Expand description
Radio bring-up for the ESP32/ESP32-S3 coprocessor.
The on-package radio is shared between BLE and WiFi — both are sub-functions of the same hardware. Each lives in its own submodule and is gated by a cargo feature, so a binary only compiles in (and pays the RAM cost of) the radios it actually uses:
| Feature | Module | Provides |
|---|---|---|
ble | ble | BleConnector for the trouble-host stack |
wifi | wifi | WiFi controller + scanning |
wifi-sta | wifi | STA + DHCP embassy_net::Stack (adds embassy-net) |
coex | — | software WiFi/BLE coexistence |
Coexistence (coex) lets BLE and WiFi run at the same time at the cost of
extra RAM (~96 KB reclaimed on ESP32, less on ESP32-S3). It is only compiled
in when an application enables the coex feature.
In all cases esp_rtos::start(..) must run before any radio is created — the
radio drivers schedule their work on the esp-rtos executor.