CHIP Linux Lighting Example

An example showing the use of CHIP on the Linux. The document will describe how to build and run CHIP Linux Lighting Example on Raspberry Pi. This doc is tested on Ubuntu for Raspberry Pi Server 20.04 LTS (aarch64) and Ubuntu for Raspberry Pi Desktop 20.10 (aarch64)

To cross-compile this example on x64 host and run on NXP i.MX 8M Mini EVK, see the associated README document for details.

CHIP Linux Lighting Example

Building

Install tool chain

  $ sudo apt-get install git gcc g++ python pkg-config libssl-dev libdbus-1-dev libglib2.0-dev ninja-build python3-venv python3-dev unzip

Build the example application:

  $ cd ~/connectedhomeip/examples/lighting-app/linux
  $ git submodule update --init
  $ source third_party/connectedhomeip/scripts/activate.sh
  $ gn gen out/debug
  $ ninja -C out/debug

To delete generated executable, libraries and object files use:

  $ cd ~/connectedhomeip/examples/lighting-app/linux
  $ rm -rf out/

Build the example with pigweed RPC

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

Commandline arguments

--wifi

Enables WiFi management feature. Required for WiFi commissioning.
--thread

Enables Thread management feature, requires ot-br-posix dbus daemon running. Required for Thread commissioning.
--ble-device <interface id>

Use specific bluetooth interface for BLE advertisement and connections.

interface id: the number after hci when listing BLE interfaces by hciconfig command, for example, --ble-device 1 means using hci1 interface. Default: 0.

Running the Complete Example on Raspberry Pi 4

If you want to test Echo protocol, please enable Echo handler
gn gen out/debug --args='chip_app_use_echo=true'
ninja -C out/debug

Prerequisites
1. A Raspberry Pi 4 board
2. A USB Bluetooth Dongle, Ubuntu desktop will send Bluetooth advertisement, which will block CHIP from connecting via BLE. On Ubuntu server, you need to install pi-bluetooth via APT.
3. Ubuntu 20.04 or newer image for ARM64 platform.
Building

Follow Building section of this document.

Running

[Optional] Plug USB Bluetooth dongle

Plug USB Bluetooth dongle and find its bluetooth device number. The number after hci is the bluetooth device number, 1 in this example.

  $ hciconfig
  hci1: Type: Primary  Bus: USB
      BD Address: 00:1A:7D:AA:BB:CC  ACL MTU: 310:10  SCO MTU: 64:8
      UP RUNNING PSCAN ISCAN
      RX bytes:20942 acl:1023 sco:0 events:1140 errors:0
      TX bytes:16559 acl:1011 sco:0 commands:121 errors:0

  hci0: Type: Primary  Bus: UART
      BD Address: B8:27:EB:AA:BB:CC  ACL MTU: 1021:8  SCO MTU: 64:1
      UP RUNNING PSCAN ISCAN
      RX bytes:8609495 acl:14 sco:0 events:217484 errors:0
      TX bytes:92185 acl:20 sco:0 commands:5259 errors:0

Run Linux Lighting Example App

  $ cd ~/connectedhomeip/examples/lighting-app/linux
  $ sudo out/debug/chip-lighting-app --ble-device [bluetooth device number]
  # In this example, the device we want to use is hci1
  $ sudo out/debug/chip-lighting-app --ble-device 1

Test the device using ChipDeviceController on your laptop / workstation etc.

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 -s localhost:33000 -o /<YourFolder>/pw_log.out
Then you can Get and Set the light using the RPCs: rpcs.chip.rpc.Lighting.Get()

rpcs.chip.rpc.Lighting.Set(on=True, level=128, color=protos.chip.rpc.LightingColor(hue=5, saturation=5))

Device Tracing

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

Obtain tracing json file.

    $ ./{PIGWEED_REPO}/pw_trace_tokenized/py/pw_trace_tokenized/get_trace.py -s localhost:33000 \
     -o {OUTPUT_FILE} -t {ELF_FILE} {PIGWEED_REPO}/pw_trace_tokenized/pw_trace_protos/trace_rpc.proto

Trigger event using lighting-app event named pipe

You can send a command to lighting-app to trigger specific event via lighting-app event named pipe /tmp/chip_lighting_fifo-.

Trigger `SoftwareFault` events

Generate event SoftwareFault when a software fault takes place on the Node.
```
$ echo '{"Name":"SoftwareFault"}' > /tmp/chip_lighting_fifo-<PID>
```

Trigger `HardwareFault` events

Generate event HardwareFaultChange to indicate a change in the set of hardware faults currently detected by the Node.
```
$ echo '{"Name":"HardwareFaultChange"}' > /tmp/chip_lighting_fifo-<PID>
```
Generate event RadioFaultChange to indicate a change in the set of radio faults currently detected by the Node.
```
$ echo '{"Name":"RadioFaultChange"}' > /tmp/chip_lighting_fifo-<PID>
```
Generate event NetworkFaultChange to indicate a change in the set of network faults currently detected by the Node.
```
$ echo '{"Name":"NetworkFaultChange"}' > /tmp/chip_lighting_fifo-<PID>
```
Generate event BootReason to indicate the reason that caused the device to start-up, from the following set of BootReasons.

PowerOnReboot The Node has booted as the result of physical interaction with the device resulting in a reboot.
BrownOutReset The Node has rebooted as the result of a brown-out of the Node’s power supply.
SoftwareWatchdogReset The Node has rebooted as the result of a software watchdog timer.
HardwareWatchdogReset The Node has rebooted as the result of a hardware watchdog timer.
SoftwareUpdateCompleted The Node has rebooted as the result of a completed software update.
SoftwareReset The Node has rebooted as the result of a software initiated reboot.
```
$ echo '{"Name":"<BootReason>"}' > /tmp/chip_lighting_fifo-<PID>
```

Trigger Switch events

Generate event SwitchLatched, when the latching switch is moved to a new position.

$ echo '{"Name":"SwitchLatched","NewPosition":3}' > /tmp/chip_lighting_fifo-<PID>

Generate event InitialPress, when the momentary switch starts to be pressed.

$ echo '{"Name":"InitialPress","NewPosition":3}' > /tmp/chip_lighting_fifo-<PID>

Generate event LongPress, when the momentary switch has been pressed for a "long" time.
```
$ echo '{"Name":"LongPress","NewPosition":3}' > /tmp/chip_lighting_fifo-<PID>
```

Generate event ShortRelease, when the momentary switch has been released.

$ echo '{"Name":"ShortRelease","PreviousPosition":3}' > /tmp/chip_lighting_fifo-<PID>

Generate event LongRelease when the momentary switch has been released and after having been pressed for a long time.
```
$ echo '{"Name":"LongRelease","PreviousPosition":3}' > /tmp/chip_lighting_fifo-<PID>
```
Generate event MultiPressOngoing to indicate how many times the momentary switch has been pressed in a multi-press sequence, during that sequence.
```
$ echo '{"Name":"MultiPressOngoing","NewPosition":3,"CurrentNumberOfPressesCounted":4}' > /tmp/chip_lighting_fifo-<PID>
```
Generate event MultiPressComplete to indicate how many times the momentary switch has been pressed in a multi-press sequence, after it has been detected that the sequence has ended.
```
$ echo '{"Name":"MultiPressComplete","PreviousPosition":3,"TotalNumberOfPressesCounted":2}' > /tmp/chip_lighting_fifo-<PID>
```

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