Changing Bluetooth MIDI MTU on Android leads to no longer receiving sysex messages

Android
1

I’m trying to change the Bluetooth MIDI MTU in our Android app. The change is very simple in JuceMidiSupport.java:

public void onConnectionStateChange (BluetoothGatt gatt, int status, int newState)
{
    if (newState == BluetoothProfile.STATE_CONNECTED)
    {
        gatt.requestConnectionPriority (BluetoothGatt.CONNECTION_PRIORITY_HIGH);
        boolean ret = gatt.requestMtu(185); //<-- added this line
        owner.pairBluetoothDeviceStepTwo (gatt.getDevice ());
    }
}

However, this results in a rather weird bug: our app can no longer receive sysex messages. It receives note on/offs, CCs, pitch wheel changes, etc, but no sysex.

I do not have this issue with a similarly modified version of the midisuite apps, so it would seem to indicate some issue in the JUCE layer…?

2

Ah, I just noticed that I’m getting the sysex messages in the JUCE MidiDemo. Probably a bug in our app then!