import machine
import utime

sim800l = machine.UART(1, baudrate=115200, tx=8, rx=9, timeout=10000)
import re

resCodes = ['OK', 'ERROR']
def resComplete(line):
    if any(element in line for element in resCodes):
        return True
    return False

def getCommand(string):
    resPattern = re.compile(r'+(\w+)')
    cmd = resPattern.search(line).match
    return cmd

def awaitResF(line, cmd):
    if cmd in line:
        return True
    return False

def send_at_command(command, awaitRes=False):
    sim800l.write(command + b'\r\n')
    sim800l.flush() #wait until command is sent

    cmd = getCommand(command)

    response = b''
    newLine = ''
    while not resComplete(newLine) and (not awaitRes or awaitResF(newLine, cmd)):
        newLine = sim800l.readline()
        if newLine == None:
            #The machine took too long to respond
            #You can set the timeout time in the sim800 constructor - machine.uart(1, baudrate=..., tx=..., rx=..., timeout=...) in ms
            print("RESPONSE TIMED OUT")
            return
        response += newLine

    print('cmd :', command, 'res :', response.decode( 'utf-8').strip(), '\n----')

send_at_command(b'AT+CMEE=2')
send_at_command(b'AT+CFUN=1')
send_at_command(b'AT+CPIN=7575', True)
send_at_command(b'AT+CREG?')
send_at_command(b'AT+CGATT?')
send_at_command(b'AT+CGATT=1')
send_at_command(b'AT+CSTT=?')
send_at_command(b'AT+CSTT=internet.tele2.lv')
send_at_command(b'AT+CIICR')
send_at_command(b'AT+CSQ')