communication

I need to do some communications over a serial port in Ruby. From my research, it appears that there aren't many modern libraries for serial communications and the newest material I can find is from 2006. Are there any gems that I'm not aware of? I ultimately need to maintain communications with a serial device attached to USB (I can figure out the port no problem) for back and forth communications like so (somewhat Ruby-esque pseudo code). def serial_write_read if serial.read == "READY" serial.write "1" until serial.read == "OK" serial.write "5" end return when serial.read == "DONE" end end

In any portlet application, if the same page containing a portlet is opened in two browser tabs, how is the event in the first page distinguished from the second page? I want to assign a unique Id for each event, store it and append it to the URL so that the link can be shared. Can someone provide their thoughts on this ? Also, if the page URL is opened on other computer the data shown on the page is the same as the data seen on the first computer. This is being set globally. How can I eliminate this? Tony Rad JSR-286 (latest Java Portlet Specification) defines Server Side and Client side

I have troubles with UsbRequest class in Android 3.1. This is my code: ByteBuffer buffer = ByteBuffer.allocate(4096); buffer.order(ByteOrder.LITTLE_ENDIAN); UsbRequest request = new UsbRequest(); request.initialize(mConnection, mEndpointIn); request.queue(buffer, 4096); if (mConnection.requestWait() == request) { byte[] data = buffer.array(); } The size of array data is 4096, but the length of really received bytes is much more smaller. How can i determine the size of really received bytes? Thanks. This was a bug in Android . On afflicted versions, there's no workaround, because the

I want to create a communication system with two clients and a server in Netty nio. More specifically, firstly, I want when two clients are connected with the server to send a message from the server and after that to be able to exchnage data between the two clients. I am using the code provided from this example . My modifications in the code can be found here: link It seems that the channelRead in the serverHandler works when the first client is connceted so it always return 1 but when a second client is connected does not change to 2. How can I check properly from the server when both

For example, when a web-browser connects to a web-server, it uses HTTP for a protocol at the application layer. But when a web-server connects to MySQL server, another database, what application layer protocol is used for the request and response? Or have I misunderstood something? Thank you! It's simply called "MySQL protocol". Refer to https://dev.mysql.com/doc/dev/mysql-server/latest/PAGE_PROTOCOL.html 来源： https://stackoverflow.com/questions/22860875/what-communication-protocol-does-mysql-use

I am working on MT4 and used wrapper mql4zmq.dll as given in link https://github.com/AustenConrad/mql4zmq As I have followed all instruction and successfully loaded DLL as well as lib file at specific locations from pre-compiled. But it can not bind or connect with socket through zmq_connect(,) or zmq_bind(,) . Please some one help me to solve this problem. I am posting my code here // Include the libzmq.dll abstraction wrapper. #include <mql4zmq.mqh> //+------------------------------------------------------------------+ //| variable definitions | //+-------------------------------------------

I'm using the code from Apple's Document to do some HTTP communication. I can connect to the URL successfully, but I failed to receive the data from my server. // create the request NSURLRequest *theRequest=[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://..."] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; // create the connection with the request // and start loading the data NSURLConnection *theConnection=[[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; if (theConnection) { // Create the NSMutableData that will hold // the received data //