TINI /> java DataLoggertini 60 120 & Starting DataLogger in Java

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TINI /> java DataLoggertini 60 120 & Starting DataLogger
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A maximum number of 60 samples was speci ed along with a 120-second delay between each sample After running the server for several minutes to allow it to acquire a few samples, we can run the client Here is the sample output for DataLoggerClient that is run on a Win2K machine
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Building a Remote Data Logger
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java DataLoggerClient 192168015 Total readings=3 Entry 0:Fri Feb 02 14:20:41 CST 2001, RH=27733103869596295, TEMP=2353125 Entry 1:Fri Feb 02 14:22:42 CST 2001, RH=28067076700395877, TEMP=234375 Entry 2:Fri Feb 02 14:24:42 CST 2001, RH=2773123954744912, TEMP=2328125
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By examining the time stamp, we can see that each sample was taken just over two minutes apart If we let the server run more than two hours, it will ll its sample vector, and running the client would result in 60 data samples If we let the server continue to run for days, weeks, or even months, we would still get 60 samples, but they would always represent readings taken within the last two hours In the next section, support will be provided for managing a PPP interface We can then use the same client we developed in this section to test DataLogger s ability to accept connections over both Ethernet and PPP network interfaces
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IMPLEMENTING THE PPP DAEMON
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Now on to the business of making our remote data logger truly remote We ll accomplish this by adding support for establishing dial-up networking connections to our logger using the PPP network interface and supporting API classes At this point we re going to bring a second server into the picture, which could become confusing The top-level network server is what we implemented in the DataLogger class in Section 72 It blocks on accept, waiting for a connection over any network interface It doesn t really care if the connection is established over an Ethernet network or a serial line using PPP The server we ll implement in this section is a dial-up server that allows clients to establish TCP/IP connections to TINI using a PPP interface For the sake of brevity, we ll just refer to the dial-up server as the server However, when both servers are a part of the discussion context, we ll explicitly refer to the dial-up server We ll implement our dial-up server in a class named PPPDaemon A portion of the PPPDaemon class is shown in Listing 710 PPPDaemon implements two interfaces: PPPEventListener to receive PPP event noti cation and DataLinkListener to receive noti cation about errors that occur with the physical data link In this section, we won t get too concerned about the details of the underlying physical link and whether the connection is established over a hard-wired serial link or using modems Then next section will deal with the low-level data link handling issues On construction PPPDaemon requires an instance of a class that implements the PPPDaemonListener interface shown in Listing 711 The daemonError interface method is invoked by PPPDaemon to provide asynchronous noti cation of a PPP or data link error to the listener The isValidUser method is invoked after the server has received the client s login information This gives the listener the nal say on whether a PPP connection is accepted or rejected
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Implementing the PPP Daemon Listing 710 PPPDaemon
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import javaio*; import comdalsemitininetppp*; public class PPPDaemon implements PPPEventListener, DataLinkListener { private PPP ppp; private PPPDataLink dataLink; private int maxRetries; private PPPDaemonListener listener; public PPPDaemon(PPPDaemonListener listener, String portName, int speed) throws PPPException { this(listener, portName, speed, 3, true); } public PPPDaemon(PPPDaemonListener listener, String portName, int speed, int maxRetries, boolean modemLink) throws PPPException { thislistener = listener; thismaxRetries = maxRetries; try { if (modemLink) { dataLink = new PPPModemLink(portName, speed, this); } else { dataLink = new PPPSerialLink(portName, speed, this); } } catch (DataLinkException dle) { throw new PPPException("Unable to initialize PPPDaemon:" + dlegetMessage()); } ppp = new PPP(); pppsetLocalAddress(new byte[] {(byte) 192, (byte) 168, 1, 1}); pppsetRemoteAddress(new byte[] {(byte) 192, (byte) 168, 1, 2}); pppsetAuthenticate(true); } public void dataLinkError(String error) { Systemerrprintln("Error in data link:"+error); pppclose(); } }
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After initializing the listener and maxRetries elds, PPPDaemon s constructor creates an object to manage the physical data link It creates either a PPPSerialLink or a PPPModemLink object, depending on the modemLink boolean
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