CHIP Linux Air Purifier Example

An example showing the use of CHIP on the Linux. The document will describe how to build and run CHIP Air Purifier Example on A Linux System. This doc is tested on Ubuntu 20.04 LTS.

The Air Purifier is a composed device with Endpoint 1 being the Air Purifier. Endpoint 2 is an Air Quality Sensor, Endpoint 3 is a Relative Humidity Sensor and endpoint 4 is a Temperature Sensor.

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 Air Purifier Example
  • Building
  • Commandline arguments
  • Running the Complete Example on Raspberry Pi 4

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/air-purifier-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/air-purifier-app/linux/
    $ rm -rf out/
  

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 ChipTool on your laptop / workstation etc.