This was missing from the previous HAL commit - it fixes a typo and introduces the PS-POLL hardware support.
This was missing from the previous HAL commit - it fixes a typo and
introduces the PS-POLL hardware support.

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase