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LEGO EV3 机器人传感器面板 · App Inventor 2 中文网
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这是一个基于 MIT App Inventor 开发的 LEGO EV3 传感器监控应用。通过蓝牙连接手机与 EV3 机器人，实时显示颜色传感器、超声波传感器和触碰传感器的状态数据。
项目作者：CAVEDU Education
难度级别：中级
预计时间：1小时
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What is the overhead of creating a new HttpClient per call in a WebAPI client?
...is disposed, it disposes HttpClientHandler, which then forcibly closes the TCP/IP connection in the pool of connections that is managed by ServicePointManager. This means that each request with a new HttpClient requires re-establishing a new TCP/IP connection.
From my tests, using plain HTTP on a ...
Max parallel http connections in a browser?
...zing-front-end-back-end-705/
HTTP/2(SPDY)
Multiplexed support(one single TCP connection for all requests)
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How to configure logging to syslog in Python?
... the local host for logging, whether to /dev/log or localhost through the TCP stack. This allows the fully RFC compliant and featureful system logging daemon to handle syslog. This eliminates the need for the remote daemon to be functional and provides the enhanced capabilities of syslog daemon's s...
Remote debugging with Android emulator
... connect command that cmb mentioned, but I can confirm that forwarding the TCP ports yourself — such as over SSH — works fine.
The emulator listens on two TCP ports per instance: 5554 for the telnet interface and 5555 for control communication with tools like DDMS. So you could probably get aw...
Django connection to PostgreSQL: “Peer authentication failed”
...sockets. On the other hand, when the HOST is "localhost", it connects via TCP/IP to 127.0.0.1. Likely, your pg_hba.conf is set up to deny ordinary users from connecting through UNIX sockets but allows them over TCP/IP from localhost.
– Jim Garrison
May 1 '13 ...
How do I determine if a port is open on a Windows server? [closed]
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Assuming that it's a TCP (rather than UDP) port that you're trying to use:
On the server itself, use netstat -an to check to see which ports are listening.
From outside, just use telnet host port (or telnet host:port on Unix systems) to see if ...
Will HTML5 allow web apps to make peer-to-peer HTTP connections?
...to peer connections from javascript, but these connections WILL NOT BE RAW TCP.
The complete spec can be found at http://dev.w3.org/html5/websockets/
jrh
EDIT: with specific reference to peer to peer connections, check out these links:
Regarding peer to peer connections: http://www.w3.org/TR/20...
IPC performance: Named Pipe vs Socket
...ll get with Shared Memory solution.
Named pipes are only 16% better than TCP sockets.
Results are get with IPC benchmarking:
System: Linux (Linux ubuntu 4.4.0 x86_64 i7-6700K 4.00GHz)
Message: 128 bytes
Messages count: 1000000
Pipe benchmark:
Message size: 128
Message count: 1000...
What are the differences between WCF and ASMX web services?
...on, a console app - you have total freedom
used with HTTP (REST and SOAP), TCP/IP, MSMQ and many more protocols
In short: WCF is here to replace ASMX fully.
Check out the WCF Developer Center on MSDN.
Update: link seems to be dead - try this: What Is Windows Communication Foundation?
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