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MQTT相关知识研究笔记 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...过于依赖他们的硬件），巴法云（技术纯粹一些，还支持TCP长连接），阿里云（企业版收费，可免费试用，步骤复杂），华为云（暂未研究）。
国外的平台：
HiveMQ公共测试：https://www.mqtt-dashboard.com/
EMQX：broker.emqx.io
4...
AppInventor2如何通过socket给网络发16进制的数据？ - App应用开发 - 清泛I...
...能发ASCLL码？没办法收发HEX，蓝牙组件的有写字节功能，TCP网络组件没有。
答：
发送文本消息时，hexaStringMode设为 false；发送16制消息时，hexaStringMode设为 true，例如：0x012 —> “303132” 字符串发送，接收的数据也是16进...
App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...
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 息屏后连接会断开，需要深入研究一下 - 用户反馈 - 清泛IT社区，为创新赋能！
如题，tcp，蓝牙，mqtt 等连接都会断开。
有办法避免吗？
重连策略有效解决吗？
When to use actors instead of messaging solutions such as WebSphere MQ or Tibco Rendezvous?
...
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]
...
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...
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 ...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...你想测试Rsyslog性能如何的话，可以考虑使用官方提供的tcpflood。
实例演示
在我们动手之前，有必要了解一下Rsyslog的工作流程，说起来非常简单：首先数据通过输入模块进入主队列，然后经由过滤条件分解到各个子队列，最后...