I am developing a software that sends sms and it's waiting for recieving sms using a GSM Modem (USB port that identities as a COM).
I am using ActiveXperts Software SMS MMS Toolkit
It works until sending the first sms. After sending the first sms it can't recieve any more sms but it can still send sms.
If I disconnect the usb cable and re-plug it again it will be ok until sending the first sms.
I don't know what can I do for it. Please help.