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lf_nedap_sim.md

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LF_NEDAP_SIM — Nedap RFID Simple Simulator

Frequency: LF (125 kHz) Hardware: Generic Proxmark3

Back to Standalone Modes Index | Source Code | Development Guide

What

Simulates a Nedap RFID tag with a hardcoded ID. Supports both 64-bit and 128-bit Nedap formats, including proper CRC and framing.

Why

Nedap is a less common but still-deployed access control system, particularly in Europe. This mode lets you test Nedap readers by simulating a known tag. Since Nedap cards are less commonly available than HID, having a simulator is valuable for testing.

How

  1. The firmware encodes a hardcoded Nedap tag structure (subType, customerCode, id)
  2. It generates the proper bit sequence with CRC calculation
  3. Continuously transmits the encoded tag via LF modulation
  4. Supports 128-bit "long" format when isLong=1

Default hardcoded values: subType=5, customerCode=0x123, id=42424, isLong=1

LED Indicators

LED Meaning
Minimal LED usage Simple continuous simulation mode

Button Controls

Action Effect
Hold 1000ms Exit standalone mode
USB command Exit standalone mode

State Machine

stateDiagram-v2
    [*] --> Simulate : Startup

    Simulate --> Simulate : Continuous transmission
    Simulate --> [*] : Button hold 1s / USB data
Loading

Customization

To change the simulated tag, edit the hardcoded values in the source:

static NedapTag_t tag = {
    .subType = 0x5,
    .customerCode = 0x123,
    .id = 42424,
    .isLong = 1,
};

Compilation

make clean
make STANDALONE=LF_NEDAP_SIM -j
./pm3-flash-fullimage

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