Problem with Fingerprint verification

[miloit]

Hello,
I have problem with accepting my fingerprint
I use a json to store my fingerprint and than converting it, but gettng the error about a bad fingerprint

{"mqtt_ssl":"69:66:84:1A:0E:E7:E5:51:30:82:60:A7:27:F2:A5:54:56:B9:15:19"}
char mqtt_sslconverted[200] = "";
void convert (char* from, char* to) {
    memcpy(to,"0x",2); to += 2;
    for (; *from; from++) {
        if (*from==':') {
            memcpy(to,", 0x",4); to += 4;
        } else {
            *to++ = *from;
        }
    }
    *to = 0;
}
convert(mqtt_ssl,mqtt_sslconverted);
mqttClient.addServerFingerprint((const uint8_t*)mqtt_sslconverted);

But if I use your solution everything is fine

mqttClient.addServerFingerprint((const uint8_t[]){0x69, 0x66, 0x84, 0x1a, 0x0e, 0xe7, 0xe5, 0x51, 0x30, 0x82, 0x60, 0xa7, 0x27, 0xf2, 0xa5, 0x54, 0x56, 0xb9, 0x15, 0x19});

What is worng??

[Pablo2048]

(const uint8_t[]){.... mean binary array, your convert() converts text to another text... 🙄

[miloit]

closed

[bertmelis]

You could parse the string to a valid c array with some logic and -for example- https://en.cppreference.com/w/c/string/byte/strtol or you can encode an array in your json and use it like this: https://arduinojson.org/v6/api/misc/copyarray/

Or use any other programming logic to your liking.