micropython-WiFiManager/main.py

import network
import networkconfig
import time

wlan_sta = network.WLAN(network.STA_IF)


def do_connect(ntwrk_ssid, netwrk_pass):
    sta_if = network.WLAN(network.STA_IF)
    sta_if.active(True)
    if not sta_if.isconnected():
        print('try to connect : ' + ntwrk_ssid + ' network...')
        sta_if.connect(ntwrk_ssid, netwrk_pass)
        a = 0
        while not sta_if.isconnected() | (a > 99):
            time.sleep(0.1)
            a += 1
            print('.', end='')
        if sta_if.isconnected():
            print('\nConnected. Network config:', sta_if.ifconfig())
            return (True)
        else:
            print('\nProblem. Not Connected to :' + ntwrk_ssid)
            return (False)


def check_connection():
    global wlan_sta
    # Firstly check is there any connection
    if wlan_sta.isconnected():
        return (True)
    try:
        # connection of ESP to WiFi takes time
        # wait 3 sec. and try again.
        time.sleep(3)
        if not wlan_sta.isconnected():
            # inside passwd file. there are list of WiFi network CSV file
            f = open("passwd.dat")
            data = f.readlines()
            f.close()
            # Search WiFi's in range
            ssids_found = wlan_sta.scan()

            # matching...
            for ipass in data:
                ssid_list = ipass.strip("\n").split(";")

                for i in ssids_found:
                    if ssid_list[0] in i[0]:
                        print("OK. WiFi is Founded")
                        if do_connect(ssid_list[0], ssid_list[1]):
                            return (True)

            if not wlan_sta.isconnected():
                if networkconfig.start():
                    return (True)
        else:
            return (True)

    except OSError:
        # Web server for connection manager
        if networkconfig.start():
            return (True)

    return (False)


if check_connection():

    # Main Code is here
    print("ESP OK")
# to import your code;
# import sample_mqtt.py

else:
    print("There is something wrong")