成员的完整列表，这些成员属于 MQTTClient_connectOptions,包括所有继承而来的类成员

binarypwd	MQTTClient_connectOptions
cleansession	MQTTClient_connectOptions
cleanstart	MQTTClient_connectOptions
connectTimeout	MQTTClient_connectOptions
data	MQTTClient_connectOptions
httpHeaders	MQTTClient_connectOptions
httpProxy	MQTTClient_connectOptions
httpsProxy	MQTTClient_connectOptions
keepAliveInterval	MQTTClient_connectOptions
len	MQTTClient_connectOptions
maxInflightMessages	MQTTClient_connectOptions
MQTTVersion	MQTTClient_connectOptions
password	MQTTClient_connectOptions
reliable	MQTTClient_connectOptions
retryInterval	MQTTClient_connectOptions
returned	MQTTClient_connectOptions
serverURI	MQTTClient_connectOptions
serverURIcount	MQTTClient_connectOptions
serverURIs	MQTTClient_connectOptions
sessionPresent	MQTTClient_connectOptions
ssl	MQTTClient_connectOptions
struct_id	MQTTClient_connectOptions
struct_version	MQTTClient_connectOptions
username	MQTTClient_connectOptions
will	MQTTClient_connectOptions