Set MAC address?

[vshymanskyy]

I know how to get the MAC address:

unsigned char mac[6];
WiFi.macAddress(mac);

Is there any way to set it?
In the AT firmware, there are commands for this, so I think it should be possible:

AT+CIPSTAMAC=mac
AT+CIPAPMAC=mac

[chadouming]

This is not an issue, ask your question in relevant part of the forum : Forum

[vshymanskyy]

Actually it was meant as a feature request, as I didn't find anything like that (I looked into the code).
Sorry if I missed something...

[igrr]

This isn't implemented currently, but SDK has the wifi_set_macaddr function to set MAC addresses. There is a limitation though — this function has to be called early at startup, before setup() method is run. So it's not clear how to make this feature available through Arduino APIs. AT firmware saves the new MAC to EEPROM and restarts, if I remember correctly.

[vshymanskyy]

Thanks for a quick reply! Could we do it the same way, so for example it would change the MAC in the EEPROM, to be applied after restart (no need to restart immediately)?

[sunnyhighway]

I don't think wifi_set_macaddr would cause a reboot, because (according to the SDK programming guide) it returns true or false depending on succes or failure to do so.

It would be pointless to return anything at all if it would cause a reboot, would it?

[Links2004]

with my change it shut work like this:

extern "C" void __run_user_rf_pre_init(void) {
    uint8_t mac[] = {0x00, 0x01, 0x02, 0x03, 0x04, 0x05};
    wifi_set_macaddr(SOFTAP_IF, &mac[0]);
}

[ikin77]

Hi, does anybody knows why I do get this compiling error?

undefined reference to `wifi_set_macaddr(unsigned char, unsigned char*)'

I've used

#include <user_interface.h>
....

byte mac[6];
.... // Set mac value....
WiFi.macAddress(mac);
wifi_set_macaddr(STATION_IF, mac);
....

[luc-github]

did you add ?

extern "C" {
#include "user_interface.h"
}

[ikin77]

@luc-github
Thanks!!!! I just did "#include <user_interface.h>"

Now I can compile :o) Thanks again!!

[ikin77]

Hi. I can now change MAC address as STA and SOFAP. When I check on my router's page, I can see the MAC address, buy I can see the different devices names as "ESP-XXXX"

Can it be changed? I do I do it? Thanks again!!

[Links2004]

add:

WiFi.hostname("your name");

before WiFi.begin(...);

[vogtitec]

@ikin77
Could you please give a more complete example, WHERE in a sketch you put these lines of code into to change the MAC address of the unit?
byte mac[6];
.... // Set mac value....
WiFi.macAddress(mac);
wifi_set_macaddr(STATION_IF, mac);
....
I tried it in Links2004's example with
extern "C" void __run_user_rf_pre_init(void) ...
but I get a compile error as "previous declaration of 'void __run_user_rf_pre_init()' with 'C++' linkage" ...

Thanks a lot!

[ikin77]

Hi. Tomorrow morning I'll post the sample code.

Best regards.