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【持续更新】App Inventor 2 中文拓展一览 - App Inventor 2 中文网 - 清泛...
...）等图片格式的扩展
通信
【连接】ClientSocket 拓展：TCP/IP传输协议
【WIFI】TaifunWiFi 拓展：手机WiFi连接管理
【蓝牙】BlueToothLE 拓展：低功耗蓝牙(BLE) Iot 专题
【FTP】App Inventor 2 FTP 上传下载全方案总结
【MD5、密码安全】Enc...
App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
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MQTT 发明于 1999 年，为物联网设计的轻量级协议，基于TCP协议实现。
MQTT协议文档：https://mqtt.org/
MQTT服务质量（QoS）：3个等级
QoS0：最低质量等级，最多发送一次消息，在消息发出后，接收者不会发送应答，发送者也不...
App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...自己搭建。
账号注册请自行完成，如果看到的是TCP云，请切换到MQTT云：
输入名称（例如：APPMQTT），新建一个订阅主题：
MQTT客户端测试工具：https://mqttx.app/zh
App设计及代码
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App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...里以 bemfa.com 为例，账号注册请自行完成，如果看到的是TCP云，请切换到MQTT云：
输入名称（例如：APPMQTT），新建一个订阅主题：
MQTT客户端测试工具，下载地址：https://mqttx.app/zh/downloads
启动MQTTX客户...
When to use actors instead of messaging solutions such as WebSphere MQ or Tibco Rendezvous?
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Akka-Camel would be a better example than ZeroMQ - ZeroMQ is a direct tcp to tcp communication (hence zero - there is no message queue).
With AkkaCamel you can abstract away the queue and produce/consume messages direct from an actor without any code to deal with the message queue message push...
How to stop and restart memcached server?
... is currently runing:
sudo ps -e | grep memcached
And you can check the TCP or UDP ports if something (e.g. Memcache) is listening to it:
netstat -ap | grep TheChosenPort#
netstat -ap | grep 11211
For some Linuxes you need to change your commands like:
sudo /etc/init.d/memcached start
sudo /e...
How do I do a HTTP GET in Java? [duplicate]
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Technically you could do it with a straight TCP socket. I wouldn't recommend it however. I would highly recommend you use Apache HttpClient instead. In its simplest form:
GetMethod get = new GetMethod("http://httpcomponents.apache.org");
// execute method and handle a...
What browsers support HTML5 WebSocket API?
... Node.js)
Understands multiple network protocols out of the box including: TCP, SSL, UDP, HTTP, HTTPS, Websockets, SockJS as fallback for WebSockets
Pusher.com is a Websocket cloud service accessible through a REST API.
DotCloud cloud platform supports Websockets, and Java (Jetty Servlet Containe...
App Inventor 2 UrsAI2UDP 拓展 - UDP广播通信协议 · App Inventor 2 中文网
...向 LAN 中的设备发送数据是可行的，而反过来则不行。
TCP 也是如此。如果智能手机仅连接到蜂窝网络，则只能从智能手机建立连接。LAN 中的设备必须充当服务器，等待传入的连接请求。智能手机充当客户端，即它发起连接。建...
unable to start mongodb local server
...rt (27017)
command:
sudo netstat -tulpn | grep :27017
Output will be:
tcp 0 0 0.0.0.0:27017 0.0.0.0:*
LISTEN 6432/mongod
In my case "6432" is the pid, it may be different in your case.
Then kill that process using following command:
sudo kill <pid>
Thats ...