error message!! please help me.

Using Arduino Project Guidance
1

C:\Users\Ce PC\Documents\Arduino\gsm_gprs_gps_m_moir_sans_fonction_sentATcommand\fonction_gsm_gprs.ino: In function 'void raccrocher()':

C:\Users\Ce PC\Documents\Arduino\gsm_gprs_gps_m_moir_sans_fonction_sentATcommand\fonction_gsm_gprs.ino:3:34: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]

sendATcommand("ATH", "OK", 3000);

^

C:\Users\Ce PC\Documents\Arduino\gsm_gprs_gps_m_moir_sans_fonction_sentATcommand\fonction_gsm_gprs.ino:3:34: warning: deprecated conversion from string constant to 'char*' [-Wwrite-strings]

what can i understand about this? need help

2

Those are warnings, not errors. They do not interfere with the program.

I would love to know what the incantation is to remove the warnings is, though - I always have to wade through those when I'm looking for the important warnings.

3

I would love to know what the incantation is to remove the warnings is, though

sendATcommand((char *)"ATH", (char *)"OK", 3000);

The string literal, "ATH" is a constant. You can not change it at run time. The function expects a char *, not a const char * (though there is NO reason for the function to change what the pointer points to, so the argument SHOULD be const char *, not char *). Casting the const char * to a char * removes the warning.