hidraw access not working with Android 6.0
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I have a bluetooth hid device that I need to communicate with. Target platform is Android 5.x+. Currently testing on Nexus 7 2013 tablet.
My code works fine on android 5.x, I am able to receive, send and set reports on Android 5.x.
On Android 6.x, I am only able to receive reports sent by device, but I am not able to send or set reports. i.e. write() to file descriptor for /dev/hidraw0 does not result in any reports being sent to device. It looks like my set/send report requests are silently ignored by HID/BT stack.
The code that talks to /dev/hidraw* nodes runs as a native daemon as root.
Are there any new requirements to be able to set/send reports to Bluetooth hid devices on Android 6.x? Are there any changes I could make to AOSP to allow this to work?