Build discover_printers for Windows on the Gitea runner

SSDP can only be tried on a machine that shares the printers' network segment, and the development container is a router hop away. This builds the existing discover_printers example as a Windows .exe and uploads it as a CI artifact, with a README for whoever runs it and a SHA-256 file. Uses the windows-latest self-hosted runner continuum-cad already uses (Windows PowerShell 5.1, MSVC present, upload-artifact@v3 only). The proxy links OpenSSL directly and Windows has none, so the job builds it with vcpkg (x64-windows-static-md, linked into the .exe) in a directory of its own, away from the CAD pipeline's. The job smoke-runs the exe, then runs the discovery tests on Windows after the upload, so a Windows-only test failure turns the job red without withholding the executable. Not run anywhere yet: this container cannot build for Windows (no MSVC or mingw). The first CI run is the first real build. Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
2026-10-29 10:54:07 +00:00
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+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)