{
  "client-id": {
    "name": "client-id",
    "description": "MQTT client id",
    "type": "string",
    "attribute": "required",
    "default": "${node-name}",
    "valid": {
      "length": 255
    }
  },
  "event-topic-prefix": {
    "name": "event topic prefix",
    "description": "Prefix of the topics to which publish event messages.",
    "type": "string",
    "attribute": "required",
    "default": "/neuron/{client-id}",
    "valid": {
      "length": 255
    }
  },
  "heartbeat-interval": {
    "name": "heartbeat interval (seconds)",
    "description": "Interval in seconds between two heartbeat messages. Setting to zero will disable heartbeat monitoring.",
    "attribute": "required",
    "type": "int",
    "default": 0,
    "valid": {
      "min": 0
    }
  },
  "heartbeat-topic": {
    "name": "heartbeat topic",
    "description": "Topic to which publish heartbeat messages.",
    "type": "string",
    "attribute": "required",
    "default": "/neuron/${node-name}/heartbeat",
    "valid": {
      "length": 255
    }
  },
  "host": {
    "name": "host",
    "description": "MQTT broker host",
    "attribute": "required",
    "type": "string",
    "default": "broker.emqx.io",
    "valid": {
      "length": 255
    }
  },
  "port": {
    "name": "port",
    "description": "MQTT broker port",
    "attribute": "required",
    "type": "int",
    "default": 1883,
    "valid": {
      "min": 1024,
      "max": 65535
    }
  },
  "username": {
    "name": "username",
    "description": "User name",
    "attribute": "optional",
    "type": "string",
    "default": "",
    "valid": {
      "length": 255
    }
  },
  "password": {
    "name": "password",
    "description": "Password",
    "attribute": "optional",
    "type": "string",
    "default": "",
    "valid": {
      "length":255 
    }
  },
  "ssl": {
    "name": "ssl",
    "description": "Enable SSL connection",
    "attribute": "optional",
    "type": "bool",
    "default": false,
    "valid": {}
  },
  "ca": {
    "name": "CA",
    "description": "CA certificate file",
    "attribute": "required",
    "type": "file",
    "condition": {
      "field": "ssl",
      "value": true
    },
    "valid": {
      "length": 81960
    }
  },
  "cert": {
    "name": "client cert",
    "description": "client x509 certificate file",
    "attribute": "optional",
    "type": "file",
    "condition": {
      "field": "ssl",
      "value": true
    },
    "valid": {
      "length": 81960
    }
  },
  "key": {
    "name": "client key",
    "description": "client key file",
    "attribute": "optional",
    "type": "file",
    "condition": {
      "field": "ssl",
      "value": true
    },
    "valid": {
      "length": 81960
    }
  },
  "keypass": {
    "name": "keypass",
    "description": "key password",
    "attribute": "optional",
    "type": "string",
    "condition": {
      "field": "ssl",
      "value": true
    },
    "valid": {
      "length": 256
    }
  }
}