Constant MAX_RX_SPACE_BUFFERS

pub const MAX_RX_SPACE_BUFFERS: u32 = 2047; // 2_047u32

The maximum number of RxSpaceBuffer structs that could be sent in a single FIDL message while staying within the maximum message size enforced by the bindings.

At the time of writing, FIDL messages are limited to 65 KiB. In the current FIDL wire format, the maximum size of an RxSpaceBuffer is 32 bytes, and the fixed overhead of the QueueRxSpace request is 32 bytes (16 for the FIDL message header + 16 for the vector), so we selected the maximum N where 32 + N * 32 <= 65 KiB.