Hello, I have a board with a EG915U-EU module. I am trying to make a TCP connection to our server and receive this error: “+CME ERROR: invalid command line”
Here is a log of some command sequence:
AT
OK
AT+CPIN?
+CPIN: READY
OK
AT+CSQ
+CSQ: 17,99
OK
ATI
Quectel
EG915U
Revision: EG915UEUABR03A21M08_OCPU_QPY
OK
AT+CFUN=1
OK
AT+CGATT=1
OK
AT+CGDCONT=1,“IP”,“internet”
+CME ERROR: Operation not allowed
AT+QIOPEN=“TCP”,“xx.xx.xx.xx”,9003 (Real IP edited)
+CME ERROR: invalid command line
Also, this firmware revision ( EG915UEUABR03A21M08_OCPU_QPY ) seems to be an open cpu version.
The questions are: Is this actually an open CPU firmware? If yes, is this the reason many AT commands are not supported? Is there a different way to set a TCP connection? If not, why does this happen and how to solve it?
I am new to Quectel and don’t know what makes the module Open CPU, if its just the firmware or the Hardware or both. If its a firmware only feature, I would like to have the latest firmware of both Open CPU and not open CPU versions, so I could switch versions to test different applications.
Thank you in advance
I am attaching a picture of the module
Thank you for your reply.
Here is the log. All commands starting with AT+QIxxx are not recognized
AT
OK
ATI
Quectel
EG915U
Revision: EG915UEUABR03A21M08_OCPU_QPY
OK
AT+CPIN?
+CPIN: READY
OK
AT+CSQ
+CSQ: 17,99
OK
AT+CFUN?
+CFUN: 1
OK
AT+CFUN=4
OK
AT+CGDCONT=1,“IP”,“internet”
OK
AT+CFUN=1
OK
AT+CGATT=1
OK
AT+QIOPEN=?
+CME ERROR: invalid command line
AT+QIOPEN=“TCP”,“xx.xx.xx.xx”,9003
+CME ERROR: invalid command line
If I don’t set back AT+CFUN=1 before AT+CGATT=1, this happen:
AT
OK
ATI
Quectel
EG915U
Revision: EG915UEUABR03A21M08_OCPU_QPY
OK
AT+CPIN?
+CPIN: READY
OK
AT+CSQ
+CSQ: 19,99
OK
AT+CGSN
866344051041916
OK
AT+CFUN?
+CFUN: 1
OK
AT+CFUN=4
OK
AT+CGATT=1
+CME ERROR: Operation not allowed
AT+CGDCONT=1,“IP”,“internet”
OK
AT+QIOPEN=“TCP”,“xx.xx.xx.xx”,9003
+CME ERROR: invalid command line
