leaking memory

[homonto]

hi,
this line:

char *payloadhex = utils.buildHexData(nullptr, payload, payloadlen);

leaks memory because it is missing free:

free(payloadhex);

after some time esp32 gets 0 bytes free memory (depends how often you call this function).

problem is that: char* BLEUtils::buildHexData(); does not free the memory so once you call it, you need to free manually before next loop/call/whatever

and onResult() is repeated all the time you receive data so after some time you get restart of esp32 once no more memory left