decoder_control.cgi?command=
 0 - go UP
 1 - stop
 2 - go DOWN
 3 - stop
 4 - go LEFT
 5 - stop
 6 - go RIGHT
 7 - stop
25 - center (=recalibrate)
26 - vertical patrol
27 - stop vertical patrol
28 - horizontal patrol
29 - stop horizontal patrol
30 - set point 1
32 - set point 2
34 - set point 3
36 - set point 4
38 - set point 5
40 - set point 6
42 - set point 7
44 - set point 8
46 - set point 9
48 - set point 10
50 - set point 11
52 - set point 12
54 - set point 13
56 - set point 14
58 - set point 15
60 - set point 16
31 - goto point 1
33 - goto point 2
35 - goto point 3
37 - goto point 4
39 - goto point 5
41 - goto point 6
43 - goto point 7
45 - goto point 8
47 - goto point 9
49 - goto point 10
51 - goto point 11
53 - goto point 12
55 - goto point 13
57 - goto point 14
59 - goto point 15
61 - goto point 16
90 - go LEFT_UP
91 - go RIGHT_UP
92 - go LEFT_DOWN
93 - go RIGHT_DOWN
94 - IO output high
95 - IO output low