WiFiClientSecure: connection timeout not working

[vlastahajek]

When connecting to not responding server/port using WiFiClientSecure , connection timeout is always around 18s.
However, connection timeout works ok for the WiFiClient.

When looking at sources, WiFiClient::connect uses a common non-blocking socket connect pattern for receiving the desired timeout. This is not implemented in the start_ssl_client function used by WiFiClientSecure.

Is there a reason, why connection timeout is not implemented in the start_ssl_client function?

I've tried copy the initial connection pattern from WiFiClient::connect pattern to start_ssl_client and it works ok (unsurprisingly).

Testing code:

#include <WiFiClientSecure.h>

 const char* ssid     = "SSID ";     // your network SSID (name of wifi network)
 const char* password = "password"; // your network password

const char*  server = "www.howsmyssl.com";  // Server URL



void setup() {
  //Initialize serial and wait for port to open:
  Serial.begin(115200);
  delay(100);

  Serial.print("Attempting to connect to SSID: ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);

  // attempt to connect to Wifi network:
  int i = 30;
  while (WiFi.status() != WL_CONNECTED && --i) {
    Serial.print(".");
    // wait 1 second for re-trying
    delay(500);
  }
  if(WiFi.isConnected()) {
    Serial.print("Connected to ");
    Serial.println(ssid);
  } else {
    Serial.println("Connection failed ");
    Serial.println("Restarting.. ");
    ESP.restart();
  }

  WiFiClientSecure secClient;


  secClient.setInsecure();

  Serial.println("\nStarting secure connection to server...");
  uint32_t start = millis();
  int r = secClient.connect(server, 440, 5000);
  Serial.printf("Connection took: %lums\n", millis()-start);
  if(!r) {
    Serial.println("Connection failed!");
  } else {
    Serial.println("Connected!");
    secClient.stop();
  }

  WiFiClient client;
  Serial.println("\nStarting unsecure connection to server...");
  start = millis();
  r = client.connect("192.168.1.3", 500, 3000);
  Serial.printf("Connection took: %lums\n", millis()-start);
  if(!r) {
    Serial.println("Connection failed!");
  } else {
    Serial.println("Connected!");
    client.stop();
  }
}

void loop() {
  // do nothing
}