We use EG912 module in a project with internal TCP/IP stack. We have no ack mechanism in application layer so we need to check TCP ACK received. When we don’t use TLS we can check with AT+QISEND=sock_id,0 command; how much data sent and how much got ACK. But when we use TLS with AT+QSSLSEND=sock_id,0 we got error. How can we check ACK’ed data with TLS?