There are some strange things:
i wrote a binary file fron 0x00 to 0xff
app inventor reads the file an put every byte in the list and tells me List Lenght is 256 -> correct
on ESP32 i get these 256 Bytes
But just 0x00 to 0x7F are correct
Here the output:
0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 13 14 15
16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27 28 29 2A 2B
2C 2D 2E 2F 30 31 32 33 34 35 36 37 38 39 3A 3B 3C 3D 3E 3F 40 41
42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53 54 55 56 57
58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67 68 69 6A 6B 6C 6D
6E 6F 70 71 72 73 74 75 76 77 78 79 7A 7B 7C 7D 7E 7F EF BF BD EF
EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF
EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF
EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF
EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF
EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF
EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF BF BD EF