diff --git a/tasmota/tasmota_support/support_device_groups.ino b/tasmota/tasmota_support/support_device_groups.ino
index 63b9eb965..35d0b9983 100644
--- a/tasmota/tasmota_support/support_device_groups.ino
+++ b/tasmota/tasmota_support/support_device_groups.ino
@@ -207,8 +207,9 @@ void DeviceGroupsStart()
 
 void DeviceGroupsStop()
 {
+#ifdef ESP8266  
   device_groups_udp.flush();
-#ifdef ESP32
+#else
   device_groups_udp.clear();   // New with core3. Does what flush() did in core2;
 #endif
   device_groups_up = false;
diff --git a/tasmota/tasmota_support/support_udp.ino b/tasmota/tasmota_support/support_udp.ino
index 0cb6c4b75..ffd677a82 100644
--- a/tasmota/tasmota_support/support_udp.ino
+++ b/tasmota/tasmota_support/support_udp.ino
@@ -60,12 +60,11 @@ bool UdpDisconnect(void)
 {
   if (udp_connected) {
     // flush any outgoing packet
-    PortUdp.flush();  // Does nothing in core3
-#ifdef ESP32
-    PortUdp.clear();  // New with core3. Does what flush() did in core2;
-#endif
 #ifdef ESP8266
+    PortUdp.flush();
     UdpCtx.disconnect();
+#else
+    PortUdp.clear();  // New with core3. Does what flush() did in core2;
 #endif
 #ifdef USE_DEVICE_GROUPS
     // stop
@@ -133,7 +132,6 @@ void PollUdp(void)
 
       int32_t len = PortUdp.read(packet_buffer, UDP_BUFFER_SIZE -1);
       packet_buffer[len] = 0;
-//      PortUdp.flush();
       PortUdp.clear();  // New with core3. Does what flush() did in core2;
       AddLog(LOG_LEVEL_DEBUG_MORE, PSTR("UDP: Packet (%d/%d)"), len, pack_len);
 #endif  // ESP32
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_01_9_webserver.ino b/tasmota/tasmota_xdrv_driver/xdrv_01_9_webserver.ino
index de9b796ba..9f8434f32 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_01_9_webserver.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_01_9_webserver.ino
@@ -775,7 +775,11 @@ void WSSend(int code, int ctype, const String& content)
 **********************************************************************************************/
 
 void WSContentBegin(int code, int ctype) {
+#ifdef ESP8266
   Webserver->client().flush();
+#else
+  Webserver->client().clear();  // New with core3. Does what flush() did in core2;
+#endif
   WSHeaderSend();
   Webserver->setContentLength(CONTENT_LENGTH_UNKNOWN);
   WSSend(code, ctype, "");                         // Signal start of chunked content
@@ -3085,7 +3089,7 @@ void HandlePreflightRequest(void)
 // return a simple status page as text/plain code 200
 static void WSReturnSimpleString(const char *msg) {
   if (nullptr == msg) { msg = ""; }
-  Webserver->client().flush();
+  Webserver->client().clear();  // New with core3. Does what flush() did in core2;
   WSHeaderSend();
   Webserver->send(200, "text/plain", msg);
 }
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_04_light_artnet.ino b/tasmota/tasmota_xdrv_driver/xdrv_04_light_artnet.ino
index 342c662f8..076c4a757 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_04_light_artnet.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_04_light_artnet.ino
@@ -245,7 +245,6 @@ void ArtNetLoop(void)
       uint8_t packet_buffer[WS2812_ARTNET_UDP_BUFFER_SIZE];     // buffer to hold incoming UDP/SSDP packet
 
       packet_len = ArtNetUdp->read(packet_buffer, WS2812_ARTNET_UDP_BUFFER_SIZE);
-//      ArtNetUdp->flush();   // Finish reading the current packet
       ArtNetUdp->clear();   // New with core3. Does what flush() did in core2;
 #endif
       // AddLog(LOG_LEVEL_DEBUG_MORE, PSTR("UDP: Packet %*_H (%d)"), 32, packet_buffer, packet_len);
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_10_scripter.ino b/tasmota/tasmota_xdrv_driver/xdrv_10_scripter.ino
index b2316a0f3..6b2a3827b 100755
--- a/tasmota/tasmota_xdrv_driver/xdrv_10_scripter.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_10_scripter.ino
@@ -1386,8 +1386,9 @@ int32_t udp_call(char *url, uint32_t port, char *sbuf) {
   udp.beginPacket(adr, port);
   udp.write((const uint8_t*)sbuf, strlen(sbuf));
   udp.endPacket();
+#ifdef ESP8266
   udp.flush();
-#ifdef ESP32
+#else
   udp.clear();   // New with core3. Does what flush() did in core2;
 #endif
   udp.stop();
@@ -1408,8 +1409,9 @@ void Restart_globvars(void) {
 void Script_Stop_UDP(void) {
   if (!glob_script_mem.udp_flags.udp_used) return;
   if (glob_script_mem.udp_flags.udp_connected) {
+#ifdef ESP8266    
     glob_script_mem.Script_PortUdp.flush();
-#ifdef ESP32
+#else
     glob_script_mem.Script_PortUdp.clear();  // New with core3. Does what flush() did in core2;
 #endif
     glob_script_mem.Script_PortUdp.stop();
@@ -6392,7 +6394,11 @@ void tmod_directModeOutput(uint32_t pin);
           fvar = -1;
           if (glob_script_mem.tcp_server) {
             if (glob_script_mem.tcp_client.connected()) {
+#ifdef ESP8266
               glob_script_mem.tcp_client.flush();
+#else
+              glob_script_mem.tcp_client.clear();
+#endif
               fvar = 0;
             }
           }
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_webserver.ino b/tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_webserver.ino
index 0349736ee..850c53a10 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_webserver.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_52_3_berry_webserver.ino
@@ -184,7 +184,7 @@ extern "C" {
     if (argc >= 2 && be_isint(vm, 1) && be_isstring(vm, 2)) {
       int32_t httpcode = be_toint(vm, 1);
       const char * mimetype = be_tostring(vm, 2);
-      Webserver->client().flush();
+      Webserver->client().clear();  // New with core3. Does what flush() did in core2;
       WSHeaderSend();
       Webserver->setContentLength(CONTENT_LENGTH_UNKNOWN);
       Webserver->send(httpcode, mimetype, "");
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_63_modbus_bridge.ino b/tasmota/tasmota_xdrv_driver/xdrv_63_modbus_bridge.ino
index f3031997b..5be255f3c 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_63_modbus_bridge.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_63_modbus_bridge.ino
@@ -311,7 +311,11 @@ void ModbusBridgeHandle(void)
           client.write(modbusBridge.buffer + 2, 4); // Don't send CRC
           nrOfBytes += 4;
         }
+#ifdef ESP8266
         client.flush();
+#else
+        client.clear();  // New with core3. Does what flush() did in core2;
+#endif        
         AddLog(LOG_LEVEL_DEBUG, PSTR("MBS: MBRTCP from Modbus deviceAddress %d, writing %d bytes to client"), modbusBridge.buffer[0], nrOfBytes);
       }
     }
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_81_esp32_webcam.ino b/tasmota/tasmota_xdrv_driver/xdrv_81_esp32_webcam.ino
index 904e73c84..e9344c328 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_81_esp32_webcam.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_81_esp32_webcam.ino
@@ -884,7 +884,7 @@ void HandleImageBasic(void) {
   }
 
   if (_jpg_buf_len) {
-    Webserver->client().flush();
+    Webserver->client().clear();  // New with core3. Does what flush() did in core2;
     WSHeaderSend();
     Webserver->sendHeader(F("Content-disposition"), F("inline; filename=snapshot.jpg"));
     Webserver->send_P(200, "image/jpeg", (char *)_jpg_buf, _jpg_buf_len);
@@ -925,7 +925,7 @@ void HandleWebcamMjpegTask(void) {
     WcStats.clientfail++;
   }
   if (1 == Wc.stream_active) {
-    Wc.client.flush();
+    Wc.client.clear();  // New with core3. Does what flush() did in core2;
     Wc.client.setTimeout(3);
     AddLog(LOG_LEVEL_DEBUG, PSTR("CAM: Start stream"));
     Wc.client.print("HTTP/1.1 200 OK\r\n"
@@ -990,7 +990,7 @@ void HandleWebcamMjpegTask(void) {
   }
   if (0 == Wc.stream_active) {
     AddLog(LOG_LEVEL_DEBUG, PSTR("CAM: Stream exit"));
-    Wc.client.flush();
+    Wc.client.clear();  // New with core3. Does what flush() did in core2;
     Wc.client.stop();
   }
 }
diff --git a/tasmota/tasmota_xdrv_driver/xdrv_81_esp32_webcam_task.ino b/tasmota/tasmota_xdrv_driver/xdrv_81_esp32_webcam_task.ino
index bf36b2f08..a9f9a3488 100644
--- a/tasmota/tasmota_xdrv_driver/xdrv_81_esp32_webcam_task.ino
+++ b/tasmota/tasmota_xdrv_driver/xdrv_81_esp32_webcam_task.ino
@@ -1888,7 +1888,7 @@ static void WCOperationTask(void *pvParameters){
                       WcStats.clientfail++;
                     }
                     if (1 == client->active) {
-                      client->client.flush();
+                      client->client.clear();  // New with core3. Does what flush() did in core2;
                       client->client.setTimeout(3);
 #ifdef WEBCAM_DEV_DEBUG  
                       AddLog(LOG_LEVEL_DEBUG, PSTR("CAM: Start stream"));
diff --git a/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino b/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
index e33c324d0..a06feeac3 100755
--- a/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
+++ b/tasmota/tasmota_xsns_sensor/xsns_53_sml.ino
@@ -1550,7 +1550,11 @@ void sml_shift_in(uint32_t meters, uint32_t shard) {
             memmove(&mp->sbuff[0], &mp->sbuff[6], mp->sbsiz - 6);
             SML_Decode(meters);
             if (mp->client) {
+#ifdef ESP8266
               mp->client->flush();
+#else
+              mp->client->clear();  // New with core3. Does what flush() did in core2;
+#endif
             }
             //Hexdump(mp->sbuff + 6, 10);
           }