Type Alias DeviceNodeMacArena 

pub type DeviceNodeMacArena<CS> = MaybeUninit<AsyncRefCell<DeviceNodeMac<CS>>>;

The uninitialized arena a board declares for its MAC. Board-side because its type depends on CS, and a static cannot be generic. A MaybeUninit rather than a StaticCell so a board may place it in a NOLOAD region the runtime never zeroes (the Heltec V2 puts it in the classic ESP32’s dram2_seg, where a StaticCell’s flag byte would come up as garbage); bring_up’s at-most-once contract is what the cell’s flag used to enforce.

Aliased Type

pub union DeviceNodeMacArena<CS> {
    /* private fields */
}