SIM7600G-H M.2 4G HAT 在“设置短信模式”处终止 Python 脚本

Question

我已经能够将其设置为连接到网络并使用屏幕和 minicom 命令（例如 AT+CMGS=“************”）发送和接收短信

但是，当运行尝试执行相同操作的 python 脚本（例如 waveshare 演示脚本）时，脚本会在尝试将 7600 设置为短信模式时终止。

有什么想法吗？

import RPi.GPIO as GPIO
import serial
import time

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

phone_number = '**********' #********** change it to the phone number you want to call
text_message = 'www.waveshare.com'
power_key = 6
rec_buff = ''

def send_at(command,back,timeout):
    rec_buff = ''
    ser.write((command+'\r\n').encode())
    time.sleep(timeout)
    if ser.inWaiting():
        time.sleep(0.01 )
        rec_buff = ser.read(ser.inWaiting())
    if back not in rec_buff.decode():
        print(command + ' ERROR')
        print(command + ' back:\t' + rec_buff.decode())
        return 0
    else:
        print(rec_buff.decode())
        return 1

def SendShortMessage(phone_number,text_message):
    
    print("Setting SMS mode...")
    send_at("AT+CMGF=1","OK",1)
    print("Sending Short Message")
    answer = send_at("AT+CMGS=\""+phone_number+"\"",">",2)
    if 1 == answer:
        ser.write(text_message.encode())
        ser.write(b'\x1A')
        answer = send_at('','OK',20)
        if 1 == answer:
            print('send successfully')
        else:
            print('error')
    else:
        print('error%d'%answer)

def ReceiveShortMessage():
    rec_buff = ''
    print('Setting SMS mode...')
    send_at('AT+CMGF=1','OK',1)
    send_at('AT+CPMS=\"SM\",\"SM\",\"SM\"', 'OK', 1)
    answer = send_at('AT+CMGR=1','+CMGR:',2)
    if 1 == answer:
        answer = 0
        if 'OK' in rec_buff:
            answer = 1
            print(rec_buff)
    else:
        print('error%d'%answer)
        return False
    return True

def power_on(power_key):
    print('SIM7600X is starting:')
    GPIO.setmode(GPIO.BCM)
    GPIO.setwarnings(False)
    GPIO.setup(power_key,GPIO.OUT)
    time.sleep(0.1)
    GPIO.output(power_key,GPIO.HIGH)
    time.sleep(2)
    GPIO.output(power_key,GPIO.LOW)
    time.sleep(20)
    ser.flushInput()
    print('SIM7600X is ready')

def power_down(power_key):
    print('SIM7600X is loging off:')
    GPIO.output(power_key,GPIO.HIGH)
    time.sleep(3)
    GPIO.output(power_key,GPIO.LOW)
    time.sleep(18)
    print('Good bye')

try:
    power_on(power_key)
    print('Sending Short Message Test:')
    SendShortMessage(phone_number,text_message)
    print('Receive Short Message Test:\n')
    print('Please send message to phone ' + phone_number)
    ReceiveShortMessage()
    power_down(power_key)
except :
    if ser != None:
        ser.close()
    GPIO.cleanup()

我已经成功连接到4G网络，通过minicom中的直接命令发送和接收短信，例如AT+CMGS="********"。当我尝试使用 python 脚本执行此操作时，脚本在尝试将 7600 设置为 SMS 模式时停止并终止。我已对该文件应用了 777 权限，使用 sudo python3 启动脚本，还打开和关闭了硬件和软件流控制。

Answer 1

没有错误，它只是终止，但我将其范围缩小到以下代码行：

if ser.inWaiting():
        time.sleep(0.01 )
        rec_buff = ser.read(ser.inWaiting())

由于某种原因，它接缝缓冲区中没有等待读取的字节，并且它终止。

有什么想法吗？