SPINEL_PROP_MCU_POWER_STATE value

NCP's MCU Power State Format: 'C` Required capability: CAP_MCU_POWER_SAVE This property specifies the desired power state of NCP's micro-controller (MCU) when the underlying platform's operating system enters idle mode (i.e., all active tasks/events are processed and the MCU can potentially enter a energy-saving power state). The power state primarily determines how the host should interact with the NCP and whether the host needs an external trigger (a "poke") to NCP before it can communicate with the NCP or not. After a reset, the MCU power state MUST be SPINEL_MCU_POWER_STATE_ON. Enumeration `spinel_mcu_power_state_t` defines the valid values (`SPINEL_MCU_POWER_STATE_*` constants): `SPINEL_MCU_POWER_STATE_ON`: NCP's MCU stays on and active all the time. When the NCP's desired power state is set to this value, host can send messages to NCP without requiring any "poke" or external triggers. MCU is expected to stay on and active. Note that the `ON` power state only determines the MCU's power mode and is not related to radio's state. `SPINEL_MCU_POWER_STATE_LOW_POWER`: NCP's MCU can enter low-power (energy-saving) state. When the NCP's desired power state is set to `LOW_POWER`, host is expected to "poke" the NCP (e.g., an external trigger like an interrupt) before it can communicate with the NCP (send a message to the NCP). The "poke" mechanism is determined by the platform code (based on NCP's interface to the host). While power state is set to `LOW_POWER`, NCP can still (at any time) send messages to host. Note that receiving a message from the NCP does NOT indicate that the NCP's power state has changed, i.e., host is expected to continue to "poke" NCP when it wants to talk to the NCP until the power state is explicitly changed (by setting this property to `ON`). Note that the `LOW_POWER` power state only determines the MCU's power mode and is not related to radio's state. `SPINEL_MCU_POWER_STATE_OFF`: NCP is fully powered off. An NCP hardware reset (via a RESET pin) is required to bring the NCP back to `SPINEL_MCU_POWER_STATE_ON`. RAM is not retained after reset.