MXW01 support requested - link to working code provided

[hippydave]

Hi,
This seems to be a fairly new model, its official app works with it but not much else seems to yet. If I "Test unknown device" it will attempt to print, but give the error "Characteristic 0000ae02-0000-1000-8000-00805f9b34fb not found!".

However I found someone figured out how to get it working with their own project, and shared the relevant source, if that could help someone kind to add it to this.

bitbank2/Print2BLE#22 (comment)

Many thanks!

I could try

[hippydave]

I could try

That would be really appreciated, thank you!

[Paffo]

I could try

I spent quite the time hitting my head on this printer and couldn't make it work.
The android app doesn't have things hardcoded as for other printers, so i cannot just copy them from there.
I used wireshark to capture some of the packets (the main difference i noticed is that commands start with 0x22,0x21 instead of 0x51,0x78) but i am not able for the love of all to get it to print, the only thing it can do is retract the paper.

Did you have better luck?

Did you have better luck?

Gosh no, I never got it to do print! I think the printer literally checks what type of bt device it's connecting to. In my testing, it always timed out when I tried connecting to it from my PC. However, when doing stuff from Android (the unofficial app), it would connect but not print anything.

I'm very puzzled.

Tried replaying packets, mocking the original app

Didn't work

I'll do more testing by wrangling BlueZ (running Linux on desktop)

[Paffo]

Did you have better luck?

Gosh no, I never got it to do print! I think the printer literally checks what type of bt device it's connecting to. In my testing, it always timed out when I tried connecting to it from my PC. However, when doing stuff from Android (the unofficial app), it would connect but not print anything.

I'm very puzzled.

Not sure about the model you have, but in mine the name is the same and the commands too, but your MAC address is different, in my case i had to change to:
printer.connect("MXW01", "48:0F:57:1C:AF:A4")

it connects, and i can send commands, but as mentioned the only thing i managed was sending "retract paper" command by accident (if you take the "set quality" for the normal printers and just replace the first 2 bytes, it will retract paper forever until you shut it down).

I with Wireshark i can see and replay the "single fire" commands, like "set quality" or similar, but i am not adept enough to understand how to print.

[Paffo]

No idea if it would help, but some obfuscated/deobfuscated things from the Android App.
Unfortunately it's webview not native so it's all JS bs:
update_print_density_list 2221A10001000000ff
cancel_print 2221AC0001000000ff
bq_learn 2221B2000100000000
find_status 2221f00101000107ff
print_hex "2221A9000400" + t.substr(12, 4)

what we would need is stored in js files loaded from the page "models/printer/android_ble.js" and "getApp().globalData", but unfortuantely these are not available in static analysis and i have no idea how to use Frida.

[hippydave]

Damn, sorry to hear it's such a struggle. Was really hoping that the source code I linked to would provide enough info to make it work.

Damn, sorry to hear it's such a struggle. Was really hoping that the source code I linked to would provide enough info to make it work.

More work is needed, I'm sure I'll get it to work sometime in the future!

[hippydave]

I have absolute faith in you 😎

[yaoleynikov]

Hello man's)

Also want know how setup this printer.
For me will be good for iphone.
Right now, ask eerimoq. Maybe he helps me.

https://github.com/eerimoq/moblin/tree/main/Moblin/Integrations/CatPrinter
eerimoq/moblin#102

[yaoleynikov]

Any updates?

[Paffo]

Any updates?

https://github.com/MaikelChan/CatPrinterBLE
Here's a working one, easy to modify too

[hippydave]

Someone's protocol docs https://github.com/jeremy46231/MXW01-catprinter/blob/main/PROTOCOL.md