Because it looks like the communication drop outs are caused by some electrical issues and we can loose even a byte from the version response, which is deadly for future operation.
Communication timeout and Protocol Errors are now distinguished.
In case of a Protocol Error, the printer waits for heartBeatTimeout to allow filling up the input UART buffer (we expect the MMU still produces some bytes).
Once the timeout elapsed, the input UART buffer is cleared and a new Start Sequence is initiated.
Guðni Már Gilbert
D.R.racer
VintagePC