Struct ServiceClientCallback 

pub struct ServiceClientCallback<Svc: RosService, const REQ_BUF: usize = { crate::config::DEFAULT_RX_BUF_SIZE }, const REPLY_BUF: usize = { crate::config::DEFAULT_RX_BUF_SIZE }> { /* private fields */ }

Send handle for a callback-based typed service client.

Returned by create_client_with_callback: the reply is delivered to the registered closure at spin_once (no Promise poll). This handle only sends — it holds a *mut to the arena entry’s ServiceClientSendHeader (pinned in the executor arena, like a guard-condition flag), so a single outstanding request is gated by hdr.pending.

Safety / lifetime

Valid only while the owning executor lives (the arena backs the header). Do not use after the executor is dropped.

Implementations

impl<Svc: RosService, const REQ_BUF: usize, const REPLY_BUF: usize> ServiceClientCallback<Svc, REQ_BUF, REPLY_BUF>

pub fn call(&mut self, request: &Svc::Request) -> Result<(), NodeError>

Send a typed request. The reply is delivered to the registered callback at a later spin_once. Returns RequestInFlight if a prior request has not yet been answered (single outstanding request).