{
  "_comment": "Modbus exception-injection profile — feeds exception_injector.py (not pymodbus). Rules match by (fc, address). HR[0-31] are address-as-value for the happy-path reads; HR[1000..1010] + coils[2000..2010] carry per-exception-code rules. Every code in the driver's MapModbusExceptionToStatus table that pymodbus can't naturally emit has a dedicated slot. See Docker/README.md §exception injection.",

  "listen": { "host": "0.0.0.0", "port": 5020 },

  "seeds": {
    "hr": {
      "0":  0, "1":  1, "2":  2, "3":  3,
      "4":  4, "5":  5, "6":  6, "7":  7,
      "8":  8, "9":  9, "10": 10, "11": 11,
      "12": 12, "13": 13, "14": 14, "15": 15,
      "16": 16, "17": 17, "18": 18, "19": 19,
      "20": 20, "21": 21, "22": 22, "23": 23,
      "24": 24, "25": 25, "26": 26, "27": 27,
      "28": 28, "29": 29, "30": 30, "31": 31
    }
  },

  "rules": [
    { "fc": 3,  "address": 1000, "exception": 1,  "description": "FC03 @1000 -> Illegal Function (0x01)" },
    { "fc": 3,  "address": 1001, "exception": 2,  "description": "FC03 @1001 -> Illegal Data Address (0x02)" },
    { "fc": 3,  "address": 1002, "exception": 3,  "description": "FC03 @1002 -> Illegal Data Value (0x03)" },
    { "fc": 3,  "address": 1003, "exception": 4,  "description": "FC03 @1003 -> Server Failure (0x04)" },
    { "fc": 3,  "address": 1004, "exception": 5,  "description": "FC03 @1004 -> Acknowledge (0x05)" },
    { "fc": 3,  "address": 1005, "exception": 6,  "description": "FC03 @1005 -> Server Busy (0x06)" },
    { "fc": 3,  "address": 1006, "exception": 10, "description": "FC03 @1006 -> Gateway Path Unavailable (0x0A)" },
    { "fc": 3,  "address": 1007, "exception": 11, "description": "FC03 @1007 -> Gateway Target No Response (0x0B)" },

    { "fc": 6,  "address": 2000, "exception": 4,  "description": "FC06 @2000 -> Server Failure (0x04, e.g. CPU in PROGRAM mode)" },
    { "fc": 6,  "address": 2001, "exception": 6,  "description": "FC06 @2001 -> Server Busy (0x06)" },

    { "fc": 16, "address": 3000, "exception": 4,  "description": "FC16 @3000 -> Server Failure (0x04)" }
  ]
}