./hostside-old [<options>] <nmra-command> <nmra-args...>    see nmra-packets.h
./hostside-old [<options>] nmra_bytes <nmra-command-hex-no-csum>
./hostside-old [<options>] nmra_raw <nmra-command-hex-with-csum>
./hostside-old [<options>] command <literal-data-for-pic>
 options
  -s<serialport>   eg -s/dev/ttyS0  normally necessary
  -w<repeatdelay>  usleep; 0 = no usleep; default is -1 = don't repeat at all
  -i<iterations>   default is 0 = infinite; -1 means don't repeat
                      *** the above seems wrong; -1 seems to mean infinite
			*** and 0 means once ?!
  -f<fudgedelay>   usleep; each character; default is 0 = no usleep

Eg,
 ./hostside-old -s/dev/ttyS0 -w10000 -i1000 nmra_bytes 0348
to tell decoder 3 to go speed 13 backwards every 10ms for 1000 times, ie 10s
 (on norway this means it actually happens every 20ms, ie for 20s,
   which makes it a bit of a fudge really)

 ff       ff       80       e4       c1       17         output bytes
 11111111 11111111 10000000 11100100 11000001 00010111   as bits
 >1111111 >1111111 >0000000 >1100100 >1000001 $0010111   top bit: >/$ for pic

 1111111 1111111  0 00000011 0 01001000 0 01001011 1     reorg bits for nmra:
  preamble (14)   S 0AAAAAAA P 01DCSSSS 0 EEEEEEEE 1
                    03    (+)  48       = 4b ok

To test:
 ./hostside-old -st nmra_bytes 0348 && binview t




Protocol over new hostside stdin:
                                            Example (always the same msg):
 P> nmra [*<slot>] [<nmra-command [<nmra-args>...]]    nmra speed28 3 13 1
 P> nmra [*<slot>] [=<nmra-bytes>]                     nmra =0348
 P> nmra [*<slot>] [:<nmra-bytes-with-csum>]           nmra :03484b
 P> nmra [*<slot>] [_<pic-literal-bytes>]              nmra _7f7f00644197
   in each case *<slot> indicates that the message should be put in
   the retransmission cycle, and cancels any previous message with the
   same *<slot>.  <slot> may be empty.
 P> nmra *<slot>
   cancels the relevant retransmission.

                                            Example (always the same msg):
 P> pic =<pic-bytes>                                   pic =a003
 P> pic <pic-command> [<pic-args...]                   pic point 3
       the latter for commands with no `...' in README.protocol only

 Keen readers will observe that
    pic =<pic-bytes>    and
    nmra _<pic-bytes>
 do exactly the same.

 P> polarity <bit-string-in-hex>....
       where, eg, with 14 segments,
	                 [      1]    [111 1111]    reversible
	       [123]     [56 7890]    [123 4567]     segment number
	 1 0010 000    1 000 1000    0 111 1010     example POLARITY
	 1 0010 RRR    1 RRR RRRR    0 RRR R---      from README.protocol
		RRR      RRR RRRR      RRR R        actual R bits
		\__        ___/\__      ___/         ... which map ...
		   RRRRRRRR       RRRRRR             ... into data ...
		   RRRRRRRR       RRRRRR--           ... like this.
		   00000010       00111100
                                 [ 1111111]         reversible
                  [12345678]     [90123456]          segment number
		     0x02           0x3c            hex values
                       023c                         hex data string

 Up< pic-out <hex-bytes...>
 Up< pic-in <hex-bytes...>

 U< count <type> <number-in-decimal>
      eg  count polarity 14
 U< pic detect 1|0 <S>
 U< pic point <P>
 U< pic pointed <P>
 U< pic charged <P>
 U< polarity <bit-string-in-hex>....
 U< polarised <bit-string-in-hex>....