BUILD_OK
N=1 downstream device(s), 5 KSV bytes:
  required   :  1  2  3  4  5
  DF (old)  :  1  2  3  4
  upstream  :  1  2  3  4
  => DF KSV stream CORRUPTS the required concatenation (first divergence at byte 5: got 0 want 5)

N=2 downstream device(s), 10 KSV bytes:
  required   :  1  2  3  4  5  6  7  8  9 10
  DF (old)  :  1  2  3  4  7  7  8  0
  upstream  :  1  2  3  4  5  6  7  8
  => DF KSV stream CORRUPTS the required concatenation (first divergence at byte 5: got 7 want 5)

N=3 downstream device(s), 15 KSV bytes:
  required   :  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15
  DF (old)  :  1  2  3  4  7  7  8  0 11 14  0  0
  upstream  :  1  2  3  4  5  6  7  8  9 10 11 12
  => DF KSV stream CORRUPTS the required concatenation (first divergence at byte 5: got 7 want 5)

N=4 downstream device(s), 20 KSV bytes:
  required   :  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
  DF (old)  :  1  2  3  4  7  7  8  0 11 14  0  0 29 14 15  0 17 18 19 20
  upstream  :  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20
  => DF KSV stream CORRUPTS the required concatenation (first divergence at byte 5: got 7 want 5)

N=5 downstream device(s), 25 KSV bytes:
  required   :  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
  DF (old)  :  1  2  3  4  7  7  8  0 11 14  0  0 29 14 15  0 17 18 19 20 21 22 23 24
  upstream  :  1  2  3  4  5  6  7  8  9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
  => DF KSV stream CORRUPTS the required concatenation (first divergence at byte 5: got 7 want 5)