feat: add Stop() to power down Wi-Fi driver - #63
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Expose esp_wifi_stop() as espradio.Stop() to save power when the network is occasionally used. On an M5Stack Fire, stopping the radio drops system current by ~50 mA. API Note: Stop() does not undo Enable(). Init-time state (ISR registration, scheduler ticker) remains. The caller must re-establish association and DHCP after a subsequent Start(). Implementation details: - Stop() blocks until the blob posts the WIFI_EVENT_STA_STOP event or a 15-second timeout expires, mirroring the Connect() behavior.
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Summary
Adds
espradio.Stop()to stop the Wi-Fi interface (callsesp_wifi_stop()).Enable(). Init-time state (ISR registration, scheduler ticker, etc.) remains. The caller must re-establish association and DHCP after a subsequentStart().Motivation
To save power for applications that only need the network occasionally.
On an M5Stack Fire (ESP32), adding
Stop()between sync cycles dropped system current by ~50 mA (0.21 A -> 0.16 A).Implementation details
esp_wifi_stopis already in the vendored headers.Stop()blocks until theWIFI_EVENT_STA_STOPevent is received (with a 15-second timeout), mirroring the synchronization pattern used inConnect().Testing & Notes
Connect-> DHCP -> DNS -> NTP ->Stop->Start.wifi: nan is nullis emitted by ESP-IDF during stop. This is harmless.nmonly).