MATH: I don't understand the sequence, blue tooth

I have a bluetooth device.
I was able to hack it so far that i can send values to the device.

The values should go from 0 to 100.
The values i reproduce from what an app sends to the device.

The following 11 commands i reproduced are those:
The first one represents a value of 0, the second 1, then 2 ... up to 10

06:81:66:00:00:4f:c2
06:81:66:00:64:63:e0
06:81:66:00:c8:17:86
06:81:66:01:2c:99:1d
06:81:66:01:90:ff:4a
06:81:66:01:f4:d3:68
06:81:66:02:58:f2:5d
06:81:66:02:bc:4f:f7
06:81:66:03:20:3e:f3
06:81:66:03:84:cb:9d
06:81:66:03:e8:66:b7

Now i try to understand the sequence of this values.
Does anyone has an idea how to find the sequence?

edit your post and alter the subject line to include blue tooth.

Hex notation
00:00 -> 0
00:64 -> 100
00:C8 -> 200
01:2C -> 300
etc.

Thank you sterretje, that's it.

But what could the other four at the end be? maybe a checksum?

Suigor:
Thank you sterretje, that's it.

But what could the other four at the end be? maybe a checksum?

How the Hell do we know?
You've shown neither code nor what devices you're using