Fix MIDI bridge: remove semicolons (corrupts Pd velocity parsing), retry on device busy

scripts/midi-bridge.py

@@ -46,8 +46,8 @@ def _find_midi_dev():
 
 def midi_msg(status, data1, data2=None):
     if data2 is not None:
-        return f"midi {status} {data1} {data2};"
-    return f"midi {status} {data1};"
+        return f"midi {status} {data1} {data2}"
+    return f"midi {status} {data1}"
 
 
 def _open_midi():
@@ -55,7 +55,15 @@ def _open_midi():
     while not os.path.exists(midi_dev):
         time.sleep(0.5)
         midi_dev = _find_midi_dev()
-    fd = os.open(midi_dev, os.O_RDWR | os.O_NONBLOCK)
+    while True:
+        try:
+            fd = os.open(midi_dev, os.O_RDWR | os.O_NONBLOCK)
+            break
+        except OSError as e:
+            if e.errno == 16:
+                time.sleep(0.5)
+                continue
+            raise
     os.set_blocking(fd, False)
     return fd