{
  "name": "sensor_data",
  "type": "function",
  "groups": ["Sensors"],
  "description": "Returns the last captured value (or values as a map for sensors which report multiple values) from a registered sensor.",
  "arguments": [{
    "arg": "name",
    "description": "the sensor name"
  },{
    "arg": "expiration",
    "description": "maximum millisecond since last captured value allowed",
    "optional": true
  }],
  "examples": [{
    "expression": "sensor_data('geiger_1')",
    "returns": "'2000'"
  }]
}