Module command_client 

Client for sending IPC commands to external modules via WebSocket. Client for sending IPC commands to external modules via WebSocket.

CommandClient allows control programs to send CommandMessage requests (e.g., labelit.translate_check) to any external module through the existing WebSocket connection and poll for responses non-blockingly from process_tick.

Multi-consumer pattern

The framework passes a &mut CommandClient to the control program each cycle via TickContext. The framework calls poll() before process_tick, so incoming responses are already buffered. Each subsystem sends requests via send() and retrieves its own responses by transaction ID via take_response().

fn process_tick(&mut self, ctx: &mut TickContext<Self::Memory>) {
    // poll() is already called by the framework before process_tick

    // Each subsystem checks for its own responses by transaction_id
    self.labelit.tick(ctx.client);
    self.other_camera.tick(ctx.client);

    // Clean up stale requests
    ctx.client.drain_stale(Duration::from_secs(10));
}

Structs

CommandClient

A non-blocking client for sending IPC commands to external modules.