I am trying to establish a TCP connection using a Q2406B modem.
Sometimes, when I send the AT+WIPBR=4,6,0 command, the response is CME ERROR:811.
This error is described in Error Codes List as “bearer connection failure: sim not ready (no pin code entered,…)”, but I have already entered the pin.
Furthermore, if I send the “AT+CPIN?” command, the response is “+CPIN:READY”, so the pin code has been effectively entered.
Any ideas about the cause of the 811 error cause?
Thanks in advance