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towelbyte
93631d06d7
- Implemented passive mode for COTAG sim:
- load modulation with an fc/2 subcarrier locked to the reader carrier.
- This mode is now a default as it has several advantages:
- phase coherent response,
- can detect reader field drop mid frame "transmission" and restart
immediately -- important with some readers that may drop field
early and send reactivation shortly afterwards expecting the
tag to respond there as well.
- "active tx mode" is now via CLI toggle --active: it may give better range,
but may not work with all readers.
- Improved COTAG activation sequence detection for a wider range of COTAG
readers that may vary slightly in activation sequence timings (thresholds
for the rise-to-rise mode).