NVDA stops responding to key presses from my BT Speak Braille terminal, is this a bug in NVDA's HID Braille implementation, or what else could be causing this?

[emassey0135]

I am working on a Braille terminal application for the BT Speak, to allow it to control other devices. To do this, I am writing a Braille HID device implementation, using the Linux USB gadget framework and the built-in HID gadget. The way this works is after I create a HID gadget after passing an HID descriptor and some other parameters, I can send and receive HID reports on /dev/hidg0 and the Linux kernel is supposed to handle the rest like sending reports on the right channel and in response to GetReport requests. I have gotten it mostly working, where NVDA sees the BT Speak as a 20 cell HID Braille display (I had to include Braille output for NVDA to recognize it), and when I press keys on the BT Speak keyboard NVDA speaks them and types letters. However, when a contracted Braille input table is set, after pressing space NVDA stops responding to keys no matter what keys I press after, even if I restart NVDA. However, disconnecting the USB cable and reconnecting it fixes it without restarting NVDA or my program. Key combinations work as well, and when I press space or enter it does insert a space or return character. I also tested it with JAWS, and this issue does not occur; I was able to type in Braille and perform chord commands without issues. When I tested it with MacOS, all keys worked and VoiceOver never stopped responding to keys, but there was usually a delay of up to 10 seconds before VoiceOver recognized the key presses. How should I go about debugging this? Is this an issue with the Linux USB gadget driver, with NVDA, or something I can fix?

I have attached my HID descriptor (both in binary and text format as parsed by hidrdd), and I have tested my program by printing out the reports it sends to /dev/hidg0 and the bit for each key is being set in the report when sent and unset when released, and a new report is sent with each key event. Here is my HID library for reading and writing reports and descriptors, and here is my Braille terminal program.
hid-descriptor.txt
hid-descriptor-binary.txt

[emassey0135]

Also, there were no errors in the NVDA log.

[seanbudd]

Welcome @emassey0135

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NV Access Software Developers