Short description of user protocol

Symbol Function         Hardware     Argument
>      LED on           LED          none
<      LED off          LED          none
+      LED brighter     LED          none
-      LED shade        LED          none
0      Move Motor0      Motor0       int32_t
1      Move Motor1      Motor1       int32_t
2      Move Motor2      Motor2       int32_t
3      Move Motor3      Motor3       int32_t
4      Move Motor4      Motor4       int32_t
a      ADC get value    ADC          none
b      LED blink        LED          none
c      1-wire get dev   1-wire       none
h      Hall get state   Hall sensor  none
p      1-wire show dev  1-wire       none
t      1-wire get temp  1-wire       none

