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ESP8285接入App Inventor 2深度调研：4种连接方案+是否需要开发拓展 - 创客...
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App Inventor端：直接用内置Web组件，Url设为 http://ESP8285的IP/led?state=1 ，调用 Web1.Get()
优点：零拓展开发，内置组件即可
缺点：只能手机主动请求，不能实时推送
方案2：TCP Socket方式(已有拓展)
原理：ESP8285运行TCP Server，Ap...
Regex select all text between tags
What is the best way to select all the text between 2 tags - ex: the text between all the 'pre' tags on the page.
17 Answe...
Chrome DevTools Devices does not detect device when plugged in
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Found it under Developer options > Select USB configuration. Changed it to "PTP (Picture Transfer Protocol)", but didn't solve the problem
– zok
Jul 5 '16 at 10:56
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Accessing localhost:port from Android emulator
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You can access your host machine with the IP address "10.0.2.2".
This has been designed in this way by the Android team. So your webserver can perfectly run at localhost and from your Android app you can access it via "http://10.0.2.2:<hostport>".
If your em...
MySQL error: key specification without a key length
...d, and the trick is to choose a number N that’s long enough to give good selectivity, but short enough to save space. The prefix should be long enough to make the index nearly as useful as it would be if you’d indexed the whole column.
Before we go further let us define some important terms. In...
How do SO_REUSEADDR and SO_REUSEPORT differ?
...sts for the source address, which can be "any address" (0.0.0.0 in case of IPv4 and :: in case of IPv6). Unlike in case of ports, a socket can really be bound to "any address" which means "all source IP addresses of all local interfaces". If the socket is connected later on, the system has to choose...
html select option separator
How do you make a separator in a select tag?
14 Answers
14
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Is there any JSON Web Token (JWT) example in C#?
...gnedTokens = true,
IssuerSigningKeys = certificates.Values.Select(x => new X509SecurityKey(x)),
IssuerSigningKeyResolver = (token, securityToken, kid, validationParameters) =>
{
return certificates
.Where(x...
Gmail Error :The SMTP server requires a secure connection or the client was not authenticated. The s
... Yes, the reason is 2 steps verification switched On for gmail account. Select App/Device and click Generate button support.google.com/accounts/answer/185833
– smily
Dec 25 '15 at 15:34
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Convert text into number in MySQL query
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This should work:
SELECT field,CONVERT(SUBSTRING_INDEX(field,'-',-1),UNSIGNED INTEGER) AS num
FROM table
ORDER BY num;
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