Chrome on macOS labels .bin files application/macbinary. Searching for application/octet-stream mistakes the image bytes for more part headers and aborts when the preamble buffer fills.
Find the multipart header terminator instead, after the HTTP separator retained by handle_post. Keep authentication, CRC checks and staging limits unchanged. Cover MacBinary, an omitted part Content-Type, and a split header terminator with exact staged-byte checks.
Address review by documenting regget 4 and RTL8373 N/non-N ID values under Step 4 of adding-a-device.md, without referring to a particular board or set of units. Keep the verified Horaco CPU and flash capacity in its device table and retain the unverified-chip caveat.
Read register 0x0004 on all three tested HC-SWTGW218AS units. Each returned 0x83730000, identifying RTL8373 rather than RTL8373N. Firmware reports 2 MB flash on all three.
Fill in the verified device-table fields and document the non-N/N register distinction. Leave PHY and flash-chip models explicitly unverified.
The HC-SWTGW218AS is listed only with the SWTG018AS-A V2.0 board, but it
also ships with SWTG118AS-V2.1, the board of the XikeStor SKS3200-8E1X.
That version runs MACHINE=SWTGW218AS: three such switches were flashed
through the OEM web upgrade and work.
Note in the device page that the model name alone does not tell which
firmware to build.
Andre Brait