Give a bit of a hint of the failure (read != expected) but don't make the error message needlessly more verbose.
Give a bit of a hint of the failure (read != expected) but don't make
the error message needlessly more verbose.

Discussed with: attilio

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