Siemens TC65, AC65, XT75, XT65 manual Wmjavausersguidev12 116 2008-02-25 Confidential / Released

Java User’s Guide

13.1 Using the AT Command API

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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 break- Connection() 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, except for read functions. The read function case is explained in more detail in Section 13.1.3. 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 Section 13.1.3.

wm_java_usersguide_v12	Page 116 of 123	2008-02-25
Confidential / Released