RE: csl

Marte Myrvold — Wed, 01 Jul 2026 11:37:18 GMT

Hi,

You can enable CSL with the following Kconfig option:

CONFIG_OPENTHREAD_CSL_RECEIVER=y

You can then configure the CSL behavior with these options:

CONFIG_OPENTHREAD_CSL_RECEIVER - Enables SSED child mode.
CONFIG_OPENTHREAD_CSL_AUTO_SYNC - Enables the CSL autosynchronization feature.
CONFIG_OPENTHREAD_CSL_TIMEOUT - Sets the default CSL timeout in seconds.
CONFIG_OPENTHREAD_CSL_RECEIVE_TIME_AHEAD - Sets the CSL receiver wake up margin in microseconds.
CONFIG_OPENTHREAD_MIN_RECEIVE_ON_AHEAD - Sets the minimum receiving time before start of MAC header.
CONFIG_OPENTHREAD_MIN_RECEIVE_ON_AFTER - Sets the minimum receiving time after start of MAC header.
CONFIG_OPENTHREAD_PLATFORM_CSL_UNCERT - Sets the fixed uncertainty of the device for scheduling CSL Transmissions in units of 10 microseconds.

You can read more in our documentation here: Synchronized Sleepy End Device.

Best regards,
Marte