Sim7600 Tracker

This project uses a Feather M0 microcontroller and a SIMCOM7600 LTE Glonass Module as a tracking device

SMS Config

One of the features of this project is that you can set configuration parameters on the go by SMS

Sample message	Description
#*, server, http://iotnetwork.com.au:5055/,	Server and port configuration
#*, stationary, 300,	Period in seconds to save location if speed < 1
#*, logging, 20,	Period in seconds to save location if speed >= 1
#*, upload, 300,	Period in seconds to upload location saved
#*, recovery, 1,	When set recovery to 1, the device will send its location to server every 10 segs
#*, recovery, 0,	Disable revocery mode and return to normal working code
#*, sms, +00987654321,	Send SMS from tracker to especified number with location data, include country code(Ex. +00)

The commands are character sensible so dont include blank spaces and dont forget to type all the ", " (commas) shown on the sample message

Modem with LTE and GPS/Glonass/Beidou features Aliexpress

The commands provided by SIMCOM can be found here Application note

This are the commands required for TCP/IP connections, this is not required for this modem model

You can make a POST/GET request with the followin set of commands

Command	Response	Description
AT+HTTPINIT	OK	Init HTTP service
AT+HTTPPARA="CID", 1	OK	Set parameters for HTTP session
AT+HTTPPARA="URL", "www.sim.com"	OK	Set parameters for HTTP session
AT+HTTPACTION=0	OK / +HTTPACTION: 0, 200, 1000	GET session start / GET successfully
AT+HTTPREAD	+HTTPREAD: 1000 / OK	Read the data of HTTP server
AT+HTTPTERM	OK	Terminate HTTP service

On this especific module the GPS features are already enabled from boot, you can get the related documentation here Application Note

Command	Response	Description
AT+CGPS=1, 1 / AT+CGPS=1 / AT+CGPSCOLD / AT+CGPSHOT	OK	Start GPS stand alone
AT+CGNSSINFO	+CGNSSINFO: 2, 06, 03, 00, 3426.693019, S, 15051.184731, E, 170521, 034216.0, 46.5, 0.0, 0.0, 1.2, 0.9, 0.9
GNSS Data

Value	Tag	Description
2		Fix mode 2=2D fix 3=3D fix
06		GPS satellite valid numbers scope: 00-12
03		GLONASS satellite valid numbers scope: 00-12
00		BEIDOU satellite valid numbers scope: 00-12
3426.693019		Latitude of current position. Output format is ddmm.mmmmmm
S	<N/S>	N/S Indicator, N=north or S=south
15051.184731		Longitude of current position. Output format is dddmm.mmmmmm
E	<E/W>	E/W Indicator, E=east or W=west
170521		Date. Output format is ddmmyy
034216.0		UTC Time. Output format is hhmmss.s
46.5		MSL Altitude. Unit is meters.
0.0		Speed Over Ground. Unit is knots.
0.0		Course. Degrees.
1.2		Position Dilution Of Precision.
0.9		Horizontal Dilution Of Precision.
0.9		Vertical Dilution Of Precision

In order to get SMS we need to use the following set of commands, AT commands reference

Command	Response	Description
AT+CSMS=0	OK	Select SMS service
AT+CPMS="ME", "ME", "ME"	OK	Select SMS storage
AT+CMGF=1	OK	Select SMS text format
AT+CNMI=2, 2	OK	Show SMS notification when it comes
+CMT: "+61419847400", "", "21/06/21, 13:23:10+40"		SMS Notification, location, index
Testing SMS commands		SMS Notification, location, index
AT+CMGRD=0	OK	Read and Delete SMS
AT+CNMA	OK	Send ACK to SMS sender
AT+CGNSSINFO	(*) +CGNSSINFO: 2...	GNSS Data

(*) +CGNSSINFO: 2, 06, 03, 00, 3426.693019, S, 15051.184731, E, 170521, 034216.0, 46.5, 0.0, 0.0, 1.2, 0.9, 0.9

To disable RF features when they are not required we can use the following set of codes SIM7600 Series PCIE Hardware Design

Command	Response	Description
AT+CFUN=1	OK	Enable RF
AT+CFUN=0	OK	Disable RF

The full list of commands can be found here: AT commands reference some additional commands used on this project are descrived bellow

More information about the modem can be found here: Hardware Design