MqttRpcDevice 构造函数 (MqttConnectionOptions, String)

public MqttRpcDevice(
	MqttConnectionOptions options,
	string topic = null
)

Public Sub New ( 
	options As MqttConnectionOptions,
	Optional topic As String = Nothing
)

public:
MqttRpcDevice(
	MqttConnectionOptions^ options, 
	String^ topic = nullptr
)

new : 
        options : MqttConnectionOptions * 
        ?topic : string 
(* Defaults:
        let _topic = defaultArg topic null
*)
-> MqttRpcDevice