8.14.4 BT_FW_CHIP_ALLOW_SLEEP

The following command specifies that the at_pwr_dev module does not require the chip to be awake. The user must use this command after downloading and starting the BT firmware using UART, allowing the BT and Wi-Fi firmwares to take sleep or wake decisions.
$ echo BT_FW_CHIP_ALLOW_SLEEP > /dev/wilc_bt