Have you tried to decode the hex string back to ASCII?
Use https://www.binaryhexconverter.com/hex-to-ascii-text-converter and be surprised by the result.
BTW. sending ASCII text is extremely bad practice. The example code from microchip should not use it either. You should use https://www.thethingsnetwork.org/docs/devices/bytes/ (ignore the warning about V2) to find an efficient encoding.