SSID

Hello,
A cant figure it out how to use char* for SSID name.
Example:
String SN = “20210000”;
char* esp_ssid = “myNetwork”;
So, ESP will create Access point with name myNetwork. I want my SSID name to be myNetwork-20210000.
I tried:
char* esp_ssid = “myNetwork” + SN; or
char* esp_ssid = (“myNetwork-” + SN).c_str();
None works. Can you help me please.
Best regards,
Robert

3 Answers

0 Vote Up Vote Down

Bernie answered 3 years ago

Yes, I have the same problem. How does one convert String to char *?
c_str() does not seem to be in the library.

0 Vote Up Vote Down

Bernie answered 3 years ago

The following compiles, and surely works:

String SN = “20210000”;
const char *esp_ssid = (“myNetwork-” + SN).c_str();

Note the “const” for the char * pointer.

But you are better off not using String, and esp_ssid does not have to be const:

char esp_ssid[32];
char *SN = "20220000";
strcopy(strcopy(esp_ssid, “myNetwork-”), SN);

where

char *strcopy(char *p, const char *s) {
  while (*s != '\0') *p++ = *s++;
  *p = '\0';
  return p;
}

0 Vote Up Vote Down

Sara Santos Staff answered 3 years ago

Hi.
Bernie, thanks for answering.
Robert, can I close this issue?
Regards,
Sara