samples: Bluetooth: df: Fix possible stack overflow issue

Host receive thread has small default stack size.
Attempt to convert data from binany to string requires
large array. Allocation of such array on stack could
cause stack overflow.

To limit the scope of the array and avoid stack overflow
the array is changed to be static local variable in a function.

Also the array has been prepared to accept max advertising
data sieze of 1650 bytes.

Signed-off-by: Piotr Pryga <piotr.pryga@nordicsemi.no>
1 file changed