def main():
import os
import sys
import serial
import time

    t = serial.Serial('com7')
    t.write(b'AT\r')
    time.sleep(1)
    t.write(b'AT+CMGF=1\r')
    time.sleep(1)
    t.write(b'AT+CMGS="+79000000000"\r')
    time.sleep(1)
    t.write(bytes('Тест', 'utf-8')+b'\n')
    print (t.read(t.inWaiting()))
    t.write(b'\032')   
    t.close()

if __name__ == '__main__':
    main()

def text2pdu(text):
    res = []
    temp = ''
    for x in text:
        y = hex(ord(x))
        temp += y[2:].zfill(4)
    
    res.append(temp)
    res.append(int(len(res[0])/2))
    return res