Trait Pollable 

pub trait Pollable {
    // Required method
    fn poll(&self) -> Poll<Result<Option<Vec<u8>>, String>>;
}

A handle for a long-running operation that can be polled for completion.

This is used primarily by the INVOK operation. Since PK Command is designed for poll-based environments (like in embedded systems, or within an async runtime), methods that take time to execute should return a Pollable.

The state machine will call poll() periodically and send AWAIT packets to the host to keep the transaction alive as long as Poll::Pending is returned.

Required Methods

fn poll(&self) -> Poll<Result<Option<Vec<u8>>, String>>

Polls the operation for completion.

Returns

• Poll::Ready(Ok(Some(data))): Operation finished with result data.
• Poll::Ready(Ok(None)): Operation finished successfully with no data.
• Poll::Ready(Err(e)): Operation failed with an error message.
• Poll::Pending: Operation is still in progress.

Implementors

impl Pollable for EmbassyPollable

Available on crate feature embassy-runtime only.

impl Pollable for SmolFuturePollable

Available on crate features std and smol-runtime only.

impl Pollable for PkPromise

Available on crate feature std only.

impl Pollable for TokioFuturePollable

Available on crate features std and tokio-runtime only.