I am not the OP but I am having an issue sending CC messages using the adafruit blemidi library. I was able to successfully send a CC signal, but it is hit and miss. If I print my Cc value to the serial monitor, I can see that it is changing, so the hardware setup seems to be fine, but it only occasionally sends the signal (testing by controlling loopcommunity PRIME via midimittr). Is there a way to flush the midi commands to ensure they actually send?