mqtt，Could not connect: CONNECTION_REFUSED_NOT_AUTHORIZED

mqtt IoT service，Could not connect: CONNECTION_REFUSED_NOT_AUTHORIZED

publish msg端：org，host，registered device type，registered device id，apikey，apitoken都必须一致才可以。

device端id格式：

String clientId = "d:" + org + ":" + "MqttUtil.DEVICE_TYPE" +  ":" + id;

// app key
String username = "use-token-auth";（just only this，not any others）
// app auth token
String password = "JNyh&!x9i0z1*daDb&";（registered device token）

也就是说，registered device apikey是没用的，只用到apitoken。

subscribe msg端：org，REGISTERED device id，host，registered app apikey，registered app apitoken用于subscribe msg。

app端id格式：String clientId = "a:" + org + ":" + id;