RetrieveFeatureDefinition

{
  "topic": "com.acme/xdk_53/things/twin/commands/retrieve",
  "headers": {},
  "path": "/features/accelerometer/definition"
}

RetrieveFeatureDefinitionResponse

{
  "topic": "com.acme/xdk_53/things/twin/commands/retrieve",
  "headers": {},
  "path": "/features/accelerometer/definition",
  "value": [
    "com.acme:accelerometer:1.0.0"
  ],
  "status": 200
}