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AT^SIST always returns "Operation not allowed" | Telit Cinterion IoT Developer Community

December 2, 2014 - 3:58am, 3705 views

Hello Everyone,

I'm a beginner user with Gemalto EHS8. By using AT commands I can connect to my TCP server in non-transparent mode! Sending and receiving data is OK! But when I follow the instractions on the datasheet to go to the transparent mode on the AT^SIST = 2 , I always receive "operationb not allowed" erroe message! The AT commands I have issued and received error is as bellow :

AT^SISC = 0, conType, gprs0 -> OK

AT^SISC = 0,apn,internet ->OK

AT^SCFG = "TCP/WithURCs","off" -> ^SCFG: "Tcp/WithURCs","off" OK

AT^SISS=2,srvType,"Socket" -> OK

AT^SISS=2,conId,0 -> OK

AT^SISS=2,address,"socktcp://***.yyy.zzz.ttt:ppppp;ext;timer=200" -> OK


waiting for connection establishment. After connection establishment ...

AT^SIST=2 -> Error

Please kindly let me know if you know what is the problem here!

Thanks ^_^