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Asked: 2026-06-06T20:18:39+00:00

I want to know how to execute AT commands inside a J2ME application. The

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I want to know how to execute AT commands inside a J2ME application. The approach that I am taking in brief is as below:

First get all the ports that are present in the phone by

String ports = System.getProperty("microedition.commports");

Now just try to write “AT” and wait for the response from each port (YES I said EACH!!!)

try{
  commConnection = (CommConnection) Connector.open("comm:" + portsArr[i] + ";baudrate=19200");
} catch (IOException e) {
    print("IOException:Port:" + portsArr[i] + "~Mess: " + e.getMessage());
}

Once I get an “OK” from some port I can execute my intended commands in the same way.

I am trying to execute this on two diffrent phones

Nokia SuperNova 7210

ports=USB1

When I try to write to the port nothing happens.

Nokia Xpress music

ports= USB2,COM1,IR1,USB1,BT1,BT2,BT3,BT4,BT5,BT6,BT7,BT8,BT9,BT10,BT11,BT12,BT13,BT14,BT15,BT16,BT17,BT18,BT19,BT20,BT21,BT22,BT23,BT24,BT25,BT26,BT27,BT28,BT29,BT30,BT31,BT32,BT33,BT34,BT35,BT36,BT37,BT38,BT39,BT40,BT41,BT42,BT43,BT44,BT45,BT46,BT47,BT48,BT49,BT50,BT51,BT52,BT53,BT54,BT55,BT56,BT57,BT58,BT59,BT60,BT61,BT62,BT63,BT64

When I try to write to USB2,COM1,BT1 port 

IOException:Port:COM1~Mess: SymbianOS error = -1 : General:
System error
IOException:Port:USB1~Mess: SymbianOS error = -21 : General:
System error
IOException:Port:BT1~Mess: SymbianOS error = -44 : General:
System error

Is this a correct approach?

Smslib uses AT commands but I’m not understanding how do they execute AT commands or how they get the port on which to write the AT commands?

If not possible with J2ME I don’t mind not writing the execution of AT commands in some other language as long as both are able to communicate and the solution will support a most of the vendors.

Related – https://stackoverflow.com/questions/3803508/can-i-use-at-commands-insider-j2me-app

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1 Answer

  1. Editorial Team

    What you are trying to achieve is absolutely not possible.

    Your approach would only work if Java ME provided access to the GSM modem via COMM ports, which it does not!

    (I suppose there could possibly be a device somewhere which offers this, anything’s possible in Java ME land, but I have never seen or heard of this).

    The library you are referring to runs on a PC which has a device connected to it via the COMM port, it does not work in a Java ME context.

    I suspect that what you’re really trying to do is access the handset’s native SMS inbox via a MIDlet. I promise you, there is absolutely no way to do this!

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