How to use the string to use it static const *in

Sato

Hello,
Instead of writing the tokens in the code, I would like to save the token Out and the token In in two files in SPIFFS. On startup I read from the file the line of the token into a variable of type String, but I haven't succeeded yet, it gives conversion error on compilation. Does anyone know how to do it?

// file content:
cbbb726f-1e9b-4da2-a121-acf2da1f6d98

String inToken = "";
file = SPIFFS.open("/inToken.txt");//file in SPIFFS
while (file.available()) {
inToken = file.readStringUntil('\n'); // read line with the token
}
//---static const char *In = "cbbb726f-1e9b-4da2-a121-acf2da1f6d98"

static const char *In = inToken; // compile error
file.close();

Thanks
Regards

kl3m3n

@sato said in How to use the string to use it static const *in:

static const char *In = inToken

Hello,

just use "String inToken..." directly, e.g.:

mqttClient.publish(&inToken[0], ...)

or

mqttClient.publish(inToken.c_str(), ...)

You can apply the same principle to "String outToken" that you read from a file.

You can drop "In" and "Out" variables...

Best regards,
kl3m3n

Sato

Thank You, @kl3m3n

Will try it tomorrow

Best regards

Sato

Hi @kl3m3n,

Thanks for the tip, it works well

Best regards

kl3m3n

@Sato Great!

Best regards,
kl3m3n