Function decodePacket

decodePacket(bytes: Uint8Array): DecodedPacket
Decodes one complete MQTT control packet from a buffer.

Reads the fixed header, then dispatches on the packet type to parse the variable header and payload, returning a DecodedPacket discriminated on type. The buffer must hold exactly one full packet starting at offset 0; callers framing a stream should use decodeRemainingLength to size each packet before slicing it out. A CONNACK is decoded loosely so a v5 broker's extra trailing bytes (properties) are ignored rather than rejected.
Parameters
- bytes: Uint8Array
  A buffer beginning with a single complete packet.
Returns DecodedPacket
The decoded packet.
Throws
If the header is malformed or the type is unsupported.

Since
1.0.0
Example
```
import { decodePacket, PacketType } from 'edgeport/mqtt';

const pkt = decodePacket(new Uint8Array([0x20, 0x02, 0x00, 0x00]));
if (pkt.type === PacketType.CONNACK) console.log(pkt.returnCode); // 0
```
- Defined in src/mqtt/packet.ts:579