Remove deadlock when server is not acking our data

libraries/ESP8266WiFi/src/WiFiClientSecureBearSSL.cpp

@@ -1009,6 +1009,9 @@ bool WiFiClientSecure::_connectSSL(const char* hostName) {
   _x509_insecure = nullptr;
   _x509_knownkey = nullptr;
 
+  // reduce timeout after successful handshake to fail fast if server stop accepting our data for whathever reason
+  if (ret) _timeout = 5000;
+
   return ret;
 }
 

libraries/ESP8266WiFi/src/include/ClientContext.h

@@ -456,7 +456,7 @@ class ClientContext
             }
 
             _send_waiting = true;
-            esp_yield();
+            delay(_timeout_ms);
         } while(true);
         _send_waiting = false;