Lora-Mac=‎FFFFFFFFFFFFFFFF

[emerout]

Hello,

I have the same problem, address returned by lora.mac() is still FFFFFFFFFFFFFFFF.

History :

First time I played with Lopy, I have a different and right mac address.
Then I try to use a custom firmware, flash it, with no success (other story with external lib)

I came back to official firmware LoPy_868-1.7.6.b1.
And know it is stuck with this ffff... mac.

Any help appreciated !

[robert-hh]

@emerout Did you try to erase the flash with esptool.py?

[cinezaster]

@robert-hh I did try it to erase the flash.

[emerout]

@robert-hh said in Lora-Mac=‎FFFFFFFFFFFFFFFF:

@emerout Did you try to erase the flash with esptool.py?

I have performed :
$ bin/esptool.py --port /dev/tty.usbserial erase_flash

and then :
$ bin/updater.py -t Downloads/LoPy_868-1.7.8.b1.tar.gz -p /dev/tty.usbserial -s 921600 flash

re-uploaded my program,

No success, mac is still FFFF...

[emerout]

Is it possible to set lora device address programmatically when operate in OTAA mode ?

[robert-hh]

@emerout Did you check between erase & reflash, whether the device was erased? For instance by trying to run it.

[emerout]

@robert-hh Yes, after erase there wasn't any python >>> prompt.
Then after flashing firmware, my boot.py and main.py was gone.

[Xykon]

The Lora MAC is actually stored in flash memory. You can set it by uploading an 8 byte binary file containing your MAC address as /flash/sys/lpwan.mac (see github source)

Try running the following code directly on your LoPy to generate the file (make sure to use a unique MAC address):

fo = open("/flash/sys/lpwan.mac", "wb")
mac_write=bytes([0x01,0xb1,0xd1,0x41,0x91,0x31,0xb1,0xb4])
fo.write(mac_write)
fo.close()

Then reset your LoPy... you should see the following message during boot on the serial console: LPWAN MAC write OK

Let me know if this works for you

[emerout]

@Xykon That's work !! :-) thanks a lot

[cinezaster]

@Xykon Thanks

[Colateral]

@daniel For a custom firmware is always FFFFFFFFFFFF. There is some build parameter to get the mac as you have for official firmware? How we can set up the mac?

[KenM]

My lora mac ID changed after [v1.20.0.rc13] Release Candidate firmware update of my Lopy4?
I used the code above to change it back to the original mac ID.

I also did the firmware udpate on another Lopy4 but I didn't notice a connecton problem there.

[jg_spitfire]

@Xykon Hi, how could I make sure I am using an unique MAC?, thanks