Function parse

parse(content: string): { topic: string }
Parser for responseTopic tags - defines MQTT response topic paths

This parser handles the responseTopic tag that defines where responses or acknowledgments should be published for command/response patterns in MQTT. It extracts:
- Response topic path with placeholders
- Validates topic format
Parameters
- content: string
  Raw content from the responseTopic tag
Returns { topic: string }
Parsed response topic information with topic path, or null if parsing fails
Example: Command acknowledgment topic
```
// Input: "v1/{tenant}/devices/{deviceId}/commands/ack"
// Output: { topic: "v1/{tenant}/devices/{deviceId}/commands/ack" }
```
Example: Status response topic
```
// Input: "v1/{tenant}/devices/{deviceId}/status/response"
// Output: { topic: "v1/{tenant}/devices/{deviceId}/status/response" }
```
Example: Simple response topic
```
// Input: "responses/device-commands"
// Output: { topic: "responses/device-commands" }
```
Since
4.1.0

Public
- Defined in core/parsers/mqtt_response_topic.ts:34