flatbuffer base

flatbuffers/control/lost.fbs

@@ -0,0 +1,19 @@
+namespace hmmmm.ctrl.lost;
+
+// Client → Server: request buffered (undelivered) messages for a seat.
+table LostMessagesRequest {
+    seat_id: uint64;
+    clear:   bool = false;   // if true, drop the buffer after reading
+}
+
+// One buffered message that was not delivered before the seat disconnected.
+table LostMessage {
+    original_nonce: uint64;
+    data: [ubyte];           // raw FlatBuffer bytes of the original ServerMessage
+}
+
+// Server → Client: buffered messages for the requested seat.
+table LostMessagesResponse {
+    seat_id:  uint64;
+    messages: [LostMessage];
+}