Detect blockwise complete in stream iteration

examples/xbd-net/src/lib.rs

@@ -143,31 +143,19 @@ async fn xbd_main() {
 
             println!("!! sending ... [blockwise-1]");
             let mut bs = Xbd::async_gcoap_get_blockwise(addr_self, "/const/song.txt");
-            let mut _debug = 0;
-            while let Some(req) = bs.next().await {
+            while let Some(Some(req)) = bs.next().await {
                 println!("req: {:?}", req);
 
-                println!("!!!! before `let out = req.await`");
-                let out = req.unwrap().await; // !!!!
+                let out = req.await;
                 println!("@@ out: {:?}", out);
-
-                //break; // !!!! TODO check whether end block
-                //====
-                _debug += 1;
-//                if _debug > 1 { break; } // return on 2nd packet
-                //====
-                // if let xbd::GcoapMemoState::Resp(Some(payload)) = out {
-                //     if payload.len() == 23 { break; } // !!!
-                // }
-                //====
             }
             panic!("ok"); // !!!!
 
             println!("!! sending ... [blockwise-2]");
             // WIP multiple-static blockwise streams !!
             let mut bs = Xbd::async_gcoap_get_blockwise(addr_self, "/const/song.txt");
-            while let Some(req) = bs.next().await {
-                let out = req.unwrap().await; // !!!!
+            while let Some(Some(req)) = bs.next().await {
+                let out = req.await;
                 println!("@@ out: {:?}", out);
                 panic!("!!");
             }