[amsat-bb] AISAT Downlink Issues -- Expected Behavior

[KE6BLR Robert]

As a followup to the earlier thread, I wrote a simple Python script that
provides the actual behavior side-by-side the expected behavior. Notice
this contains only 22 bytes in the Digipath compared to 29 bytes in the
actual Digipath. This is due to removing the extra blank field at the end
of the actual Digipath.

1: byteAsInt: 0, byteAsChar: , byteAsBits: 0b0, byteAsIntFixed: 0,
byteAsCharFixed: , byteAsBitsFixed: 0b0
2: byteAsInt: 134, byteAsChar: C, byteAsBits: 0b10000110, byteAsIntFixed:
134, byteAsCharFixed: C, byteAsBitsFixed: 0b10000110
3: byteAsInt: 162, byteAsChar: Q, byteAsBits: 0b10100010, byteAsIntFixed:
162, byteAsCharFixed: Q, byteAsBitsFixed: 0b10100010
4: byteAsInt: 64, byteAsChar:  , byteAsBits: 0b1000000, byteAsIntFixed: 64,
byteAsCharFixed:  , byteAsBitsFixed: 0b1000000
5: byteAsInt: 64, byteAsChar:  , byteAsBits: 0b1000000, byteAsIntFixed: 64,
byteAsCharFixed:  , byteAsBitsFixed: 0b1000000
6: byteAsInt: 64, byteAsChar:  , byteAsBits: 0b1000000, byteAsIntFixed: 64,
byteAsCharFixed:  , byteAsBitsFixed: 0b1000000
7: byteAsInt: 64, byteAsChar:  , byteAsBits: 0b1000000, byteAsIntFixed: 64,
byteAsCharFixed:  , byteAsBitsFixed: 0b1000000
8: byteAsInt: 96, byteAsChar: 0, byteAsBits: 0b1100000, byteAsIntFixed: 0,
byteAsCharFixed: 0, byteAsBitsFixed: 0b0
9: byteAsInt: 150, byteAsChar: K, byteAsBits: 0b10010110, byteAsIntFixed:
150, byteAsCharFixed: K, byteAsBitsFixed: 0b10010110
10: byteAsInt: 104, byteAsChar: 4, byteAsBits: 0b1101000, byteAsIntFixed:
104, byteAsCharFixed: 4, byteAsBitsFixed: 0b1101000
11: byteAsInt: 150, byteAsChar: K, byteAsBits: 0b10010110, byteAsIntFixed:
150, byteAsCharFixed: K, byteAsBitsFixed: 0b10010110
12: byteAsInt: 136, byteAsChar: D, byteAsBits: 0b10001000, byteAsIntFixed:
136, byteAsCharFixed: D, byteAsBitsFixed: 0b10001000
13: byteAsInt: 164, byteAsChar: R, byteAsBits: 0b10100100, byteAsIntFixed:
164, byteAsCharFixed: R, byteAsBitsFixed: 0b10100100
14: byteAsInt: 64, byteAsChar:  , byteAsBits: 0b1000000, byteAsIntFixed:
64, byteAsCharFixed:  , byteAsBitsFixed: 0b1000000
15: byteAsInt: 108, byteAsChar: 6, byteAsBits: 0b1101100, byteAsIntFixed:
12, byteAsCharFixed: 6, byteAsBitsFixed: 0b1100
16: byteAsInt: 130, byteAsChar: A, byteAsBits: 0b10000010, byteAsIntFixed:
130, byteAsCharFixed: A, byteAsBitsFixed: 0b10000010
17: byteAsInt: 146, byteAsChar: I, byteAsBits: 0b10010010, byteAsIntFixed:
146, byteAsCharFixed: I, byteAsBitsFixed: 0b10010010
18: byteAsInt: 166, byteAsChar: S, byteAsBits: 0b10100110, byteAsIntFixed:
166, byteAsCharFixed: S, byteAsBitsFixed: 0b10100110
19: byteAsInt: 130, byteAsChar: A, byteAsBits: 0b10000010, byteAsIntFixed:
130, byteAsCharFixed: A, byteAsBitsFixed: 0b10000010
20: byteAsInt: 168, byteAsChar: T, byteAsBits: 0b10101000, byteAsIntFixed:
168, byteAsCharFixed: T, byteAsBitsFixed: 0b10101000
21: byteAsInt: 84, byteAsChar: *, byteAsBits: 0b1010100, byteAsIntFixed:
64, byteAsCharFixed:  , byteAsBitsFixed: 0b1000000
22: byteAsInt: 96, byteAsChar: 0, byteAsBits: 0b1100000, byteAsIntFixed:
129, byteAsCharFixed: 0, byteAsBitsFixed: 0b10000001
robertmachale at Roberts-MacBook-Pro-484 ~/Documents/SCC/AISAT-EXPLAIN $

Notice bytes 8, 15, and 22 should be treated as SubFields where the SSID
occupies 4 bits rather than a fill ASCII single digit number.

Notice byte 21 should be a space because byte 22 in bit position 7 contains
the Digipeated "H" bit.

Byte 22 in bit position 0 should contain the "Dnd of Digipath" bit.

Let me know your feedback and how I can help.

73s

Robert