Function recv_select_publish_batch 

pub fn recv_select_publish_batch<Tx>(
    rxs: &mut [&mut dyn LaneRx],
    rr: &mut usize,
    tx: &mut Tx,
    buf: &mut [u8],
    on_full: OnFullV1,
    wait: &mut impl WaitStrategy,
    batch: usize,
) -> Result<bool, LaneTxError>
where
    Tx: LaneTx,

Receive from one of N RX lanes (round-robin) → publish, up to batch messages.

Returns Ok(true) if at least one message was processed.