
info. Pre-built bootloader binaries are available in the Assets section of the
Releases page on
[Silabs Matter Github](https://github.com/SiliconLabs/matter/releases) .

## Viewing Logging Output

### SEGGER RTT

The example application is built to use the SEGGER Real Time Transfer (RTT)
facility for log output. RTT is a feature built-in to the J-Link Interface MCU
on the WSTK development board. It allows bi-directional communication with an
embedded application without the need for a dedicated UART.

Using the RTT facility requires downloading and installing the _SEGGER J-Link
Software and Documentation Pack_
([web site](https://www.segger.com/downloads/jlink#J-LinkSoftwareAndDocumentationPack)).

Alternatively, SEGGER Ozone J-Link debugger can be used to view RTT logs too
after flashing the .out file.

-   Download the J-Link installer by navigating to the appropriate URL and
    agreeing to the license agreement.

-   [JLink_Linux_x86_64.deb](https://www.segger.com/downloads/jlink/JLink_Linux_x86_64.deb)
-   [JLink_MacOSX.pkg](https://www.segger.com/downloads/jlink/JLink_MacOSX.pkg)

*   Install the J-Link software

                    $ cd ~/Downloads
                    $ sudo dpkg -i JLink_Linux_V*_x86_64.deb

*   In Linux, grant the logged in user the ability to talk to the development
    hardware via the linux tty device (/dev/ttyACMx) by adding them to the
    dialout group.

                    $ sudo usermod -a -G dialout ${USER}

Once the above is complete, log output can be viewed using the JLinkExe tool in
combination with JLinkRTTClient as follows:

-   Run the JLinkExe tool with arguments to autoconnect to the WSTK board:

    For MG12 use:

                    $ JLinkExe -device EFR32MG12PXXXF1024 -if JTAG -speed 4000 -autoconnect 1

    For MG21 use:

                    $ JLinkExe -device EFR32MG21AXXXF1024 -if SWD -speed 4000 -autoconnect 1

-   In a second terminal, run the JLinkRTTClient to view logs:

                    $ JLinkRTTClient

### Console Log

If the binary was built with this option or if you're using the Siwx917 WiFi
SoC, the logs and the CLI (if enabled) will be available on the serial console.

This console required a baudrate of **115200** with CTS/RTS. This is the default
configuration of Silicon Labs dev kits.

**HOWEVER** the console will required a baudrate of **921600** with CTS/RTS if
the verbose mode is selected (--verbose)

#### Configuring the VCOM

-   Using (Simplicity
    Studio)[https://community.silabs.com/s/article/wstk-virtual-com-port-baudrate-setting?language=en_US]
-   Using commander-cli
    ```
    commander vcom config --baudrate 921600 --handshake rtscts
    ```

### Using the console

With any serial terminal application such as screen, putty, minicom etc.

## Running the Complete Example

-   It is assumed here that you already have an OpenThread border router
    configured and running. If not see the following guide
    [Openthread_border_router](https://github.com/project-chip/connectedhomeip/blob/master/docs/guides/openthread_border_router_pi.md)
    for more information on how to setup a border router on a raspberryPi.

    Take note that the RCP code is available directly through
    [Simplicity Studio 5](https://www.silabs.com/products/development-tools/software/simplicity-studio/simplicity-studio-5)
    under File->New->Project Wizard->Examples->Thread : ot-rcp

-   User interface : **LCD** The LCD on Silabs WSTK shows a QR Code. This QR
    Code is be scanned by the CHIP Tool app For the Rendez-vous procedure over
    BLE

                  * On devices that do not have or support the LCD Display like the BRD4166A Thunderboard Sense 2,
                    a URL can be found in the RTT logs.

                    <info  > [SVR] Copy/paste the below URL in a browser to see the QR Code:
                    <info  > [SVR] https://project-chip.github.io/connectedhomeip/qrcode.html?data=CH%3AI34NM%20-00%200C9SS0

    **LED 0** shows the overall state of the device and its connectivity. The
    following states are possible:

                  -   _Short Flash On (50 ms on/950 ms off)_ ; The device is in the
                      unprovisioned (unpaired) state and is waiting for a commissioning
                      application to connect.

                  -   _Rapid Even Flashing_ ; (100 ms on/100 ms off)_ &mdash; The device is in the
                      unprovisioned state and a commissioning application is connected through
                      Bluetooth LE.

                  -   _Short Flash Off_ ; (950ms on/50ms off)_ &mdash; The device is fully
                      provisioned, but does not yet have full Thread network or service
                      connectivity.

                  -   _Solid On_ ; The device is fully provisioned and has full Thread
                      network and service connectivity.

    **Push Button 0**

                  -   _Press and Release_ : Start, or restart, BLE advertisement in fast mode. It will advertise in this mode
                      for 30 seconds. The device will then switch to a slower interval advertisement.
                      After 15 minutes, the advertisement stops.
                      Additionally, it will cycle through the QR code, application status screen and device status screen, respectively.

                  -   _Pressed and hold for 6 s_ : Initiates the factory reset of the device.
                      Releasing the button within the 6-second window cancels the factory reset
                      procedure. **LEDs** blink in unison when the factory reset procedure is
                      initiated.

*   You can provision and control the Chip device using the python controller,
    Chip tool standalone, Android or iOS app

*   You can provision and control the Chip device using the python controller,
    Chip tool standalone, Android or iOS app

    [CHIPTool](https://github.com/project-chip/connectedhomeip/blob/master/examples/chip-tool/README.md)

    Here is an example with the chip-tool:

                    $ chip-tool pairing ble-thread 1 hex:<operationalDataset> 20202021 3840

### Notes

-   Depending on your network settings your router might not provide native ipv6
    addresses to your devices (Border router / PC). If this is the case, you
    need to add a static ipv6 addresses on both device and then an ipv6 route to
    the border router on your PC

    -   On Border Router: `sudo ip addr add dev <Network interface> 2002::2/64`

    -   On PC(Linux): `sudo ip addr add dev <Network interface> 2002::1/64`

    -   Add Ipv6 route on PC(Linux)
        `sudo ip route add <Thread global ipv6 prefix>/64 via 2002::2`

## Running RPC console

-   As part of building the example with RPCs enabled the chip_rpc python
    interactive console is installed into your venv. The python wheel files are
    also created in the output folder: out/debug/chip_rpc_console_wheels. To
    install the wheel files without rebuilding:
    `pip3 install out/debug/chip_rpc_console_wheels/*.whl`

-   To use the chip-rpc console after it has been installed run:
    `chip-console --device /dev/tty.<SERIALDEVICE> -b 115200 -o /<YourFolder>/pw_log.out`

-   Then you can simulate a button press or release using the following command
    where : idx = 0 or 1 for Button PB0 or PB1 action = 0 for PRESSED, 1 for
    RELEASE Test toggling the LED with
    `rpcs.chip.rpc.Button.Event(idx=1, pushed=True)`

## Device Tracing

Device tracing is available to analyze the device performance. To turn on
tracing, build with RPC enabled. See Build the example with pigweed RPC.

Obtain tracing json file.

    $ ./{PIGWEED_REPO}/pw_trace_tokenized/py/pw_trace_tokenized/get_trace.py -d {PORT} -o {OUTPUT_FILE} \
    -t {ELF_FILE} {PIGWEED_REPO}/pw_trace_tokenized/pw_trace_protos/trace_rpc.proto

## Memory settings

While most of the RAM usage in CHIP is static, allowing easier debugging and
optimization with symbols analysis, we still need some HEAP for the crypto and
OpenThread. Size of the HEAP can be modified by changing the value of the
`configTOTAL_HEAP_SIZE` define inside of the FreeRTOSConfig.h file of this
example. Please take note that a HEAP size smaller than 13k can and will cause a
Mbedtls failure during the BLE rendez-vous or CASE session

To track memory usage you can set `enable_heap_monitoring = true` either in the
BUILD.gn file or pass it as a build argument to gn. This will print on the RTT
console the RAM usage of each individual task and the number of Memory
allocation and Free. While this is not extensive monitoring you're welcome to
modify `examples/platform/silabs/MemMonitoring.cpp` to add your own memory
tracking code inside the `trackAlloc` and `trackFree` function

## OTA Software Update

For the description of Software Update process with EFR32 example applications
see
[EFR32 OTA Software Update](../../../docs/platforms/silabs/silabs_efr32_software_update.md)

## Group Communication (Multicast)

With this EVSE example you can also use group communication to send EVSE
commands to multiples devices at once. Please refer to the
[chip-tool documentation](../../chip-tool/README.md) _Configuring the server
side for Group Commands_ and _Using the Client to Send Group (Multicast) Matter
Commands_

## Building options

All of Silabs's examples within the Matter repo have all the features enabled by
default, as to provide the best end user experience. However some of those
features can easily be toggled on or off. Here is a short list of options to be
passed to the build scripts.

### Disabling logging

`chip_progress_logging, chip_detail_logging, chip_automation_logging`

    $ ./scripts/examples/gn_silabs_example.sh ./examples/evse-app/silabs ./out/evse-app BRD4164A "chip_detail_logging=false chip_automation_logging=false chip_progress_logging=false"

### Debug build / release build

`is_debug`

    $ ./scripts/examples/gn_silabs_example.sh ./examples/evse-app/silabs ./out/evse-app BRD4164A "is_debug=false"

### Disabling LCD

`show_qr_code`

    $ ./scripts/examples/gn_silabs_example.sh ./examples/evse-app/silabs ./out/evse-app BRD4164A "show_qr_code=false"

### KVS maximum entry count

`kvs_max_entries`

    Set the maximum Kvs entries that can be stored in NVM (Default 75)
    Thresholds: 30 <= kvs_max_entries <= 255

    $ ./scripts/examples/gn_silabs_example.sh ./examples/evse-app/silabs ./out/evse-app BRD4164A kvs_max_entries=50