August 2017
Intermediate to advanced
272 pages
5h 32m
Chinese
Content preview from Node.js物聯網裝置開發
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第十一章 飛向雲端
有個公開的中介器
broker.hivemq.com
，用來開發 MQTT 服務，也有個在瀏覽器上執行
的 MQTT 客戶端（
http://hivemq.com/demos/websocket-client
）。當你在開發新服務時，絕
對都能派上用場。
PubNub
PubNub 不只是單純的 MQTT 中介器，還能夠以即時形式在網路上傳送訊息。
但從 MQTT 方面下手，會是學習使用 PubNub 不錯的起始點。如前面小節所述，
PubNub 也提供了 MQTT 中介器，然而相較之下，PubNub 採用識別碼 ID 作為頻道名
稱，這麼一來，使用 PubNub 時，將會看到特別的訊息格式，如下：
$ mqtt sub -v -h mqtt.pubnub.com '#'
pub-c-11817d38-b172-45f3-8214-280d8af48492/
sub-c-394a95fc-1cf5-11e5-a5e2-02ee2ddab7fe/my_channel 888PPM
pub-c-11817d38-b172-45f3-8214-280d8af48492/
sub-c-394a95fc-1cf5-11e5-a5e2-02ee2ddab7fe/test 888PPM
PubNub 採用「發佈鑰匙（publish key）」與「訂閱鑰匙（subscribe key）」作為主題名
稱，因此惡意攻擊者很難猜出頻道的名稱。與其繼續探索 PubNub 提供的 MQTT 服務
（
https://www ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.