Function list_folder 

pub async fn list_folder<T: AsyncRead + AsyncWrite + Unpin>(
    client: &mut MapClient<T>,
    folder: Folder,
    template: &ListMessagesFilter,
) -> Result<Vec<MessageEntry>>

Lists folder, paging at 1024 entries per request and accumulating across pages.

template carries any device-side filter (currently just read_status) applied to every page; its max_count/offset are ignored — this function owns pagination. Listing only — no bodies are fetched, so this is cheap relative to fetch_folder and is what the live threads aggregation uses. Pure device read: no store access. Returns entries in device listing order.

Errors

Returns an error if any MAP set_folder/list_messages operation fails.