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I have a GSM modem and send ussd command to it and wait for a response from that. all operation are correct when GSM modem response in lower than 5 second. but when the response is higher than 5 second i received +cusd:4 error from modem. any idea for that?(Modem is D-Link DWM-156 3G HSUPA USB Adapter)

Mahdi_Nine
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1 Answers1

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You should change the timestamp in your connection to the modem (on C#). I don't know how you establish your connection but I had the same problem in Python... changed the timestamp and it worked just fine.

Good luck

typiax
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