[MC9090] PAD connection confusion

IoT Modules MC/EM Series
1

Greetings,

I have an issue understanding what a PAD connection does. As far as I know it converts asynchronous data to packets to be transmitted through an X.25 network. Yet, in the AT commands manual, it says I need to use PADsetup to setup a PAD Server/Client:

AT!PADSETUP=<PADprofile>, <conntype>, <addrtype>, <ipaddr>, <localport>, <remoteport>, <autostart>[, <connprofile>]

However, the command needs and IP address & port. So, does this mean, that the MC9090 sends PAD packets over TCP/IP ?

Also, can I connect to a simple TCP/IP server or should it also be running PAD server?

Last but not least, I have a TCP server running and I’m trying to connect to it using PADCONN but I keep on receiving an error:

AT+CGATT=1  
OK

AT+CGATT? 
+CGATT: 1
OK

AT+CGDCONT=1,"IP","internet"  
OK


AT+CGACT=1,1
OK

AT+CGACT?
+CGACT: 1,1
OK

AT+CGREG?   
+CGREG: 0,1
OK

AT!PADSETUP=1,2,0,A.B.C.D,0,PORT,0,1    //TCP/IP Server running on A.B.C.D:PORT
OK


AT!PADCONN=1  
ERROR

Not sure I’m unable to connect to the server. Im able to establish a TCP connection with the server from my PC but not from my embedded computer!
Any help will be very much appreciated!

2

Hi alexjones.

Few weeks ago I posted a very similar question in this forum, because I also have a mc9090 modem and I’d like to connect to a TCP server, but I’m always receiving ERROR like you. Manuals are confusing about PAD commands, but after these weeks racking my brains I think that having a PAD server is mandatory. I hope someone can provide ideas.

Maybe the alternative is QMI, but at this moment I don’t know how to use it.