Payload Templating

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Payload Templating
This page describes the template syntax used by akenza in more detail
Payload templating allows the customization of the payload of output connectors, rule actions, and access data of the uplink as well as other metadata by making use of a templating language.
The templating language can be used to add properties of the sample to the e-mail action body and subject.
Usage
To trigger the suggestions in the UI, simply enter double open curly brackets ({{) in the input field which will show available options. Make sure to end the expression by adding double closing curly brackets (}}).
Enclosed in the curly brackets, the access to any data sample or other properties is done using the dot-notation.
Consider the following structure:
{
    "data": {
        "time": "2021-03-02T11:37:00+000",
        "temp": 23.5,
        ...
    },
    ...
}
If e.g. the temperature value of the sample is to be added in the email body, the access to this value is as follows: {{data.temp}}.   
JSON Payload Templating
If the target e.g. a Webhook requires a different JSON object structure, the custom payload can be used in combination with the templating syntax to achieve a completely new JSON structure.
Consider the following structure of the sample:
{
    "data": {
        "time": "2021-03-02T11:37:00+000",
        "temp": 23.5,
        "state": "all ok",
        ...
    },
    ...
}
If the output to the webhook connector should look something like
{
    "temp": 23.5,
    "time": "2021-03-21T11:37:00+000",
    "state": "all ok",
    ...
}
The following template will achieve this:
{
    "temp": {{data.temp}},
    "time": {{data.time}},
    "state": {{data.state}},
    ...
}
NOTE: Previously all the templating expressions in JSON were enclosed in quotes in order to be a valid JSON object. This is no longer necessary since the templating engine will replace and encode/escape the value according to type.
Supported Properties
The following properties are supported:
data.* access any values of the sample
meta.* access any values of the meta object
result.* access any values of the custom rule logic result
uplinkMeta the complete uplink meta-object. See Uplink Meta Properties for sub-properties
topic the data topic
timestamp the timestamp of the sample
deviceId the unique device id of the device triggering the flow
akenzaDeviceId the akenza device id of the device triggering the flow
correlationId the correlation id of the flow
device the complete device object. See Device Properties for sub-properties
rule the complete rule object. See Rule Properties for sub-properties
dataSources all data source objects involved in the triggered flow. See Data Source Properties for sub-properties
Device Properties
The following properties of a device can be accessed when using template syntax.
Note: The prefix device. is always required in order to access sub-properties.
name the device name
description the device description
integrationId the integration Id of the device (only for LoRaWAN devices)
workspaceId the workspace Id of the device
dataFlowId the data flow Id of the device
connectivity the connectivity of the device
id the akenza device Id
deviceId the unique device id
customFields.* access Custom Fields values by their name
Rule Properties
The following properties of a rule can be accessed when using template syntax.
Note: The prefix rule. is always required in order to access sub-properties.
ruleId the id fo the rule
name the name of the rule (only for rules)
description the description of the rule
workspaceId the workspace Id of the rule
Data Source Properties
The following properties of a data source can be accessed when using template syntax.
To access a specific data source, use dataSources.X where X is the number of the data source as specified in the rule (starting at 1).
Some properties can be null in certain circumstances (e.g. the correlationId or the device) if e.g. the rule was triggered by a timer event or the data source is set to access the last sample.
Note: The prefix dataSources.X. is always required in order to access sub-properties.
correlationId the correlation id of the data source (only available if the data source was triggering the flow)
device the complete device object. See Device Properties for sub-properties
deviceId the unique device id
akenzaDeviceId the akenza device id
topic the topic of the sample
timestamp the timestamp of the sample
data.* access any values of the sample
meta.* access any values of the meta object
uplinkMeta the complete uplink meta object
trigger boolean indicates whether the data source has triggered the uplink
deviceInput boolean indicates if the data source is a device
tagInput boolean indicates if the data source is a tag
Uplink Meta Properties
The following properties of uplink metadata can be accessed when using template syntax
Note: The prefix uplinkMeta. is always required in order to access sub-properties.
dataReceived the ISO-8601 timestamp when the data was received
bytesReceived the number of bytes received in the uplink request
processingStart the ISO-8601 timestamp when the processing was started
scriptRunUplinkStart the ISO-8601 timestamp when script run was started
scriptRunUplinkEnd the ISO-8601 timestamp when script run ended
processingEnd the ISO-8601 timestamp when the processing ended
outputProduced the ISO-8601 timestamp when all output was produced
uplinkDuration the ISO-8601 duration of the whole uplink flow
processingDuration the IOS-8601 duration of the processing
scriptRunningDuration the ISO-8601 duration of the script run
Utility Functions
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Grafana Data Source Plugin
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Usage
JSON Payload Templating
Supported Properties