# Matter Arm Mbed OS Pigweed Example Application
The Arm Mbed OS Pigweed Example demonstrates the usage of Pigweed module
functionalities in an application.
You can use this example as a reference for creating your own application.
The example is based on
[Matter](https://github.com/project-chip/connectedhomeip) and Arm Mbed OS, and
supports remote access and control of device over a serial port.
Pigweed functionalities are integrated into this application. The Remote
Procedure Call (RPC) server is created. It allows sending commands through the
serial port to the device. The following RPC protocols services are available:
- **Echo** - receive message and send the same payload back
- [Overview](#overview)
- [Run application](#run-application)
- [Environment setup](#environment-setup)
- [Building](#building)
- [Flashing](#flashing)
- [Debugging](#debugging)
- [Testing](#testing)
- [Serial port terminal](#serial-port-terminal)
- [RPC console](#rpc-console)
- [Supported devices](#supported-devices)
- [Notes](#notes)
- [Device UI](#device-ui)
- [Notes](#notes-1)
## Overview
Pigweed libraries are built and organized in a way that enables faster and more
reliable development. In the Matter project, the Pigweed module is planned to be
used to create system infrastructures, for example for performing on-device
tests, but considering its general functionalities, it can be useful also in
other cases.
## Run application
### Environment setup
Before building the example, check out the Matter repository and sync submodules
using the following command:
$ git submodule update --init
Building the example application requires the use of **ARM Mbed-OS** sources and
the **arm-none-gnu-eabi** toolchain.
The Cypress OpenOCD package is required for flashing purpose. Install the
Cypress OpenOCD and set env var `OPENOCD_PATH` before calling the flashing
script.
```
cd ~
wget https://github.com/Infineon/openocd/releases/download/release-v4.3.0/openocd-4.3.0.1746-linux.tar.gz
tar xzvf openocd-4.3.0.1746-linux.tar.gz
export OPENOCD_PATH=$HOME/openocd
```
Some additional packages may be needed, depending on selected build target and
its requirements.
> **The VSCode devcontainer has these components pre-installed. Using the VSCode
> devcontainer is the recommended way to interact with Arm Mbed-OS port of the
> Matter Project.**
>
> **Please read this [README.md](../../..//docs/VSCODE_DEVELOPMENT.md) for more
> information about using VSCode in container.**
To initialize the development environment, download all registered sub-modules
and activate the environment:
```
$ source ./scripts/bootstrap.sh
$ source ./scripts/activate.sh
```
If packages are already installed then you just need to activate the development
environment:
```
$ source ./scripts/activate.sh
```
### Building
The Pigweed application can be built in the same way as any other Matter example
ported to the mbed-os platform.
- **by using generic vscode task**:
```
Command Palette (F1) => Run Task... => Run Mbed Application => build => pigweed-app => (board name) => (build profile) => (build type)
```
- **by calling explicitly building script:**
```
${MATTER_ROOT}/scripts/examples/mbed_example.sh -c=build -a=pigweed-app -b= -p= -T=
```
Both approaches are limited to supported evaluation boards which are listed in
[Supported devices](#supported-devices) paragraph.
Mbed OS defines three building profiles: _develop, debug_ and _release_. For
more details please visit
[ARM Mbed OS build profiles](https://os.mbed.com/docs/mbed-os/latest/program-setup/build-profiles-and-rules.html).
There are also three types of built application: _simple, boot_ and _upgrade_:
- **simple** - standalone application, mainly for developing and testing
purpose (all building profiles are supported)
- **boot** - signed application + bootloader, it supports booting process and
can be use for firmware update (only _release_ building profiles is
supported)
- **update** - signed application, application image can be used for firmware
update (only _release_ building profiles is supported)
When using the building script, it is possible expand the list of acceptable
targets; this may be useful for rapid testing of a new mbed-targets.
### Flashing
The Pigweed application can be flashed in the same way as any other Matter
example ported to mbed-os platform.
The [Open On-Chip Debugger](http://openocd.org/) is used to upload a binary
image and reset the device.
- **by using VSCode task**:
```
Command Palette (F1) => Run Task... -> Run Mbed Application => flash => pigweed-app => (board name) => (build profile)
```
- **by calling explicitly building script:**
```
${MATTER_ROOT}/scripts/examples/mbed_example.sh -c=flash -a=pigweed-app -b= -p=
```
- **by using VSCode launch task**:
```
Run and Debug (Ctrl+Shift+D) => Flash Mbed examples => Start Debugging (F5) => (board name) => pigweed-app => (build profile)
```
The last option uses the Open On-Chip Debugger to open and manage the gdb-server
session. Then gdb-client (arm-none-eabi-gdb) upload binary image and reset
device.
It is possible to connect to an external gdb-server session by using specific
**'Flash Mbed examples [remote]'** task.
### Debugging
Debugging can be performed in the same was as with any other Matter example
ported to mbed-os platform.
The [Open On-Chip Debugger](http://openocd.org/) is used to to open and manage
the gdb-server session. Then gdb-client (arm-none-eabi-gdb) connect the server
to upload binary image and control debugging.
```
Run and Debug (Ctrl+Shift+D) => Debug Mbed examples => Start Debugging (F5) => (board name) => pigweed-app => (build profile)
```
It is possible to connect to an external gdb-server session by using specific
**'Debug Mbed examples [remote]'** task.
### Testing
#### Serial port terminal
The application traces are streaming to serial output. To start communication
open a terminal session and connect to the serial port of the device. You can
use **mbed-tools** for this purpose
([mbed-tools](https://github.com/ARMmbed/mbed-tools)):
mbed-tools sterm -p /dev/ttyACM0 -b 115200 -e off
After device reset these lines should be visible:
[INFO][CHIP]: [-]Mbed pigweed-app example application start
...
[INFO][CHIP]: [-]Mbed pigweed-app example application run
The pigweed-app application launched correctly and you can follow traces in the
terminal.
#### RPC console
The RPC console is an interactive Python shell console, where the different RPC
command can be invoked. It is a complete solution for interacting with hardware
devices using pw_rpc over a pw_hdlc transport. For more details about Pigweed
modules visit [Pigweed modules](https://pigweed.dev/module_guides.html).
** Building and installing
**
To build and install the RPC console check the guide
[CHIP RPC console](../../common/pigweed/rpc_console/README.md).
** Run
**
To start the RPC console run the following command and provide device connection
parameters as arguments:
- --device/-d the serial port to use.
- --baudrate/-b the baud rate to use.
- --output/-o the file to which to write device output (HDLC channel 1),
provide - or omit for stdout.
- --socket-addr/-s alternatively use socket to connect to server, type default
for localhost:33000, or manually input the server address:port.
Example:
chip-console -d /dev/ttyUSB0 -b 115200 -o /tmp/pw_rpc.out
To send the echo message type the following command, where you define the
message content:
In [1]: rpcs.pw.rpc.EchoService.Echo(msg="Hello device")
The response from the device should be:
Out[1]: (Status.OK, pw.rpc.EchoMessage(msg="Hello device"))
For more details about RPC console and supported services visit
[CHIP RPC console](../../common/pigweed/rpc_console/README.md).
### Supported devices
The example supports building and running on the following mbed-enabled devices:
| Manufacturer | Hardware platform | Build target | Platform image | Status | Platform components |
| ----------------------------------------------------- | ------------------------------------------------------------------------- | --------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | :----: | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Cypress
Semiconductor](https://www.cypress.com/) | [CY8CPROTO-062-4343W](https://os.mbed.com/platforms/CY8CPROTO-062-4343W/) | `CY8CPROTO_062_4343W` | CY8CPROTO-062-4343W
LEDs
- Board has only one usable LED (LED4) which corresponds to USER LED from UI.
Buttons
Slider