A simple and easy to use NodeJS API to communicate with serial GSM Modems.

• Read device information: serial, manufacturer, model.
• Read network information: Carrier, signal strength, subscriber id.
• Read and send SMS Messages.
• Add, Read and modify SIM card contacts.
• Make calls (without audio).

• Connected USB GSM Modem
• Working SIM Card
• NodeJS 11 and later

npm install nodegsm

const GSM = require("nodegsm")
const gsm = new GSM("/dev/gsmmodem")
await gsm.connect()

const manufacturer = await gsm.getManufacturerInformation()) 
console.log(manufacturer) // QUALCOMM INCORPORATED

const unreadMessages = await gsm.readSMS(GSM.MessageStorage.sim, GSM.MessageFilter.unread)
console.log(unreadMessages) // List of unread SMS messages

await gsm.sendSMS("+31111222333","Hello from NodeJS")

• serialport

• Send and Receive SMS Messages Using Raspberry Pi and Python
• AT Commands Reference Guide (Local Copy)
• Introduction to AT commands and its uses

Terminal window 1 will read

$ cat /dev/gsmmodem

OK

Manufacturer: QUALCOMM INCORPORATED
Model: +CGMM:HSPA MODEM
Revision: +CGMR:V1.2
IMEI: 869478036086138
+GCAP: +CGSM,+DS,+ES

OK

Terminal window 2 will write

$ echo "AT" > /dev/gsmmodem
$ echo "ATI" > /dev/gsmmodem

$ apt install cu
$ cu -l /dev/gsmmodem

AT

OK

ATI

Manufacturer: QUALCOMM INCORPORATED
Model: +CGMM:HSPA MODEM
Revision: +CGMR:V1.2
IMEI: 869478036086138
+GCAP: +CGSM,+DS,+ES

OK