[SOLVED] Keep automatically searching for connection snap7

Keep automatically searching for connection snap7

We want to autoconnect with the PLC through wifi. When the raspberry is starting up and runs his program automatically. It should be a stand alone raspberry so we don't have a keyboard or anything. We send the data via snap7. This works, but if the wifi is disconnecting I get this error: "ISO: An error occurred during recv TCP: Connection timed out" Sometimes in the beginning of the program we get this error: "Snap7Exception: TCP : Unreachable peer"

My program stops but we should have something so our wifi is reconnected again without stopping the program. I guess we need something to catch our error and use this in a program with a try or something.

My program at this moment:

import snap7
import struct
import time
from snap7.snap7exceptions import Snap7Exception
import re
from ctypes import c_int, c_char_p, byref, sizeof, c_uint16, c_int32, c_byte
from ctypes import c_void_p

client = snap7.client.Client()

db_number = 109

print('Press Ctrl-C to quit.')

while True:

    if client.get_connected() == False: 
        client.connect('192.168.5.2', 0, 1) #('IP-address', rack, slot)
        print('not connected')
        time.sleep(0.2)
    else:
        print('connected')

Solution

In python you can catch errors with the try-except statement.

You can try something along this line:

while True:

    if client.get_connected() == False:
        try:
            client.connect('192.168.5.2', 0, 1) #('IP-address', rack, slot)
            print('not connected')
            time.sleep(0.2)
        except Snap7Exception as e:
            continue
    else:
        print('connected')