feat: add NTAG215/216 NDEF text record parser for filament

[bonduodevs]

Summary

Add NTAG215/216 (NFC Forum Type 2 Tag) support to the FM175xx RFID reader, enabling automatic filament identification from third-party NFC-tagged spools.

Motivation

The current RFID system only recognizes MIFARE Classic M1 cards (SAK=0x08), which limits filament auto-detection to official Snapmaker-tagged spools. Many third-party filament manufacturers/personal use NTAG215/216 NFC tags. This change allows those tags to be read and parsed automatically, providing material type and color information to the printer.

How It Works

• After ISO14443-A activation, the reader checks the SAK byte:
  • SAK=0x08 → existing M1 flow (unchanged)
  • SAK=0x00 → new NTAG flow: read user memory pages, parse NDEF Text Record
• Users write a simple MATERIAL#RRGGBB string to the NTAG tag using any NFC app (e.g. NFC Tools)
  • Example: PLA#FF5733 (orange PLA), PETG#FFFFFF (white PETG)
• The parsed material type is matched against the built-in filament_parameters database for temperature and flow defaults
• The filament info is delivered through the same callback pipeline as M1 cards — downstream code is unaware of the tag type

For basic users

• Write PLA#FF5733 as a Text Record on any NTAG215/216 tag using NFC Tools or similar app and U1 handles the rest automatically. It will now automatically detect your filaments in U1!

Changes (Too simple)

File	Change
klippy/extras/filament_protocol.py	Add ntag_ndef_data_parse() — NDEF TLV + Text Record parser, returns filament_info dict with VENDOR='Generic', OFFICIAL=False
klippy/extras/fm175xx_reader.py	Add FM175XX_MIFARE_CARD_TYPE_NTAG constant, __reader_a_ntag_read_user_data() page reader, and SAK-based elif branch in background thread
klippy/extras/filament_detect.py	Add elif routing for NTAG card type in _fm175xx_card_info_deal_callback

3 files changed, 203 insertions(+), 0 deletions(-)

Backward Compatibility

• No existing code modified — all changes are additive elif branches and new functions
• M1 card detection, HKDF authentication, and RSA signature verification are completely untouched
• No configuration changes required (printer.cfg works as-is)

Supported Tag Format

Field	Format	Example
NDEF Record Type	Text (T)	—
Language	any (skipped)	en
Payload	MATERIAL#RRGGBB	PLA#FF5733

Supported materials: PLA, PLA-CF, PETG, PETG-CF, PETG-HF, PCTG, ABS, ASA, TPU, PVA, PA, PA-CF, PA6-CF, PA-GF, PA6-GF, PC, PC-ABS, EVA