fire.py

#!/usr/bin/python
import serial
import RPi.GPIO as GPIO      
import os, time
 
GPIO.setmode(GPIO.BOARD)    
 
# Enable Serial Communication
port = serial.Serial("/dev/ttyUSB3", baudrate=9600, timeout=1)
 
# Transmitting AT Commands to the Modem
# '\r\n' indicates the Enter key
 
port.write('AT'+'\r\n')
rcv = port.read(10)
print rcv
time.sleep(1)
 
port.write('ATE0'+'\r\n')      # Disable the Echo
rcv = port.read(10)
print rcv
time.sleep(1)
 
port.write('AT+CMGF=1'+'\r\n')  # Select Message format as Text mode 
rcv = port.read(10)
print rcv
time.sleep(1)
 
port.write('AT+CNMI=2,1,0,0,0'+'\r\n')   # New SMS Message Indications
rcv = port.read(10)
print rcv
time.sleep(1)
 
# Sending a message to a particular Number
# Eneter your number in place of 1234567890

port.write('AT+CMGS="1234567890"'+'\r\n')
rcv = port.read(10)
print rcv
time.sleep(1)
 
port.write('Emergency Fire Alert Please check sensor log for more info'+'\r\n')  # Message
rcv = port.read(10)
print rcv
 
port.write("\x1A") # Enable to send SMS
for i in range(10):
    rcv = port.read(10)
    print rcv