ESP8266 - problem comparing strings in commands from phone

Hello forum,
i have this problem :

I download a command from my phone under the form of a string, when I want to compare this command to some other string nothing happens :/

The best thing is that the recived: command displays on the serial. That is, the command received is correct. The comparison if(command == "cos") doesn't work anymore. Does anyone have any suggestions for a solution?

Full code here at the very bottom.


Piece of code:

Eeee, hmm... because that's not how you compare strings That's how you can compare numbers, single characters (it works for you e.g. checking the last character in the "c" variable) etc. For strings you should use for example strcmp
https://pl.wikibooks.org/wiki/C/strcmp

Thanks, I didn't know about that. Although I've been comparing like that forever and it usually works :/

And you see, I got distracted because in the header of the code frame is "Code: c" Somehow that obscured the syntax visible further down
I also thought that the strings were not properly terminated by incorrectly adding consecutive characters (no null), but it looks ok though.... hmm.

I know, it's a bit hard. I'm agonising over it a lot, I can't find the error for anything :/

And don't you happen to have one string as "Info" and the other as "info"?
Just a thought...

No, all commands are always in lower case. I even angered the newline character '\n' and it didn't do anything either :/

Maybe start with a single character, then you will know if the comparison works at all.

You have special characters in the string(\nmaybe also \r) and that's probably why it doesn't work. Try this:

And you don't happen to be using a terminal that terminates lines by /r/n? Then when you compare "info" and the received "info/r" (and followed by the /n you are checking), you have different strings.... Add yourself a character counter to verify this, or use a terminal like TeraTerm for example, which displays CR and LF characters....

Edit: I bookmarked myself and in the meantime fellow ppc added his post, so I'm late I gave a helpful post, because according to me this is the solution

Indeed, the culprit was the sign \r (what does this sign mean?). Now everything works, thank you very much.

\carriage return(Carriage Return, CR)
\new line (Line Feed, LF)

Depending on the operating system, terminal program, etc., the end of a line is encoded differently. This also applies to text files. You can read more about this here:

https://pl.wikipedia.org/wiki/Koniec_linii
https://pl.wikipedia.org/wiki/CRLF

You can find a list of control characters in the C and C++ languages here:

https://en.wikipedia.org/wiki/Escape_sequences_in_C

Thank you for all your answers.