Upstream only checks left stick X axis, so pressing buttons, using
the d-pad, or moving the right stick won't prevent disconnection.
Extends the same dead zone pattern to cover both sticks (all 4 axes),
both button bytes, and d-pad/misc bytes.
l2cap_send was passed the caller's `len` (expected response size) instead of
the actual array size. The get_feature array is only 2 bytes (transaction
header + report ID), so this read up to 62 bytes of uninitialized stack.
Use sizeof(get_feature) to send only the 2-byte GET_REPORT request.
dereckhall