{
  "cdap": {
    "server": "ws://203.0.113.10:21122/cdap",
    "api_key": "YOUR_API_KEY",
    "device_name": "Modbus Bridge",
    "device_type": "bridge",
    "bridge_name": "modbus",
    "heartbeat_sec": 15
  },
  "modbus": {
    "transport": "tcp",
    "host": "192.168.1.100",
    "port": 502,
    "unit_id": 1,
    "timeout_sec": 5,
    "poll_interval_sec": 3,
    "serial_port": "/dev/ttyUSB0",
    "serial_baudrate": 9600,
    "serial_parity": "N",
    "serial_stopbits": 1
  },
  "registers": [
    {
      "widget_id": "temperature",
      "label": "Temperature",
      "type": "holding",
      "address": 0,
      "count": 1,
      "data_type": "int16",
      "scale": 0.1,
      "offset": 0,
      "unit": "°C",
      "widget": "gauge",
      "min": -20,
      "max": 80,
      "readonly": true
    },
    {
      "widget_id": "humidity",
      "label": "Humidity",
      "type": "holding",
      "address": 1,
      "count": 1,
      "data_type": "uint16",
      "scale": 0.1,
      "offset": 0,
      "unit": "%",
      "widget": "gauge",
      "min": 0,
      "max": 100,
      "readonly": true
    },
    {
      "widget_id": "relay_1",
      "label": "Relay 1",
      "type": "coil",
      "address": 0,
      "widget": "toggle",
      "readonly": false
    },
    {
      "widget_id": "setpoint",
      "label": "Setpoint",
      "type": "holding",
      "address": 10,
      "count": 1,
      "data_type": "int16",
      "scale": 0.1,
      "offset": 0,
      "unit": "°C",
      "widget": "slider",
      "min": 10,
      "max": 40,
      "step": 0.5,
      "readonly": false
    }
  ]
}