Question

我正在使用以下脚本作为家用能源监控系统的基础。该脚本充当连接到串行端口的基于arduino的接收器之间的网关，并将其通过MQTT和http POST传递。该脚本旨在无限期运行。但是，它会随机崩溃，从一个小时到一周不等。我不知道为什么。任何有关如何确定为什么以及如何记录错误的指针将不胜感激。这是脚本：

import time
import datetime
import requests
import paho.mqtt.publish as publish
#import csv
import logging

logging.basicConfig(level=logging.ERROR, filename='serial-read.log', filemode='w', format='%(name)s - %(levelname)s - %(message)s')

device = '/dev/ttyUSB0' #this will have to be changed to the serial port you are using
data = ""
pieces = ""

while True:
    while True:
        try:
            receiver = serial.Serial(device, 57600)
            receiver.flushInput()
        except serial.SerialException:
            print "cannot connect. will try again..."
            time.sleep(10)
        else:
            break
    try:
        data = receiver.readline()
        #print (data)
        #print repr(data)
        #with open ("data_log.csv","a") as f:
            #writer = csv.writer(f,delimiter=",")
            #writer.writerow([time.time(),data])
        pieces = data.split(" ")
        try:
            nodeid = int(pieces[0])
        except ValueError:
            pass
        try:
            data1 = int(pieces[1])
            data2 = int(pieces[2])
            data3 = int(pieces[3])
            data4 = int(pieces[4])
        except IndexError:
            pass
        #print nodeid
        if nodeid == 6:
            #print "Power:"
            Irms = data3 + data4
            print Irms
            localtime = datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
            localtime = "'" + localtime + "'"
            #print localtime
            payload = {"timestamp" : localtime, "Irms" : Irms}
            r = requests.post('http://www.********.ca/*****.php', params=payload)
            #print(r.url)
            publish.single("myHome/energy/power", Irms, hostname="192.168.1.120")
        elif nodeid == 2:
            temp = float(data1)/10
            #print "temp:"
            #print temp
            hum = data3
            publish.single("myHome/garage/temperature", temp, hostname="192.168.1.120")
            publish.single("myHome/garage/humidity", hum, hostname="192.168.1.120")
            temphum = str(temp) + " " + str(hum)
            publish.single("myHome/garage/temphum", temphum, hostname="192.168.1.120")
            #print temphum
    except serial.serialutil.SerialException:
        print "no device connected. Please reconnect device..."
        receiver.close()
        time.sleep(5)

谢谢！

猴面包树

Answer 1

您的第二条try语句捕获以下异常：

except serial.serialutil.SerialException:

但是，如果代码块生成另一个异常怎么办？脚本将退出。与第一个except循环中一样，添加第二个try来捕获其他任何异常，并将它们打印到日志中。

Python脚本由于未知原因随机崩溃

1 个答案: