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                # Protocol API 使用`pack`和`unpack`按照 MQTT 協議來進行打包和解析。 ## MQTT 3.1.x ```php Simps\MQTT\Protocol\V3::pack(array $array) Simps\MQTT\Protocol\V3::unpack(string $data) ``` ## MQTT 5.0 ```php Simps\MQTT\Protocol\V5::pack(array $array) Simps\MQTT\Protocol\V5::unpack(string $data) ``` ## Constants MQTT 協議等級和名稱的常量 ```php Simps\MQTT\Protocol\ProtocolInterface::MQTT_PROTOCOL_LEVEL_3_1; // 3.1 Simps\MQTT\Protocol\ProtocolInterface::MQTT_PROTOCOL_LEVEL_3_1_1; // 3.1.1 Simps\MQTT\Protocol\ProtocolInterface::MQTT_PROTOCOL_LEVEL_5_0; // 5.0 Simps\MQTT\Protocol\ProtocolInterface::MQISDP_PROTOCOL_NAME; // MQIsdp Simps\MQTT\Protocol\ProtocolInterface::MQTT_PROTOCOL_NAME; // MQTT ``` ## ReasonCode 原因碼小于`0x80`表示操作成功完成,成功的常規原因碼為`0`,原因碼值為`0x80`或更大表示失敗。 可以使用`ReasonCode::getReasonPhrase()`方法將原因碼轉為人類可讀的名稱。 ```php Simps\MQTT\Hex\ReasonCode::getReasonPhrase(0x86); Simps\MQTT\Hex\ReasonCode::getReasonPhrase(0x02, true); ```
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