Function encodeUnsubscribe

encodeUnsubscribe(packetId: number, topicFilters: string[]): Uint8Array
Encodes an UNSUBSCRIBE packet.

Begins with the packet identifier, then a list of topic filters to remove. The fixed-header flags nibble is the spec-mandated 0x2.
Parameters
- packetId: number
  A non-zero packet identifier the matching UNSUBACK will echo.
- topicFilters: string[]
  One or more topic filters to unsubscribe from.
Returns Uint8Array
The UNSUBSCRIBE bytes.
Throws
If no topic filters are supplied.

Since
1.0.0
Example
```
import { encodeUnsubscribe } from 'edgeport/mqtt';

const bytes = encodeUnsubscribe(2, ['sensors/+/temp']);
```
- Defined in src/mqtt/packet.ts:517