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Editorial Team
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Asked: 2026-06-10T16:05:17+00:00

Im using SMSlib library to send sms from USB 3G Modem ZTE MF180. I

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Im using SMSlib library to send sms from USB 3G Modem ZTE MF180.
I tried to use SendMessage.java class to test my modem, so I duplicated sms sending code – so in theory I was expecting to get 2 sms.

OutboundNotification outboundNotification = new OutboundNotification();
    SerialModemGateway gateway = new SerialModemGateway("modem.com1", "COM6", 115200, "ZTE", "MF180");        
    gateway.setInbound(true);
    gateway.setOutbound(true);
    gateway.setSimPin("");
    gateway.setSmscNumber("+79037011111");
    Service.getInstance().setOutboundMessageNotification(outboundNotification);
    Service.getInstance().addGateway(gateway);
    Service.getInstance().startService();
    OutboundMessage msg = new OutboundMessage("79213533296", "Hello world!");
    Service.getInstance().sendMessage(msg);
    Service.getInstance().removeGateway(gateway);
    Service.getInstance().stopService();

OutboundNotification outboundNotification2 = new OutboundNotification();

    SerialModemGateway gateway2 = new SerialModemGateway("modem.com1", "COM6", 115200, "ZTE", "MF180");
    gateway2.setInbound(true);
    gateway2.setOutbound(true);
    gateway2.setSimPin("");
    gateway2.setSmscNumber("+79037011111");
    Service.getInstance().setOutboundMessageNotification(outboundNotification2);
    Service.getInstance().addGateway(gateway2);
    Service.getInstance().startService();
    OutboundMessage msg2 = new OutboundMessage("79213533296", "Оповещение о событии ");
    Service.getInstance().sendMessage(msg2);
    Service.getInstance().stopService();

I get the first SMS and then falls exception:

org.smslib.GatewayException: Comm library exception: java.lang.RuntimeException: gnu.io.PortInUseException: org.smslib
It seems, like Service.getInstance().stopService() method doesn’t works. But I dont know what to do.

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1 Answer

  1. Editorial Team

    Your’re trying to create a new SerialModemGateway to the same COM port, which isn’t doable – only one process/service can have a com port open at the same time.

    Make sure you stop the first one before creating another by doing gateway.stopGateway()

    Though you don’t really need to set up and tear down the SerialModemGateway and stop/start the service every time, just create a new message and send it using the existing gateway and service you have opened.

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