import serial
#=======opening ports============#
ser = False
while(not ser):
    ser = input("please enter port number:\t")
    try:
        ser = serial.Serial(int(ser)-1)
    except:
        ser = False
        print("you entered invalid port number\nplease enter corract port number(usually 8)")
    
print("working on serial port \"" + ser.name + "\"")

#=======preparing data============#
number = string(input("enter phone number:\n"))
message = string(input("enter message:\n")
#=======monitor============#
ser.write(number.encode())
ser.write('\r'.encode())

ser.write(message.encode())
ser.write('\r'.encode())
while True:
    a=ser.readline().strip()
    print(a)