I am trying to append the length of a string pointer which is integer to another string using sprintf. But every time i get "conflicting declarations for variable “_sprintf” ". What are the possible reasons for this error? I need some serious help guys!
The pointer *p is not initialized. You are trying to print a string to a pointer, which is not initialized and has no allocated memory. Declare p as a character array of an arbitrary size instead of pointer.
Edited Code:
void esp8266(const char *data)
{
char p[20]; //<------------ change to array
int msglen = strlen(data);
sprintf(p, "AT+CIPSEND=0,%d", msglen);
}
Not sure what triggered the above error. Have you include stdio.h in your code? If not make sure, you have stdio.h included at the top all your header files.