The serial port read is limited to 3 bytes.
Why?
Set level to reproduce:
$ sudo vi /etc/systemd/system/lbserver.service
LogLevelMax=debug
Nov 25 12:26:38 saturn LbServer[264389]: Received from port: A0 01 43
Nov 25 12:26:38 saturn LbServer[264389]: Received from port: 1D
Nov 25 12:26:38 saturn LbServer[264389]: Received message: A0 01 43 1D
SeeLocoBuffer.cpp: CLocoBuffer::ReceivePacket () Line 124
fix in r1367.