Common AT command Introduction

command

Introduction

AT+CNMP=?

Preferred network mode selection

Parameters <mode> 2 Automatic 13 GSM only 38 LTE only 51 GSM and LTE only

AT+CNMP=2 indicates automatic network-searching mode. AT+CNMP=13

indicates only use GSM. AT+CNMP=38 indicates use compound “CAT-

M1+NBIoT”. AT+CNMP=51 indicates use compound “GSM+CAT-M1+NBIoT”.

AT+CMNB=?

Preferred LTE network mode selection

Parameters <mode> 1 CAT-M 2 NB-Iot 3 CAT-M and NB-IoT AT+CMNB=1 means

set to CAT-M1 mode AT+CMNB=2 means set to NBIoT mode AT+CMNB=3

means set to compound CAT-M1 + NBIoT mode

AT+CSQ

Signal quality report

Parameters <rssi> 0 -115 dBm or less 1 -111 dBm 2...30 -110... -54 dBm 31 -52 dBm

or greater 99 not known or not detectable <ber> (in percent): 0...7 As RXQUAL

values in the table in GSM 05.08 [20] subclause 7.2.4 99 Not known or not detectable

AT+CGATT?

Attach or detach from GPRS service

Parameters <state> Indicates the state of GPRS attachment 0 Detached 1 Attached

Other values are reserved and will result in an ERROR response to the Write

Command.

AT+CSTT

Start task and set APN, user name, password

AT+CIFSR

Get local IP address

AT+CIPSTART="ptl","host","port"

Start up TCP or UDP connection

<host>: connection domain name to input concrete domain name or IP address.

<port> Remote server port

AT+CIPSEND="len"

Send data

Len: data length , input date to be sent after return”>”.

AT+CIPCLOSE

Close TCP or UDP Connection

AT+CIPSHUT

Deactivate GPRS PDP Context