BC66: AT+QSSLCFG=? failing with ERROR response

[rpasichnyk]

I am also having struggle with those commands

BC66 OpenCPU Ql_RIL_SendATCmd CTRL+Z

Some AT commands for BC66 (probably other hardware as well) have this: //Input the content //Tap "CTRL+Z" to send. For example AT+QSSLCFG=1,5,"cacert" I struggle to send such commands using OpenCPU’s function Ql_RIL_SendATCmd Ql_sprintf(cmd, "AT+QSSLCFG=1,5,\"cacert\"); Ql_RIL_SendATCmd(cmd, Ql_strlen(cmd), ATResponse_Handler, nullptr, 0); ATResponse_Handler is not being called and execution blocks. What is the correct way of doing this?