discover_printers.exe - finds Continuum-compatible 3D printers on this network
=============================================================================

Run it from PowerShell, in the folder it is in. It only LISTENS and asks
printers who they are. It sends no passwords or access codes and changes
nothing on any printer.

The test we need (Bambu printers announce themselves over SSDP multicast,
which only works if this PC is on the SAME network segment as the printers -
same Wi-Fi/Ethernet, not through a VPN, not a guest network):

    .\discover_printers.exe raw 120 2>&1 | Tee-Object ssdp.txt

That listens for 2 minutes and prints EVERY datagram it hears, then what it
understood. Send back ssdp.txt. "listening for SSDP ... interfaces=[...]"
near the top lists the adapters it joined; the one on the printers' network
should be there.

Other commands:

    .\discover_printers.exe listen 30                 SSDP only, Bambu printers
    .\discover_printers.exe sweep 192.168.0.0/24      probe every address on a subnet
    .\discover_printers.exe all 192.168.0.0/24        both, merged
    .\discover_printers.exe identify 192.168.0.21     one known address

Windows Firewall will ask whether to allow it on first run. Allow it on
PRIVATE networks; without that, Windows drops the multicast and the result is
"No printers found" even when printers are there.

Check the file is intact:  Get-FileHash .\discover_printers.exe -Algorithm SHA256
(compare with SHA256.txt)