PID(low) + ( PID(high) * 65536 ) = PID!
That doesn't work.
if my PID high was 65535 (0xFFFF)
and my PID low was 65535 (0xFFFF)
the PID would be 4294967295 (0xFFFFFFFF)
but 65535 + (65535 * 65535)
= 65535 + 4294836225
= 4294901760
which does not equal 4294967295 like it should.