Issue title: SmartLife Socket wont stopped SmartConfig complete
 Issue body: I managed to flash 3 of this and one of the refuse to connected after SmartConfig completed.

https://blakadder.github.io/templates/anoopsyche_JH-G01B1.html

I can see there is a WIFI name SMARTLIFE XXXXX  but it just stuck there with no progress. 
Any work around ?

Logs here 

```
==> smarthack-wifi.log <==
Backing up /etc/dnsmasq.conf...
Writing dnsmasq config file...
Creating new /etc/dnsmasq.conf...
Writing hostapd config file...
Configuring AP interface...
Applying iptables rules...
iptables v1.6.0: can't initialize iptables table `filter': Table does not exist                                                                                                  (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
iptables v1.6.0: can't initialize iptables table `nat': Table does not exist (do                                                                                                  you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
iptables v1.6.0: can't initialize iptables table `filter': Table does not exist                                                                                                  (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
iptables v1.6.0: can't initialize iptables table `nat': Table does not exist (do                                                                                                  you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
iptables v1.6.0: can't initialize iptables table `nat': Table does not exist (do                                                                                                  you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
iptables v1.6.0: can't initialize iptables table `filter': Table does not exist                                                                                                  (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.
Starting DNSMASQ server...
RTNETLINK answers: File exists
Starting AP on wlan0 in screen terminal...
Configuration file: /etc/hostapd/hostapd.conf
Failed to create interface mon.wlan0: -95 (Operation not supported)
wlan0: Could not connect to kernel driver
Using interface wlan0 with hwaddr b8:27:eb:c7:21:38 and ssid "vtrust-flash"
wlan0: interface state UNINITIALIZED->ENABLED
wlan0: AP-ENABLED

==> smarthack-web.log <==
Listening on port 80

==> smarthack-mqtt.log <==
1559950126: mosquitto version 1.4.10 (build date Wed, 13 Feb 2019 00:45:38 +0000                                                                                                 ) starting
1559950126: Using default config.
1559950126: Opening ipv4 listen socket on port 1883.
1559950126: Opening ipv6 listen socket on port 1883.


==> smarthack-wifi.log <==
wlan0: STA 24:18:1d:b5:ae:93 IEEE 802.11: associated
wlan0: AP-STA-CONNECTED 24:18:1d:b5:ae:93
wlan0: STA 24:18:1d:b5:ae:93 RADIUS: starting accounting session 155D58F95BAFC86                                                                                                 2
wlan0: STA 24:18:1d:b5:ae:93 WPA: pairwise key handshake completed (RSN)

==> smarthack-smartconfig.log <==
Put Device in Learn Mode! Sending SmartConfig Packets now
Sending SSID                  vtrust-flash
Sending wifiPassword          flashmeifyoucan
SmartConfig in progress
..........
SmartConfig complete.

```


 Comments: 
 Comment 0: Solution keep trying. 

Trick is press the button till the fast blinking start and release immediately. 
{'source': 'GithubIssues', 'repo_name_with_owner': 'ct-Open-Source/tuya-convert', 'issue_id': 453733985, 'repo_stars': 3774.0}