IP networking Interfaces User's Guide

TC65 JAVA User's Guide
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TC65 JAVA User's Guide_V05 Page 84 of 90 26.09.2005
while(((char)rcv != 'q') && ((char)rcv != 'Q') && (rcv != -1)){
rcv = dataIn.read();
if (rcv >= 0) {
System.out.print((char)rcv);
}
}
/* The example continues after the next block of text */
In …/Siemens/SMTK/TC65/wtk/src/example a complete data connection example,
DataConnectionDemo.java, can be found.
These streams behave slightly differently than regular data streams. The streams are not
closed by using the close() method. A stream remains open until the release() method is
called. A module can be switched from the data mode to the AT command mode by calling
the breakConnection() method.
/* continue example */
if (rcv != -1) {
// Now break the data connection
System.out.println("\n\n\rBreaking connection");
try {
strRcv = ATCmd.breakConnection();
} catch(Exception e) {
System.out.println(e);
}
System.out.println("received: " + strRcv);
} else {
// Received EOF, somebody else broke the connection
System.out.println("\n\n\rSomebody else switched to " +
"command mode!");
}
System.out.println("Hanging up");
strRcv = ATCmd.send("ATH\r");
System.out.println("received: " + strRcv);
} catch(IOException e) {
System.out.println(e);
}
} else {
System.out.println("No data connection established,");
}
An IOException is thrown if any function of the I/O streams are called when the module is in
AT command mode.
The ATCommand class does not report the result codes returned after data connection
release.
Data Connections are not only used for data transfer over the air but also to access external
hardware. Here is a list of at commands which open a data connection:
• atd, for data calls
• at^sspi, for access to I2C/SPI
• at^sis commands for Internet services
For data connection signaling see also chapter 12.1.3