Respond to bp reqs

src/gdbstub.rs

@@ -275,6 +275,7 @@ pub fn run(log: slog::Logger, chip: &mut chip::Chip) {
             } else {
                 breakpoints.insert(bp_addr);
             }
+            response = "OK".as_bytes().to_vec();
 
         } else if pkg.raw_data[0] == b'v' {
             let word = std::str::from_utf8(&pkg.raw_data[1..]).unwrap();