Reverse the modification which caused the annoying m_copydata crash: set the TF_ACKNOW flag when the REXMT timer goes off to force a retransmission.  In certain situations pulling snd_nxt back to snd_una is not sufficient.
Reverse the modification which caused the annoying m_copydata crash: set
the TF_ACKNOW flag when the REXMT timer goes off to force a
retransmission.  In certain situations pulling snd_nxt back to snd_una
is not sufficient.

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