WiFi static IP configuration doesn't work after networking refactoring

[JAndrassy]

Description

WiFi doesn't use static IP configuration after the networking refactoring. Settings are not applied in NetworkInterface.config because esp_netif is NULL. In begin then DHCP is used.

arduino-esp32/libraries/Network/src/NetworkInterface.cpp

Line 330 in 7b29bac

if(_esp_netif == NULL){

Sketch

WiFiClientStaticIP example

---

If I first begin with DHCP then setting static IP works for next begin. But following begin again uses DHCP. This is not right. Already configured static IP configuration has to be used. Static IP should be only cleared with config(INADDR_NONE) (or end()). All WiFi libraries have it that way including the esp8266 WiFi.
The static IP configuration is cleared because ESP_NETIF_HAS_IP_BIT is cleared so config() with default parameters in invoked.

arduino-esp32/libraries/WiFi/src/STA.cpp

Line 354 in 7b29bac

if((getStatusBits() & ESP_NETIF_HAS_IP_BIT) == 0 && !config()){

.

[me-no-dev]

@JAndrassy please try #9445

[JAndrassy]

second begin with static IP doesn't connect to WiFi. output from my test:

Attempting to connect to SSID "M20" with static IP 192.168.1.177
.
	...success

MAC: 30:AE:A4:08:B2:70
SSID: M20
BSSID: C0:25:E9:C3:2F:8A
RSSI:-56 dBm
IP Address: 192.168.1.177
gateway IP Address: 192.168.1.1
subnet IP mask: 255.255.255.0
DNS server: 192.168.1.1

Attempt to connect to port 80 on 192.168.1.1
	...success

[  2890][W][STA.cpp:157] _onStaArduinoEvent(): Reason: 8 - ASSOC_LEAVE
Attempting to connect without resetting static IP configuration

	...success

MAC: 30:AE:A4:08:B2:70
SSID: 
BSSID: 00:00:00:00:00:00
RSSI:0 dBm
IP Address: 192.168.1.177
gateway IP Address: 192.168.1.1
subnet IP mask: 255.255.255.0
DNS server: 192.168.1.1
DNS server2: 8.8.8.8

Attempt to connect to port 80 on 192.168.1.1
[  2923][E][NetworkClient.cpp:258] connect(): connect on fd 48, errno: 118, "Host is unreachable"
	...ERROR

[  2937][W][STA.cpp:548] disconnect(): STA already disconnected.

[me-no-dev]

enable verbose debug please. Not sure what I am looking at, but here I ran a constant loop of connect, wait 10 seconds, disconnect, wait 5 seconds, repeat. Static IP was kept the same and was able to reconnect to the same AP just fine. Anyway, your IP is there just fine.

[JAndrassy]

there is nothing in verbose log for the second begin with static IP. I will debug it now to find out where it fails

[JAndrassy]

sorry. I can't replicate it. then it happened on the first and second try. now it works. In many attempts it sometimes doesn't connect to AP in different parts of the test, but that could be a problem of my AP.

so the PR is OK and the problem is solved