Migration to Arduino Core 3.x about esp_atmod HOT 4 OPEN

I use 3.0.2. I don't use SSL connection so I can't comment about that part.

I was expecting problems with automatic joining AP at start, because I know it is off by default in 3.0+, but they didn't occur. I assumed because of how WiFiEspAT library's SetupPersistentWiFiConnection example, which I use for it, works. And I hade to run it multiple times as I switched between normal AT firmware and ESP_ATMod to compare results.

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2. Bad AT+CIPSTATUS (reply +CIPSTATUS:2,"SSL","(IP unset)",0,0,0) after connecting to and transferring data from web server.

The problem is in the core. I have reported it.

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With the update of core to 3.1 problems appeared:

error: use of deleted function 'BearSSL::X509List& BearSSL::X509List::operator=(const BearSSL::X509List&)'

warning: 'WiFiClient WiFiServer::available(uint8_t*)' is deprecated: Renamed to accept(). [-Wdeprecated-declarations]

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the warning is expected. I made the 'rename' of server.available() to accept() in the ESP8266WiFi library. but it is just a warning

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