Retrieve a definition

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

{
  "topic": "com.acme/xdk_53/things/twin/commands/retrieve",
  "headers": {},
  "path": "/definition",
  "value": "digitaltwin:DigitaltwinExample:1.0.0",
  "status": 200
}