SIM7070G Global NB-IoT Module: AT Command Handbook

The AT Command Handbook is a comprehensive guide to utilizing AT commands for device control and network management, offering detailed explanations of common commands, MQTT connectivity, GNSS positioning, HTTP(S) routines, and function modes, aimed at efficient operation and problem-solving.

Common AT Commands

Command	Meaning	Return Value
AT	AT test command	OK
ATE	ATE1 sets echo, ATE0 turns off echo	OK
AT+CGMI	Query module manufacturer	OK
AT+CGMM	Query module model identifier	OK
AT+CGSN	Query product serial number	OK
AT+CGMR	Query software version serial number	OK
AT+IPR=9600	Set module temporary hardware serial port baud rate to 9600	OK
AT+IPR?	Query current hardware serial port baud rate	OK
AT+CPIN?	Query SIM card status, return READY, indicating that the SIM card can be recognized normally	OK
AT+CSQ	Network signal quality query, return signal value	OK
AT+CGREG?	Check network registration	OK
AT+CMEE=1	Report mobile device error	OK
AT+CGNAPN	Get network APN in CAT-M or NB-IOT	OK
AT+CPSI?	Query UE system information	OK
AT+CNACT=0,1	Activate application network	OK
AT+CNACT?	Query network IP	OK
AT+CNACT=0,0	Close application network	OK
AT+CNMP=38	Select LTE mode	OK
AT+CMNB=2	Select NB network	OK
AT+CPOWD=1	Shutdown	NORMAL POWER DOWN

Note: Please refer to the AT instruction set for more test commands

MQTT Connection AT Commands

Command	Meaning	Return Value
AT+CNACT=0,1	Activate application network	OK
AT+CNACT?	Query network IP	OK
AT+SMCONF	Set MQTT parameters	OK
AT+SMCONN	Start MQTT connection	OK
AT+SMPUB	Push topic message	OK
AT+SMSUB	Subscribe to topic	OK
AT+SMUNSUB	Unsubscribe from topic	OK
AT+SMSTATE	Query MQTT connection status	OK
AT+SMPUBHEX	Push HEX type topic message	OK
AT+SMDISC	Disconnect MQTT connection	OK
AT+CNACT=0,0	Disconnect application connection	OK

GNSS Positioning AT Commands

Command	Meaning	Return Value
AT+CGNSPWR	GNSS power control	OK
AT+CGNSINF	GNSS navigation information parsed from NMEA sentence	OK
AT+CGNSCOLD	GNSS cold start	OK
AT+CGNSWARM	GNSS warm start	OK
AT+CGNSHOT	GNSS hot start	OK
AT+CGNSMOD	GNSS working mode setting	OK
AT+CGNSXTRA	Open GNSS XTRA	OK
AT+CGNSCPY	Copy GNSS XTRA file	OK
AT+SGNSCFG	GNSS NMEA output configuration	OK
AT+SGNSCMD	AT serial port output GNSS NMEA data	OK

Note: There are three ways to start GNSS: cold start, warm start, and hot start.

Cold start: When GNSS starts in a brand new environment and needs to re-acquire all satellite information. It is usually used for first use, battery exhaustion, or large device movement. In this case, the startup time is longer.
Warm start: This is when GNSS starts again more than 2 hours after the last positioning. At this time, some satellite information has changed and needs to be updated. The startup time is between cold start and hot start, suitable for restarting after temporary shutdown of the device.
Hot start: This is when GNSS starts again within a short time (within 2 hours). The device's position has not changed much, most of the satellite information is still valid, the startup time is the shortest, suitable for frequent startups within a short time.

HTTP(S) Routine AT Commands

Command	Meaning	Return Value
AT+CSSLCFG	Configure SSL parameters for context identifier	OK
AT+SHCONF	Set HTTP(S) parameters	OK
AT+SHSSL	Select SSL configuration	OK
AT+SHCONN	HTTP(S) connection	OK
AT+SHBOD	Set Body	OK
AT+SHAHEAD	Add Head	OK
AT+SHPARA	Set HTTP(S) Para	OK
AT+SHCPARA	Clear HTTP(S) Para	OK
AT+SHCHEAD	Clear Head	OK
AT+SHSTATE	Query HTTP(S) connection status	OK
AT+SHREQ	Set request type	OK
AT+SHREAD	Read response value	OK
AT+SHDISC	Disconnect HTTP(S)	OK
AT+HTTPTOFS	Download file to ap file system	OK
AT+HTTPTOFSRL	Status of downloading file to ap file system	OK

Function Mode AT Commands

Command	Meaning	Return Value
AT+CFUN=0	Minimum function mode	OK
AT+CFUN=1	Full function mode (default)	OK
AT+CFUN=4	Flight mode	OK

Note:

After setting "AT+CFUN=0", the module enters the minimum function mode, turns off the radio frequency function and SIM card function. In this case, the serial port and USB can still be used, but the functions related to radio frequency and SIM card and some AT commands cannot be used.
After setting "AT+CFUN=4", the module enters flight mode and turns off the radio frequency function. In this case, the module's serial port and USB can still be used, but the functions related to radio frequency and some AT commands cannot be used.
When the module enters the minimum function mode or enters the flight mode, it can return to the full function mode by the command "AT+CFUN=1".