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急求技术支持，不知如何将WxBit版APP Inventor的MQTT客户端转化为App Inven...
手机APP代码块描述：设置了当MQTT连接建立之后订阅相关主题和连接断开后给出提示。
手机APP代码块描述：设置了按钮事件，当开锁按钮被点击后就通过主题发送数字1，反之发送数字0。
达到效果：手机APP端数据显示
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急求技术支持，不知如何将WxBit版APP Inventor的MQTT客户端转化为App Inven...
手机APP代码块描述：设置了当MQTT连接建立之后订阅相关主题和连接断开后给出提示。
手机APP代码块描述：设置了按钮事件，当开锁按钮被点击后就通过主题发送数字1，反之发送数字0。
达到效果：手机APP端数据显示
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急求技术支持，不知如何将WxBit版APP Inventor的MQTT客户端转化为App Inven...
...钮被点击后就通过主题发送数字1，反之发送数字0。
12.EasyIOT服务器端设置：设置了温度、湿度、光线强度、噪音、门锁5个主题。
实现效果：手机APP端数据显示
4.EasyIOT MQTT服务器端数据
连接、订阅、发布参考：
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How can I check the system version of Android?
Does anyone know how can I check the system version (e.g. 1.0 , 2.2 , etc.) programatically?
13 Answers
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The 'json' native gem requires installed build tools
I have ruby 1.9.2p180 (2011-02-18) [i386-mingw32] installed on my windows 7 machine. Now I tried to install the JSON gem using the command, "gem install json" and got the following error.
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How do you know what to test when writing unit tests? [closed]
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Passing an array to a function with variable number of args in Swift
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edited Dec 26 '17 at 14:27
Hasaan Ali
7951010 silver badges1818 bronze badges
answered Ju...
What is the difference between concurrency and parallelism?
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Difference between `constexpr` and `const`
... int main()
{
const int N = 3;
int numbers[N] = {1, 2, 3}; // N is constant expression
}
This is possible because N, being constant and initialized at declaration time with a literal, satisfies the criteria for a constant expression, even if it isn't declared constexpr....
C# 4.0: Can I use a TimeSpan as an optional parameter with a default value?
...meSpan? span = null) {
if (span == null) { span = TimeSpan.FromSeconds(2); }
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}
I should elaborate - the reason those expressions in your example are not compile-time constants is because at compile time, the compiler can't simply execute TimeSpan.FromSeconds(2.0) and stick the bytes o...