Fix for #3460 issue (#4424)

Fixes: #3460

This code has been run in production for 1 month and it looks stable, no data dropped and it definitely fixes the issue described. I think that this can be merged to avoid using custom package referencing in PlatformIO that has been used in quite a few projects for now.

Co-authored-by: Ivan Golubic <ivan@mvt-solutions.com>

Author: igolubic

libraries/WiFiClientSecure/src/ssl_client.cpp

@@ -284,24 +284,21 @@ int data_to_read(sslclient_context *ssl_client)
     return res;
 }
 
-
 int send_ssl_data(sslclient_context *ssl_client, const uint8_t *data, uint16_t len)
 {
-    log_v("Writing HTTP request...");  //for low level debug
+    log_v("Writing HTTP request with %d bytes...", len); //for low level debug
     int ret = -1;
 
-    while ((ret = mbedtls_ssl_write(&ssl_client->ssl_ctx, data, len)) <= 0) {
-        if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
-            return handle_error(ret);
-        }
+    if ((ret = mbedtls_ssl_write(&ssl_client->ssl_ctx, data, len)) <= 0){
+        log_v("Handling error %d", ret); //for low level debug
+        return handle_error(ret);
+    } else{
+        log_v("Returning with %d bytes written", ret); //for low level debug
     }
 
-    len = ret;
-    //log_v("%d bytes written", len);  //for low level debug
     return ret;
 }
 
-
 int get_ssl_receive(sslclient_context *ssl_client, uint8_t *data, int length)
 {
     //log_d( "Reading HTTP response...");   //for low level debug