mpetrov
2 years ago
12 changed files with 188 additions and 49 deletions
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///
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/// Copyright © 2016-2024 The Thingsboard Authors
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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import { Pipe, PipeTransform } from '@angular/core'; |
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import { GatewayVersion } from '@home/components/widget/lib/gateway/gateway-widget.models'; |
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import { |
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GatewayConnectorVersionMappingUtil |
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} from '@home/components/widget/lib/gateway/utils/gateway-connector-version-mapping.util'; |
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@Pipe({ |
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name: 'isLatestVersionConfig', |
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standalone: true, |
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}) |
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export class LatestVersionConfigPipe implements PipeTransform { |
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transform(configVersion: number | string): boolean { |
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return GatewayConnectorVersionMappingUtil.parseVersion(configVersion) |
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>= GatewayConnectorVersionMappingUtil.parseVersion(GatewayVersion.Current); |
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} |
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} |
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### Expressions |
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#### JSON Path: |
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The expression field is used to extract data from the MQTT message. There are various available options for different parts of the messages: |
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- The JSONPath format can be used to extract data from the message body. |
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- The regular expression format can be used to extract data from the topic where the message will arrive. |
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- Slices can only be used in the expression fields of bytes converters. |
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JSONPath expressions specify the items within a JSON structure (which could be an object, array, or nested combination of both) that you want to access. These expressions can select elements from JSON data on specific criteria. Here's a basic overview of how JSONPath expressions are structured: |
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- `$`: The root element of the JSON document; |
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- `.`: Child operator used to select child elements. For example, $.store.book ; |
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- `[]`: Child operator used to select child elements. $['store']['book'] accesses the book array within a store object; |
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##### Examples: |
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For example, if we want to extract the device name from the following message, we can use the expression below: |
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MQTT message: |
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``` |
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{ |
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"sensorModelInfo": { |
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"sensorName": "AM-123", |
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"sensorType": "myDeviceType" |
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}, |
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"data": { |
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"temp": 12.2, |
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"hum": 56, |
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"status": "ok" |
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} |
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} |
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{:copy-code} |
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``` |
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Expression: |
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`${sensorModelInfo.sensorName}` |
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Converted data: |
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`AM-123` |
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If we want to extract all data from the message above, we can use the following expression: |
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`${data}` |
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Converted data: |
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`{"temp": 12.2, "hum": 56, "status": "ok"}` |
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Or if we want to extract specific data (for example “temperature”), you can use the following expression: |
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`${data.temp}` |
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And as a converted data we will get: |
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`12.2` |
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<br/> |
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