This is a python script to allow configuring the Wireless configuration from Linux hosts.

It started from reverse-engineering the USB protocol, but got a huge boost from the DYMO Software Development team, who actually turned out to be approachable and were happy to provide detailed information about the protocol. Thanks, I appreciate that a lot!

Obviously all bugs in this program are my fault, not theirs.

To use this script simply run the python script with sufficient privileges to access the printers USB device - e.g. by starting it as root.

It will then talk to the printer and start a Wifi Scan on the printer. After 10-30s the discovered networks will be printed. Find your desired network and enter its number at the prompt. The script will then prompt for the Wifi password (it will be shown in clear text when you type it in!)

In the end it will activate the new network configuration in the printer.

If the printer behaves weird or no longer responds for some reason unplug it from USB and remove the battery for a few seconds.

Dymo has published a very useful Technical Reference for its LabelWriter family of printers, at the time of writing this is available at http://download.dymo.com/dymo/technical-data-sheets/LW%20450%20Series%20Technical%20Reference.pdf .

It describes in detail the commands for the labelwriters, which also incorporates some tape-specific commands since there are labelwriters that also can print label tape.

However, since there apparently are no wireless labelwriters, this reference fails to document the commands necessary for the configuration necessary. The following is a description of my understanding of the additional commands. Use at your own risk...

These commands are sent to the HID interface of the printer. I have not yet tested sending these to the Printer interface (when enabled).

1b 40 ?

This enables or disables the wifi interface. It takes some time to wake up, allow a little bit of time (>= 1s) before querying the wifi state.

1b 5a 01

This switches the printer to a different USB profile, where a USB printer interface is available in addition to a HID and Mass Storage interfaces.

1b 57 ? ? ? ? ? ? ?

This is an interface to the configuration storage of the printer. n identifies an object, l1 to l4 specify the length of the data (including the command itself, little endian) and n1 to nx are the extra payload data.

The response to this command consists of a single byte response-id, a two byte length value (total amount of data in the response) plus a single status byte, followed by the payload of the response.

I know about the following object / response ids

1b 57 00 07 00 00 00

This initiates a network scan. This will take some time to finish. The state of the scan can be queried via the 0x0c object.

1b 57 01 07 00 00 00

When the scan has finished (check via the 0x0c object) this object contains the scanned networks. Response: 0x81

1b 57 02 c0 00 00 00 < 185 bytes of network parameters >

This sets the network parameters for the desired network. this command consists of three HID packages a 64 bytes, the data is padded with zeroes, the total size of the configuration command is 192 bytes.

[TODO: description of the bytes follows]

This gets queried by the dymo setup tool, have not yet figured out what this is good for - it has Response 0x84 which in my case is all zeroes.

1b 57 05 40 00 00 00 <57 zeroes>

This seems to be necessary to activate the new network configuration. This expects 57 bytes of zeroes as data (i.e. padded to 64 bytes).

1b 57 08 07 00 00 00

This queries information about the network interface. Among other information this contains the MAC-Address of the printer.

(TODO: after power on this returns 00:01:02:03:04:05, not sure what is necessary to get the actual mac-address there...)

1b 57 0c 07 00 00 00

This queries the wifi network status. Response: 0x8c

0x8c 0xc0 0x00