Siemens manual TC65 Java Users Guide

TC65 JAVA User's Guide

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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

TC65 JAVA User's Guide_V05 Page 84 of 90 26.09.2005