(not all required, simply listed all related) {Installable via APT / Pacman}
usb-modeswitch gammu modemmanager network-manager gammu-smsd smstools modemmanager libgsmme-dev gnokii picocom minicom ckermit python3-serial
Start by identifying your device and ports with
lsusbcommand:
Example GSM module might look like this:
Bus 001 Device 048: ID 1a86:7523 QinHeng Electronics CH340 serial converter
Then identify bus ID with: ls /dev/ttyUSB*
Example output:
/dev/ttyUSB1
Then you might want to add yourself to dialout group to make syscalls smoother with sudo usermod -aG dialout $USER
Then finally, pick your preffered way of serial communication. (examples below)
(MAKE SURE WHICH BAUD YOU ACTUALLY USING. [DEFAULT: 115200])
Minicom: sudo minicom -D /dev/ttyUSB0
Picocom: sudo picocom -b 9600 /dev/ttyUSB0
Screen: sudo screen /dev/ttyUSB0 115200
Kermit: sudo kermit -> <kermit setup commands>
======= [GENERAL] =======
Reboot:
- AT+CFUN=1,1
Enter PIN: (XXXX is SIM card PIN)
- AT+CPIN="XXXX"
Verify the SIM Status:
- AT+CPIN?
======= [CHECK] =======
Check Network Registration:
(later set mode for each type by changing ? to =X (where X is 0-2))
- AT+CREG? - [GSM]
- AT+CGREG? - [GPRS]
- AT+CEREG? - [LTE]
Check current set service number:
- AT+CSCA?
Check Signal Strength:
- AT+CSQ
Check if registered:
- AT+CREG?
Check network operators: (list all available)
- AT+COPS=?
======= [SET] =======
Set service number:
- AT+CMGS="+491760000443"
- AT+CSCA="+491760000443"
Ensure sms settings are correct:
- AT+CSMS=1
FORCE REGISTER MODULE:
- AT+CREG=1
Set operator manually: (where 26202 is ID of operator)
- AT+COPS=1,2,"26202"
Set network mode to gsm:
- AT+CNMP=13
======= [SMS] =======
Send SMS: (RECEIVERNUMBER is number to receive SMS) (Then when `>`, type a message, and press Ctrl+Z to send it.)
- AT+CMGS="+RECEIVERNUMBER"
Receive SMS: (list ALL messages)
- AT+CMGL="ALL"
Read specific message: (index = number)
- AT+CMGR=index
Delete specific message:
- AT+CMGD=index
======= [CALL] =======
Calling: (replace +XYZ with receiver number)
Dialout:
- ATD+XYZ;
Pick-up call:
- ATA
End the call:
- ATH
(When called, module will show "RING")
IMPORTANT!!! - The SIM800L needs a 2Amp current while searching for the signal. It can run at 3.6v to 4.5v.
Any value outside of this range, will simply not work...
You should see {"CALL READY" "SMS READY.} messages after passing PIN.
If you don't see anything, then make sure module is plugged directly into main USB port, not via extender.
Get to know your SMS service number (can be found deep in android settings)
Example SMS Service Number: [germany] +491760000443]
Also make sure your SIM is configured for your GSM module, shitty cheap modules support only G2, so you have to set it accordingly.
Here's a breakdown of the possible values for +CREG responses:
The response +CREG: 1,0 from the AT+CREG? command indicates the following:
The first number (1) indicates the registration status update is enabled.
The second number (0) indicates that the module is not registered with the network and is not currently searching for a new operator to register to. \
0: Not registered, the module is not currently searching for a new operator.
1: Registered, home network.
2: Not registered, but the module is currently searching for a new operator.
3: Registration denied.
4: Unknown (e.g., out of coverage).
To check current values, do
AT+CREG?&AT+CGREG?. You want to see0,1or0,5
You change values byAT+CREG=X&AT+CGREG=X(where X is allowed value) (0-2)
To see allowed values, doAT+CREG=?
I Highly suggest at least checking each source, they contain waay more info than this tiny handbook