EVK-R4 - User guide

UBX-16029216 - R08

Appendix

Page 24 of 31

C1-Public

C Examples of AT commands

For the complete description and syntax of the AT commands supported by SARA-R4 series cellular

modules, see the u-blox SARA-R4 series AT commands manual [1].

For detailed examples of AT commands used for common operations, see the u-blox SARA-R41 series

application development guide [4] and the u-blox SARA-R42 series application development guide [5].

C.1 Data connection using external/internal TCP/IP stack

device automatically establishes a PSD connection as part of the network registration and the

attach procedure.

C.2 Opening a TCP socket

Command sent by DTE (user)

DCE response (module)

Description

AT+CMEE=2

OK

Enables the cellular module to report verbose error result

codes.

AT+CGATT?

+CGATT: 1

OK

Verifies the SARA-R4 module is attached to the network.

AT+CEREG?

+CEREG: 0,1

OK

Verify the network registration status.

AT+COPS=0

OK

Register the module on the network.

The cellular module automatically registers itself on the

cellular network. This command is necessary only if the

automatic registration failed (AT+CEREG? returns 0,0).

AT+COPS?

+COPS: 0,0,"Verizon

Wireless",7

OK

Read the operator name and radio access technology

(RAT).

AT+USOCR=6

+USOCR: 0

OK

Create a TCP socket.

AT+USOCO=0,"195.34.89.241",

7

OK

Connect to the server.

+UUSORD: 0,32

Greeting message.

AT+USORD=0,32

+USORD: 0,32,"u-blox AG

TCP/UDP test service"

OK

Retrieving the message.

AT+USOCL=0

OK

Closing the socket.