#!/usr/bin/python
# -*- coding:utf-8 -*-
import RPi.GPIO as GPIO
import serial
import time

ser = serial.Serial('/dev/ttyS0',115200)
ser.flushInput()


def send_at(command,back,timeout):
    rec_buff = ''
    ser.write((command+'\r\n').encode())
    time.sleep(timeout)
    if ser.inWaiting():
        time.sleep(0.5)#目测是这里之前太快了，导致没来得及读取返回命令
        rec_buff = ser.read(ser.inWaiting())
    if rec_buff != '':
        if back not in rec_buff.decode():
            print(command + ' ERROR')
            print(command + ' back:\t' + rec_buff.decode())
            return 0
        else:
            str_4g=rec_buff.decode()
            print(rec_buff.decode())
            # if len(str_4g)>50:
            #     print(float(str_4g[25:27])+float(str_4g[27:36])/60)
            #     print(float(str_4g[39:42])+float(str_4g[42:51])/60)
            return 1
    else:
        print('4G is not ready')
        return 0
def get_call():
    # AT$QCRMCALL=1,1

    send_at('AT$QCRMCALL=1,1','OK',1)

# 执行程序
try:
    # 进行拨号
    get_call()
except:
    if ser != None:
        ser.close()
if ser != None:
        ser.close()

import serial

class AtCommand:
    def __init__(self):
        self.ser = None

    def open(self, port, rd_timeout=1):
        # Open searil port
        self.ser = serial.Serial(port,115200, timeout=rd_timeout)

    def close(self):
        # Close searil port
        self.ser.close()

    def send_at(self, cmd):
        cmd_ex = cmd + '\r\n'
        print 'Sending ' + cmd + ' ...'
        self.ser.write(cmd_ex)

    def check_at_resp(self, exp_str, max_size=200):
        '''
        It reads AT response and checks if there is any error.
        All AT response string will be returned if no error, otherwise
        None will be returned.
        '''
        ret = self.ser.read_until(exp_str + '\r\n', max_size)
        if not exp_str in ret:
            print "Actual AT response is: ", ret, "\nBut expected response is: ", exp_str
            ret = None
        return ret

    def parse_at_resp(self, targ_str, at_resp):
        '''
        It extracts the line including target string, then return the string after target string
        at the same line.
        None will be returned in case of any error
        '''
        for cur_line in at_resp.split('\r\n'):
            if targ_str in cur_line:
                # Remove leading and trailing whitespace chars and target string
                return cur_line.replace(targ_str, '').strip()
        else:
            return None
if __name__ == "__main__":
    test_at = AtCommand()
    test_at.open('/dev/ttyS0')
    test_at.send_at('AT')
    print test_at.check_at_resp('OK')