Bug: Saving configuration made change in option display

[GregAscolab]

Pb Description

Automatic change in config.json file when saving, change web page option displayed !!!

Configuration

I work on captive portal (Access point), using some default Wifi_SSID and Wifi_PASS for connection.
Not tested in Wifi network mode.

Step to reproduce

1. Load code with no existing file in filesystem.

Autogenerating config.json file :

{
  "wifi-box": "",
  "param-box1": "Mobile Network",
  "PIN code": "",
  "GPRS APN": "iot.1nce.net",
  "GPRS Username": "",
  "GPRS Password": "",
  "param-box6": "ThingsBoard",
  "Device Name": "dev_name",
  "ThingsBoard server address": "thingsboard.cloud",
  "ThingsBoard server port": 80,
  "Provisioning device key": "aaaaaaaaa",
  "Provisioning secret key": "bbbbbbbb",
  "ThingsBoard device token": "",
  "ThingsBoard MQTT server address": "mqtt.thingsboard.cloud",
  "ThingsBoard MQTT server port": 1883,
  "raw-html-ts": "/config/raw-html-ts.htm",
  "raw-javascript-ts": "/config/raw-javascript-ts.js"
}

Associated screens :

Everythings seems OK

2. Change some value in "thingsboard" option tab
   Name = Test_dev_name (fin my example)

3. Click save button

config.json file after saving :

{
  "wifi-box": "",
  "param-box1": "Mobile Network",
  "PIN code": "",
  "GPRS APN": "iot.1nce.net",
  "GPRS Username": "",
  "GPRS Password": "",
  "param-box6": "ThingsBoard",
  "Device Name": "Test_dev_name",
  "ThingsBoard server address": "thingsboard.cloud",
  "ThingsBoard server port": 80,
  "Provisioning device key": "aaaaaa",
  "Provisioning secret key": "bbbbbb",
  "ThingsBoard device token": "",
  "ThingsBoard MQTT server address": "mqtt.thingsboard.cloud",
  "ThingsBoard MQTT server port": 1883,
  "raw-html-ts": "/config/raw-html-ts.htm",
  "raw-javascript-ts": "/config/raw-javascript-ts.js",
  "dhcp": false
}

Please note that the "dhcp" entry appears.

4. Reload "/setup" page (F5 of browser)
   We got these screenshoot :
   Same page except "Thingsboard" tab :
   

PROBLEM: The "dhcp" option appears !!!

5. Go to the "Wifi Setup" option tab

6. Click "manual configuration (no DHCP)" button
   

7. Click "save configuration" button

config.json file after saving :

{
  "wifi-box": "",
  "param-box1": "Mobile Network",
  "ip_address": "undefined",
  "gateway": "undefined",
  "subnet": "undefined",
  "PIN code": "",
  "GPRS APN": "iot.1nce.net",
  "GPRS Username": "",
  "GPRS Password": "",
  "param-box6": "ThingsBoard",
  "Device Name": "Test_dev_name",
  "ThingsBoard server address": "thingsboard.cloud",
  "ThingsBoard server port": 80,
  "Provisioning device key": "aaaaaa",
  "Provisioning secret key": "bbbbbb",
  "ThingsBoard device token": "",
  "ThingsBoard MQTT server address": "mqtt.thingsboard.cloud",
  "ThingsBoard MQTT server port": 1883,
  "raw-html-ts": "/config/raw-html-ts.htm",
  "raw-javascript-ts": "/config/raw-javascript-ts.js",
  "dhcp": true
}

8. Refresh "/setup" page (F5)

PROBLEM : ip address, gateway, subnet appears on "Mobile Network" option tab !!!