SSR-SDU Firmware Release Notes

20241114 - v2.3.0
  - Branched from SSR-1U firmware 2.2.5
  - Added RecShell port function that allows a channel to operate as a record
    channel but redirect to the Shell upon request.  The default request
    condition is power at the Channel 4 port.
  - Added P19 Shell function to enable the shell on a channel assigned as
    function RecShell when main interface pin 19 is pulled low.
  - Updated LED activity to indicate RecShell shell state.  When shell is
    active on a RecShell channel, the green led will be solid for one second
    and show received activity for the next second.
   
