[
  {
    "val": "1",
    "name": "Payload Format Indicator",
    "type": "Byte",
    "appliesTo": ["PUBLISH", "Will Properties"]
  },
  {
    "val": "2",
    "name": "Message Expiry Interval",
    "type": "Four Byte Integer",
    "appliesTo": ["PUBLISH", "Will Properties"]
  },
  {
    "val": "3",
    "name": "Content Type",
    "type": "UTF-8 Encoded String",
    "appliesTo": ["PUBLISH", "Will Properties"]
  },
  {
    "val": "8",
    "name": "Response Topic",
    "type": "UTF-8 Encoded String",
    "appliesTo": ["PUBLISH", "Will Properties"]
  },
  {
    "val": "9",
    "name": "Correlation Data",
    "type": "Binary Data",
    "appliesTo": ["PUBLISH", "Will Properties"]
  },
  {
    "val": "11",
    "name": "Subscription Identifier",
    "type": "Variable Byte Integer",
    "appliesTo": ["PUBLISH", "SUBSCRIBE"]
  },
  {
    "val": "17",
    "name": "Session Expiry Interval",
    "type": "Four Byte Integer",
    "appliesTo": ["CONNECT", "CONNACK", "DISCONNECT"]
  },
  {
    "val": "18",
    "name": "Assigned Client Identifier",
    "type": "UTF-8 Encoded String",
    "appliesTo": ["CONNACK"]
  },
  {
    "val": "19",
    "name": "Server Keep Alive",
    "type": "Two Byte Integer",
    "appliesTo": ["CONNACK"]
  },
  {
    "val": "21",
    "name": "Authentication Method",
    "type": "UTF-8 Encoded String",
    "appliesTo": ["CONNECT", "CONNACK", "AUTH"]
  },
  {
    "val": "22",
    "name": "Authentication Data",
    "type": "Binary Data",
    "appliesTo": ["CONNECT", "CONNACK", "AUTH"]
  },
  {
    "val": "23",
    "name": "Request Problem Information",
    "type": "Byte",
    "appliesTo": ["CONNECT"]
  },
  {
    "val": "24",
    "name": "Will Delay Interval",
    "type": "Four Byte Integer",
    "appliesTo": ["Will Properties"]
  },
  {
    "val": "25",
    "name": "Request Response Information",
    "type": "Byte",
    "appliesTo": ["CONNECT"]
  },
  {
    "val": "26",
    "name": "Response Information",
    "type": "UTF-8 Encoded String",
    "appliesTo": ["CONNACK"]
  },
  {
    "val": "28",
    "name": "Server Reference",
    "type": "UTF-8 Encoded String",
    "appliesTo": ["CONNACK", "DISCONNECT"]
  },
  {
    "val": "31",
    "name": "Reason String",
    "type": "UTF-8 Encoded String",
    "appliesTo": [
      "CONNACK",
      "PUBACK",
      "PUBREC",
      "PUBREL",
      "PUBCOMP",
      "SUBACK",
      "UNSUBACK",
      "DISCONNECT",
      "AUTH"
    ]
  },
  {
    "val": "33",
    "name": "Receive Maximum",
    "type": "Two Byte Integer",
    "appliesTo": ["CONNECT", "CONNACK"]
  },
  {
    "val": "34",
    "name": "Topic Alias Maximum",
    "type": "Two Byte Integer",
    "appliesTo": ["CONNECT", "CONNACK"]
  },
  {
    "val": "35",
    "name": "Topic Alias",
    "type": "Two Byte Integer",
    "appliesTo": ["PUBLISH"]
  },
  {
    "val": "36",
    "name": "Maximum QoS",
    "type": "Byte",
    "appliesTo": ["CONNACK"]
  },
  {
    "val": "37",
    "name": "Retain Available",
    "type": "Byte",
    "appliesTo": ["CONNACK"]
  },
  {
    "val": "38",
    "name": "User Property",
    "type": "UTF-8 String Pair",
    "appliesTo": [
      "CONNECT",
      "CONNACK",
      "PUBLISH",
      "Will Properties",
      "PUBACK",
      "PUBREC",
      "PUBREL",
      "PUBCOMP",
      "SUBSCRIBE",
      "SUBACK",
      "UNSUBSCRIBE",
      "UNSUBACK",
      "DISCONNECT",
      "AUTH"
    ]
  },
  {
    "val": "39",
    "name": "Maximum Packet Size",
    "type": "Four Byte Integer",
    "appliesTo": ["CONNECT", "CONNACK"]
  },
  {
    "val": "40",
    "name": "Wildcard Subscription Available",
    "type": "Byte",
    "appliesTo": ["CONNACK"]
  },
  {
    "val": "41",
    "name": "Subscription Identifier Available",
    "type": "Byte",
    "appliesTo": ["CONNACK"]
  },
  {
    "val": "42",
    "name": "Shared Subscription Available",
    "type": "Byte",
    "appliesTo": ["CONNACK"]
  }
]