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TC65 JAVA User's Guide
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12.1.1.2Sending an AT Command to the Device, the send() Method
An AT command is sent to the device by using the send() method. The AT command is sent as a string which must include the finalizing line feed "\r" or the corresponding line end character.
String response = atc.send(“at+cpin?\r”);
/* method returns when the module returns a response */ System.out.println(response);
Possible response printed to System.out:
+CPIN: READY OK
This send function is a blocking call, which means that the calling thread will be interrupted until the module returns a response. The function returns the response, the result code of the AT command, as a string.
Occasionally it may be infeasible to wait for an AT command that requires some time to be processed, such as at+cops?. There is a second,
Note: Using the send methods with strings with incorrect AT command syntax will cause errors.
12.1.1.3Data Connections
If a data connection is created with the ATCommand class, for instance with ‘atd’, an input stream is opened to receive the data from the connection. Similarly, an output stream can be opened to send data on the connection.
/* Please note that this example would not work unless the module had * been initialized and logged into a network. */
System.out.println("Dialing: ATD" + CALLED_NO); response = atc.send("ATD" + CALLED_NO + "\r"); System.out.println("received: " + response);
if (response.indexOf("CONNECT") >= 0) { try {
//We have a data connection, now we do some streaming...
//IOException will be thrown if any of the Stream methods fail OutputStream dataOut = ATCmd.getDataOutputStream(); InputStream dataIn = ATCmd.getDataInputStream();
//out streaming...
dataOut.write(new String("\n\rHello world\n\r").getBytes()); dataOut.write(new String("\n\rThis data was sent by a Java " +
"MIDlet!\n\r").getBytes()); dataOut.write(new String("Press 'Q' to close the " +
"connection\n\r").getBytes());
// ...and in streaming
System.out.println("Waiting for incoming data, currently " + dataIn.available() + " bytes in buffer.");
rcv = 0;
TC65 JAVA User's Guide_V05 | Page 83 of 90 | 26.09.2005 |