make usart write buffer const
sub out magic numbers with defines
fix edge case handling 255/256 byte frames (including crc)
add sanity checks to avoid buffer overrun on some "should never happen" edge cases
don't wait for rats reply from card before listening to next reader frame
cap fsci to 8 (256 bytes) as that's the most the proxmark3 codebase currently handles
eliminate 1k of ram usage by tweaking how emulation responses are sent
Added NULL as `uint8_t *iRats` to all invokations in armsrc/Standalone.
Not sure if that is the right thing to do: The actual code checks for the presence of a special flag, but does not contain a check for NULL.
IMHO adding a NULL check in `iso14443a.c` line 1259 wouldn't hurt, and could catch programming errors (flag set by accident, but NULL passed).
Maybe @evildaemond wants to verify whether my fix does the right thing or if I missed something (they added the iRATs to `iso14443a.h` with 56324b16b2).
Allow button presses to break
Handle non-zero CID from reader by relaying RATS to the card and improving PPS and WTX handling
More reliably cook ATS values
Ignore packets that look like they're coming from the client (NG packets)
Adds the hf_cardhopper standalone mode, as one component of my (Sam Haskins) and
Trevor Stevado's long-range relay attack on ISO 14443-4 Type A protocols, as
presented at DEF CON 31.
