AT command to erase STA credentials

Hi Konstantin,

Thank you for posting your question online.
I was not able to locate any AT command to clear the STA credentials stored in the NVRAM without requiring a factory reset or reboot of the DA16200.
I believe you should add your own custom function and use the following NVRAM utility functions to implement what you want:

int read_nvram_int(const char *name, int *_val);
char *read_nvram_string(const char *name);

int write_nvram_int(const char *name, int val);
int write_nvram_string(const char *name, const char *val);
int delete_nvram_env(const char *name);
int clear_nvram_env(void);

int write_tmp_nvram_int(const char *name, int val);
int write_tmp_nvram_string(const char *name, const char *val);
int delete_tmp_nvram_env(const char *name);
int clear_tmp_nvram_env(void);

int save_tmp_nvram(void);

You can find these functions on the common_utils.h file. 
You should also refer to UM-WI-046, chapter 4. NVRAM, page:53
Please also see chapter 7 on page:56. You can find information on how to store/read data from the NVRAM and some code snippets examples.

Kind Regards,
OV_Renesas

Hi Konstantin,

Even though there is no command to erase the STA credentials without rebooting or factory reset, you could use the AT+WFDIS command which is for making the Wi-Fi STA profile unused. After that, if you invoke AT+WFJAP with another STA credential then the profile will be updated.

Please let me know if you have any questions.

Kind Regards,
OV_Renesas