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App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...果如下：
App设计及代码
服务器地址：bemfa.com
端口：9501
客户端ID：（MQTT云控制台获取）
订阅主题：APPMQTT
新建项目，导入MQTT拓展，可在“界面设计”的拓展属性中进行服务器通信基本设置：
也可以在“程序设计...
Efficiently test if a port is open on Linux?
...mp;6
I'm using 6 as the file descriptor because 0,1,2 are stdin, stdout, and stderr. 5 is sometimes used by Bash for child processes, so 3,4,6,7,8, and 9 should be safe.
As per the comment below, to test for listening on a local server in a script:
exec 6<>/dev/tcp/127.0.0.1/445 || echo "N...
Broadcast receiver for checking internet connection in android app
...c void onReceive(Context context, Intent intent) {
Bundle extras = intent.getExtras();
NetworkInfo info = (NetworkInfo) extras
.getParcelable("networkInfo");
State state = info.getState();
Log.d("TEST Internet...
How large should my recv buffer be when calling recv in the socket library
...atagram socket (SOCK_DGRAM) - within TCP/IP, the former corresponds to TCP and the latter to UDP.
How do you know how big to make the buffer passed to recv()?
SOCK_STREAM: It doesn't really matter too much. If your protocol is a transactional / interactive one just pick a size that can hold the ...
Remote debugging Tomcat with Eclipse
... it. Eclipse doesn't actually say anything when it successfully connects, and reconnecting a second time forces the error. So it was working, but I just didn't notice.
– victor
Oct 1 '10 at 17:18
...
Send inline image in email
...
Try this
string htmlBody = "<html><body><h1>Picture</h1><br><img src=\"cid:filename\"></body></html>";
AlternateView avHtml = AlternateView.CreateAlternateViewFromString
(htmlBody, ...
What resources are shared between threads?
...gment from the DATA segment. Sometimes there is RODATA (Data like constant strings that can be in pages marked Read Only). Some systems even break DATA into SMALL DATA (accessible from a base + 16-bit offset) and (FAR) DATA (32-bit offset required to access). It's also possible that there is an extr...
Git SSH error: “Connect to host: Bad file number”
...
At the "Paste the following code in it:", I don't understand. How am I suppose to resolve bad file number? Should I create it and save as notepad file?
– David Dimalanta
Jul 9 '13 at 1:12
...
Find all storage devices attached to a Linux machine [closed]
...2.6.17 and up):
#! /bin/bash
hal-find-by-property --key volume.fsusage --string filesystem |
while read udi ; do
# ignore optical discs
if [[ "$(hal-get-property --udi $udi --key volume.is_disc)" == "false" ]]; then
dev=$(hal-get-property --udi $udi --key block.device)
f...
When NOT to use Cassandra?
... time at 2 different ATMs, you will get 2 times $100, and a letter with an extra fee in your mail box. The bank earns money (the extra fee for being below the limit) by using inconsistent data. It's to hard to connect all ATMs in the world with each other through one large relational database. Can y...