MQTT
MQTT 是甚麼
（Message Queuing Telemetry Transport，訊息佇列遙測傳輸）是一種輕量級的發布／訂閱（Publish/Subscribe）網路通訊協定。它專為低頻寬、高延遲、不穩定的網路環境及資源受限的裝置所設計，現已成為物聯網（IoT）與即時通訊的行業標準。現在很多簡易設備都支援 mqtt, 透過 publish 就可以讓監聽的所有監聽者(sub) 收者收到訊息， 非常方便實用。通訊量又相對少。
範例: A 訂閱主題weather, B也訂閱主題weather; 那麼C只要發布訊息到weather的主題, A, B 自動會收到訊息。 C不用去維護到底要把訊息送給誰。這樣的架構裡，必須有一台MQTT server / broker; 其他要傳送接收訊息的使用者為MQTT client, 網路上會有很多MQTT server, 他們之間也可以互相傳輸資訊。
I didn't vote for you. You can't expect to wield supreme power just 'cause some watery tart threw a sword at you! Bring her forward! He hasn't got shit all over him. He hasn't got shit all over him. We shall say 'Ni' again to you, if you do not appease us.
Well, we did do the nose. Why? Now, look here, my good man. Be quiet! Well, what do you want?
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What do you mean? We shall say 'Ni' again to you, if you do not appease us. I have to push the pram a lot. No, no, no! Yes, yes. A bit. But she's got a wart. What a strange person.
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And this isn't my nose. This is a false one. We found them. Listen. Strange women lying in ponds distributing swords is no basis for a system of government. Supreme executive power derives from a mandate from the masses, not from some farcical aquatic ceremony.
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Knights of Ni, we are but simple travelers who seek the enchanter who lives beyond these woods. Why? Well, what do you want? …Are you suggesting that coconuts migrate?
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Well, I got better. Knights of Ni, we are but simple travelers who seek the enchanter who lives beyond these woods. Found them? In Mercia?! The coconut's tropical! A newt? …Are you suggesting that coconuts migrate?
I don't want to talk to you no more, you empty-headed animal food trough water! I fart in your general direction! Your mother was a hamster and your father smelt of elderberries! Now leave before I am forced to taunt you a second time! We want a shrubbery!!
Well, how'd you become king, then? Found them? In Mercia?! The coconut's tropical! Oh, ow! I am your king.
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Well, Mercia's a temperate zone! You don't vote for kings. Now, look here, my good man.
Who's that then? Well, we did do the nose.
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I don't want to talk to you no more, you empty-headed animal food trough water! I fart in your general direction! Your mother was a hamster and your father smelt of elderberries! Now leave before I am forced to taunt you a second time! The nose?
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