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	Socket protocol.

All commands are 16 bits unsigned integers.

     D15 D14 D13 D12 D11 D10 RS  R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
      0   0   0   0   0   0   0   0   0   0   0   0   0   0   0   0	Null command to get keys state.
     LC2 LC1 LC0  0   0   0   0   0   0   0   0   0   0   0   0   1	Screen clear, home
     LC2 LC1 LC0  0   0   0   0   0   0   0   0   0   0   0   1   .	DDRAM AD=0, return
     LC2 LC1 LC0  0   0   0   0   0   0   0   0   0   0   1  I/D  S	Set moving direction of cursor
     LC2 LC1 LC0  0   0   0   0   0   0   0   0   0   1   D   C   B	Display Cursor Blink on/off
     LC2 LC1 LC0  0   0   0   0   0   0   0   0   1  S/C R/L  .   .	Remove cursor and display
     LC2 LC1 LC0  0   0   0   0   0   0   0   1   DL  N   F   .   .	Set DL display line font
     LC2 LC1 LC0  0   0   0   0   0   0   1				Set CGRAM send/receive data
     LC2 LC1 LC0  0   0   0   0   0   1					Set DDRAM sebd/receive data
     LC2 LC1 LC0  0   0   0   0   1   BF				Busy Flag
     LC2 LC1 LC0  0   0   0   1   0					Write data to CGRAM or DDRAM
     LC2 LC1 LC0  0   0   0   1   1					Read data from CGRAM or DDRAM
     LC2 LC1 LC0  0   0   1   0   0   .   .   .   .   .   .   .   .	LEDs, buzzer on/off
     LC2 LC1 LC0  0   1   0   0   1   0   0   0   0  Up  Dwn Ret Ent	Keys pressed
 

LC2 LC1 LC0 are the device index, 0..7
LEDs:	DB0	LCD backlight
	DB1	Control LED on thermferm panels
	DB2	HLT heater
	DB3	MLT heater
	DB4	MLT pump/mixer
	DB7	Buzzer

The thermferm or brewco units are leading, they send data and get a reply.
The sending data will mostly be display data mixed with LEDs. The replies
will mostly be the current key states, even if not changed. If the leading
program just wants key states, it should send a 0 to the brewpanel.