Matter All-Devices Application — Silabs (EFR32)#

This is the Silabs/EFR32 target for the all-devices-app. Refer to the top-level all-devices-app README for a description of the Code-Driven paradigm, supported device types, CLI concepts, and the overall documentation suite under ../docs/.

Unlike the Linux/POSIX variant, the Silabs image cannot select device types from argv at boot. Instead the topology is chosen in one of two ways:

Runtime (Matter shell) — flash the default image and use the devtype shell command to store a single device type in KVS. The image will instantiate that device on the next boot.
Build time (no shell required) — bake a fixed, ordered list of device types into the image via GN args. This is the recommended flow for product-like builds and enables running multiple device types on consecutive endpoints without any Matter-shell interaction.

The build-time selection is driven by two GN args declared in all-devices-common/device-factory/enabled_devices.gni:

all_devices_enabled_devices — subset of device types compiled into the DeviceFactory. Empty (default) compiles all of them in.
all_devices_default_devices — ordered list of device types instantiated at boot, one per endpoint starting at endpoint 1. Empty (default) means “fall back to the runtime KVS override / factory default single device”.

Every entry in all_devices_default_devices must also be present in all_devices_enabled_devices (unless the enabled list is empty). GN enforces this at gen time.

Build command (humidity + temperature sensor on BRD4187C)#

./scripts/examples/gn_silabs_example.sh \
    examples/all-devices-app/silabs \
    out/all-devices-app \
    BRD4187C \
    'all_devices_enabled_devices=["humidity-sensor","temperature-sensor"]' \
    'all_devices_default_devices=["humidity-sensor","temperature-sensor"]' \
    'all_devices_app_name="humidity-and-temp-sensor"' \
    'chip_build_libshell=false'

Result:

Output image: out/all-devices-app/thread/BRD4187C/humidity-and-temp-sensor.out

Endpoint layout on boot:

Endpoint 0 → Root Node
Endpoint 1 → humidity-sensor
Endpoint 2 → temperature-sensor

No Matter shell interaction is needed to select the device types — the mapping is fixed at build time. Dropping chip_build_libshell=false keeps the devtype shell command available but has no effect on the pre-baked topology (the build-time list takes precedence over any KVS override).

Building a single device type#

Same recipe with a single-element list, e.g. a temperature sensor only:

./scripts/examples/gn_silabs_example.sh \
    examples/all-devices-app/silabs \
    out/all-devices-app \
    BRD4187C \
    'all_devices_enabled_devices=["temperature-sensor"]' \
    'all_devices_default_devices=["temperature-sensor"]' \
    'all_devices_app_name="temperature-sensor-app"' \
    'chip_build_libshell=false'

Default image (runtime device selection)#

Omitting both args produces the full matter-silabs-all-devices-example.out image with every device type registered in the factory and runtime selection via the shell:

./scripts/examples/gn_silabs_example.sh \
    examples/all-devices-app/silabs \
    out/all-devices-app \
    BRD4187C

Then, from the device shell:

matterCli> devtype list
matterCli> devtype set humidity-sensor
matterCli> reboot

Low-power build (ICD, MTD, no shell/LEDs)#

To reproduce a low-power / battery-operated sample-app configuration, add the --low-power flag (LCD and shell), select the power-source device type in addition to the sensor(s) you want on the endpoint topology, enable the ICD server, and switch the OpenThread stack to MTD:

./scripts/examples/gn_silabs_example.sh \
    examples/all-devices-app/silabs \
    out/temp_sensor/ \
    BRD2601B \
    --low-power \
    'all_devices_enabled_devices=["humidity-sensor","temperature-sensor","power-source"]' \
    'all_devices_default_devices=["humidity-sensor","temperature-sensor"]' \
    'all_devices_app_name="TempSensor"' \
    'sl_enable_si70xx_sensor=true' \
    'chip_enable_icd_server=true' \
    'chip_openthread_ftd=false'

Notes:

all_devices_default_devices intentionally omits power-source; the app auto-appends a power-source endpoint when chip_enable_icd_server=true (see maybeAddPowerSource() in src/AppTask.cpp) so commissioners can display a battery level / battery voltage.
sl_enable_si70xx_sensor=true wires the on-board Si7021 sensor of the BRD2601B to feed the humidity- and temperature-sensor endpoints.

Expected power consumption#

Once commissioned, in ICD Idle Mode (i.e. between polls), current draw on the BRD2601B should easily reach ~4 µA. If you observe a significantly higher baseline or short periodic wake-ups on the power scope, double-check that --low-power, chip_enable_icd_server=true and chip_openthread_ftd=false all made it into the build.

Matter All-Devices Application — Silabs (EFR32)

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