server crash

#!/usr/bin/env python
# -*- coding: utf-8 -*-
import socket
import os
import threading
import mysql.connector
import time
import datetime
import requests
import sys
#
Dconn = mysql.connector.connect(user='root',password='aaaaa',host='aaaaa',database='aaaa',charset='utf8',autocommit=True)
cursor = Dconn.cursor(buffered=True)
cursor2 = Dconn.cursor(buffered=True)
print('databased stablished.')
def sendData(protocol,server,port,sig):
    print((str(datetime.datetime.now()))+' -> ( '+format(protocol)+' ) '+format(server)+':'+format(port)+' - dbId : '+format(sig[0])+' tId : '+threading.current_thread().name)
    cursor2.execute("select * from raw join devices on devices.dvid=raw.device where raw.rdid='"+format(sig[1])+"' limit 1;")
    sendSig = cursor2.fetchone()
#    print(sendSig)
    timedata = datetime.datetime.fromtimestamp(int(sendSig[12]))
    devimei = sendSig[18]
    devdate = timedata.strftime("%d%m%y")
    devtime = timedata.strftime("%H%M%S")
    lat= format(sendSig[2])
    lon= format(sendSig[3])
    satcount = format(sendSig[5])
    speed = format(sendSig[4])
    batery = format(sendSig[8])
    band = format(sendSig[10])
    if protocol=='tcp':
        try:
            sistr='$MGV002,'+devimei+',12345,S,'+devdate+','+devtime+',A,'+lat+',N,'+lon+',E,0,'+satcount+',00,1.95,'+speed+',0,,,432,35,0,0,5,,,,,,,,,0'+band+','+batery+',Timer;!'
            clientsocket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
            result = clientsocket.connect((server,port))
#            clientsocket.settimeout(4)
            clientsocket.send(sistr)
            data = clientsocket.recv(1024)
            print(str(datetime.datetime.now())+' -> send completed :'+format(sig[0]))
            clientsocket.close()
        except:
            print(str(datetime.datetime.now())+' -> connection to tcp server failed!!')
    elif protocol=='http':
        try:
            sistr='***'+devimei+';123;'+devdate+';'+devtime+';'+lat+';N;'+lon+';E;'+speed+';NA;159;'+satcount+';NA;5;'+batery+';[inputs];[outputs];[adc];[ibutton];[params];***'
            #r = requests.post(server, data={'action': 'update','dev': 'log','ver': '1','val': sistr})
            #r = requests.post(server+'&data='+sistr, data={})
            r = requests.post('http://psimap.ir/WBSRV.php?action=update&dev=log&ver=1&data='+sistr, data={})
            print(str(datetime.datetime.now())+ ' -> Send completed :'+format(sig[0])+' | Response:'+format(r.text))
        except:
            print(str(datetime.datetime.now())+' -> connection to http server failed!!')
    try:
        sqlobject = "UPDATE `row_sent` SET `send_date`=CURRENT_TIMESTAMP WHERE `rsid`='"+format(sig[0])+"' limit 1;"
        cursor2.execute(sqlobject)
    except:
        print(str(datetime.datetime.now())+' -> database rid!!')
        sys.exit(1)
#main
while True:
    cursor.execute("select * from row_sent join servers on servers.sid = row_sent.server_id where result='pending' order by rsid DESC limit 1;")
    if cursor.rowcount>0 :
        waitedSig = cursor.fetchone()
        sqlobject2 = "UPDATE `row_sent` SET `result`='succes' WHERE `rsid`='"+ format(waitedSig[0]) +"' limit 1;"
        cursor.execute(sqlobject2)
        time.sleep(0.2)
        t = threading.Thread(target=sendData , args=((waitedSig[8]),(waitedSig[9]),(waitedSig[10]),(waitedSig),))
        t.start()
        time.sleep(0.5)
    else:
        time.sleep(1)