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MQTT物联网协议完全实践指南 · App Inventor 2 中文网
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// 设置不同QoS级别发布消息
when Button_PublishQoS0.Click
do
call UrsPahoMqttClient1.Publish "sensor/temperature", "25.6", 0
when Button_PublishQoS1.Click
do
call UrsPahoMqttClient1.Publish "control/light", "ON", 1
when Button_PublishQoS2.Click
do
call UrsPahoMqttClient1.Publ...
Why aren't ◎ܫ◎ and ☺ valid JavaScript variable names?
...net Explorer (but, unfortunately, not in the other browsers I tested), you can use some Unicode variable names. This made my day, and I was absolutely delighted that I could write fun Unicode-laden code like this:
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Parse XML using JavaScript [duplicate]
...h using GeoNames' FindNearestAddress.
If your XML is in a string variable called txt and looks like this:
<address>
<street>Roble Ave</street>
<mtfcc>S1400</mtfcc>
<streetNumber>649</streetNumber>
<lat>37.45127</lat>
<lng>-122.1...
How to create a self-signed certificate for a domain name for development?
...e subdomain.example.com that I use for development purposes. My web application solution contains a web API etc, that I need to call from external systems, hence I am not using localhost.
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Update just one gem with bundler
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Here you can find a good explanation on the difference between
Update both gem and dependencies:
bundle update gem-name
or
Update exclusively the gem:
bundle update --source gem-name
along with some nice examples of possible ...
Approximate cost to access various caches and main memory?
Can anyone give me the approximate time (in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors?
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How is the 'use strict' statement interpreted in Node.js? [duplicate]
I have started to explore the Node.js and wrote many demo web application, to understand the flow of Node.js, Express.js, jade, etc..
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Save current directory in variable using Bash?
... find the current working directory and save it into a variable, so that I can run export PATH=$PATH:currentdir+somethingelse . I'm not entirely sure if they have a variable that contains cwd by default.
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Convert a CERT/PEM certificate to a PFX certificate
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How can i achieve the same thing programmatically in C#?
– pankajt
Sep 24 '09 at 6:21
2
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Text Editor which shows \r\n? [closed]
I'm looking for a text editor that can show me the actual carriage returns and newlines.
17 Answers
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