Bluetooth LE - how to convert received data bytes to ASCII chars?

MIT App Inventor Help
1

Hello!

How to convert received data from BLE device to display them as ASCII chars, not as a numbers (DEC or HEX).

I will be gratefull very much for help.

BR,
Jakub

2

Normally, people register for strings and receive a list of strings at a time.

If you can only receive a list of Bytes, here is some conversion code, courtesy of Italo:
asc asc_test AsciiCHRASCprocedures.aia (4.0 KB)

blocks
blocks781×1184 75.7 KB
bytes_to_text
bytes_to_text721×291 22.9 KB
chr chr_test strip_STX_ETX
testdata
testdata773×87 7.14 KB

1 Like
3

Hi can Jakub_Papuga-Szalaps,

did you ever decode your bytes to ASCII text ?

I just get,
invalid text operation Segment: Start is less than 1(0)

when I try to copy from byte list to other list

4

Your byte list is empty.

Here is a more bulletproof asc() procedure, though it will not get to the root of your problem, only cover it up ...

asc
asc1476×406 53.6 KB

5

Thanks ABG , I just added this but as you say It only masked another problem.
https://community.appinventor.mit.edu/t/checking-4-bytes-to-mark-beginning-and-end-of-a-data-packet-on-incoming-bluetooth-data/3182/31