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Fix support for following redirects added by ee88c42c (#4240) (#4385)

* fix typos

* made return value description a bit more helpful

* Updated Readme.md

Added links to latest release. Made it look a lot cleaner.

* Update README.md

I met problem while I was working with the WiFiClientSecure.
I tried to found the source of the problem, and I found it in the sll_client.cpp.
Please check my contribution.

I've open this problem in #4335 but received no response.

Please add OpenKB Board Product from INEX Co. Ltd.

https://inex.co.th/shop/openkb.html

I spent quite a while today figuring out how to get an OTA update over HTTPS on a custom port working. A part of my problem was not putting a slash before the .bin filename, since it wasn't there in the example. This produced invalid HTTP requests. Adding the slash would make it clear that it needs to be there.

Given that the URL in line 53 contains the same words "server" and "file.bin", one might assume that in line 55, the slash after the port number would get added automatically, however I have found out that without a slash you get an invalid request. Adding the slash removes any doubt.

Add a new Dev Board S.ODI Ultra v1 in esp32 library

* HttpsOTAUpdate introduced new IDF component requirements.
These have been added to CMakeLists.txt to correct compilation errors when using Cmake.

I was playing with the mDNS service and noticed the method MDNSResponder::addService could return a Boolean with the way it is implemented just like other functions in this library.

This would be handy to know at a higher level weather or not the service was added correctly to the mDNS server of the ESP32.

This is a fix for missing scan responses after a first successfull scan.

While running the BLE_scan.ino sketch with wantDuplicates=false, i got
only one result with correct advertising and scan response length (31,26):

pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks(), false);
pBLEScan->start(scanTime, false);
...
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1

All following calls to start() just returned the advertising data without
scan response data:

pBLEScan->start(scanTime, false);
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1

With "wantDuplicates=true" i got:

pBLEScan->setAdvertisedDeviceCallbacks(new MyAdvertisedDeviceCallbacks(), true);
pBLEScan->start(scanTime, false);
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 26, addr type: 1
[W][BLEScan.cpp:73] handleGAPEvent(): ESP_GAP_SEARCH_INQ_CMPL_EVT
Devices found: 1
Scan done!
pBLEScan->start(scanTime, false);
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 0 + 26, addr type: 1
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 31 + 0, addr type: 1
[W][BLEScan.cpp:109] handleGAPEvent(): bytes length: 0 + 26, addr type: 1

Explicitly initializing m_scan_params.scan_duplicate of BLEScan solves
this issue (In my case the un-initialized value was
m_scan_params.scan_duplicate == 1073599044).
Co-authored-by: Me No Dev <me-no-dev@users.noreply.github.com>

* If WebServer.handleClient is run in a tight loop, it will starve other processes.  So, if there is no connection, throw in a delay(1).  Fixes #4348

* Made a variable to control the delay behavior

Fixes crash on ESP32 when I2C FiFo overflows and interrupt function is unable to handle crash and throws this error:
[E][esp32-hal-i2c.c:1013] i2c_isr_handler_default(): unknown int=4
Co-authored-by: 0xDEADBEEF <0xde4dbeef@gmail.com>

G22 was defined twice, changing the first one to G21

MD5 cleanup on begin
Typos

* add m5stack-core2 board

shallow clone (board and submodules) to make installation faster

Source: https://wiki.dfrobot.com/FireBeetle_ESP32_IOT_Microcontroller(V3.0)__Supports_Wi-Fi_&_Bluetooth__SKU__DFR0478

Change name esp8266 for esp32 in welcome message

* Update Parsing.cpp

When uploading TLS cert files the end of file "-----END CERTIFICATE-----" (or any kind of file with the sequence "CRLF--") is taken as posible end boundary. Then it is compared to the start boundary string. As it is expected, comparison turns to be false, and the whole end boundary string is put to _currentUpload->buf through _uploadWriteByte(). Here you have the problem: if you read boundary.length() bytes from HTTP request and you have some of the actual end boundary bytes in it, when you put all those bytes into _currentUpload->buf you are making a mistake. You will miss the actual end boundary string because some of those bytes were put in _currentUpload->buf.

* Update Parsing.cpp

The latest versions of Arduino IDE shifted the responsibility for precompiled libraries support to the core developers, which breaks precompiled library support in esp32 Arduino core. See https://github.com/arduino/ArduinoCore-avr/pull/52 for more details:

```
In this new version of the builder we are not doing any heuristics to find the right spot where the ldflags should be inserted (this was causing many bugs on its own); instead, we fully trust the core makers to add explicit support to precompiled libs.
```

This chage re-enables precompiled library support in the esp32 Arduino core.

SPIFFS causes crashes if you attempt to rmdir. Since there are no true directories in spiffs, this ought to be a noop. It looks like @me-no-dev worked around this by using unlink instead of rmdir, which works in fatfs and doesn't panic spiffs. This behavior is not universal. In order to get littlefs working, it would be good to get this back to conformity. Rather than digging deep into the upstream spiffs, I just check the mountpoint and noop if it is "/spiffs". So, if the user has changed the mountpoint, this will not work, but I think it's a pretty good tradeoff.

This value is uninitialised and as such can be a random (and invalid) value. It's needs to be set per the espressif documentation here:

https://docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/bluetooth/esp_gap_ble.html#_CPPv4N21esp_ble_scan_params_t14scan_duplicateE

This PR sets it to DUPLICATE_DISABLE. Chosen as this is needed to ensure all scan data is populated in the scan callback, per this comment in the IDF:

https://github.com/espressif/esp-idf/blob/master/components/bt/host/bluedroid/stack/btm/btm_ble_gap.c#L3591

"//if scan duplicate is enabled, the adv packet without scan response is allowed to report to higher layer"

We **don't** want it to report to the higher layer (ie BLEScan.cpp) **unless** it has the active scan response.

Seems to resolve #3770 #3677 and possibly others.