Timeseries Data

Timeseries Data Messages

Output (Number/Boolean/String) Objects support the following attribute:

Attribute	Required	Description
payload	required	Number, Boolean or String value, depending on the data_type

In order to publish an output Data Message, the first requirement is to add the intended outputs to the app.yaml as follows:

app:
  type: kelvin
  kelvin:

    outputs:
    - data_type: number
      name: motor_temperature_fahrenheit

    - data_type: boolean
      name: motor_error

    - data_type: string
      name: motor_error_description

Afterwards, the user needs to create and publish each output Data Message according to its data_type: - Number:

from kelvin.message import Number
from kelvin.krn import KRNAssetDataStream

(...)

# Create and Publish a Number
await app.publish(
    Number(resource=KRNAssetDataStream(asset, "motor_temperature_fahrenheit"), payload=97.3)
)

- Boolean:

from kelvin.message import Boolean
from kelvin.krn import KRNAssetDataStream

(...)

# Create and Publish a Boolean
await app.publish(
    Boolean(resource=KRNAssetDataStream(asset, "motor_error"), payload=True)
)

- String:

from kelvin.message import String
from kelvin.krn import KRNAssetDataStream

(...)

# Create and Publish a String
await app.publish(
    String(resource=KRNAssetDataStream(asset, "motor_error_description"), payload="Temperature is too high")
)