Fix ESP32 slow response when using UDP as in emulation (#21470)

CHANGELOG.md

@@ -14,6 +14,8 @@ All notable changes to this project will be documented in this file.
 
 ### Fixed
 - Telegram TLS fingerprint, remove CA validation (#21514)
+- ESP32 I2S multiple fixes (#21511)
+- ESP32 slow response when using UDP as in emulation (#21470)
 
 ### Removed
 

RELEASENOTES.md

@@ -149,6 +149,7 @@ The latter links can be used for OTA upgrades too like ``OtaUrl https://ota.tasm
 - Telegram TLS fingerprint, remove CA validation [#21514](https://github.com/arendst/Tasmota/issues/21514)
 - Zigbee crash when removing `ZbName` [#21449](https://github.com/arendst/Tasmota/issues/21449)
 - Avoid connection errors when switching to safeboot to upload OTA firmware [#21428](https://github.com/arendst/Tasmota/issues/21428)
+- ESP32 slow response when using UDP as in emulation [#21470](https://github.com/arendst/Tasmota/issues/21470)
 - ESP32 BLE fix scanning [#21451](https://github.com/arendst/Tasmota/issues/21451)
 - I2S APLL not supported on all SOCs [#21483](https://github.com/arendst/Tasmota/issues/21483)
 - Webradio crash with invalid url [#21446](https://github.com/arendst/Tasmota/issues/21446)

tasmota/tasmota_support/support_udp.ino

@@ -60,7 +60,10 @@ bool UdpDisconnect(void)
 {
   if (udp_connected) {
     // flush any outgoing packet
-    PortUdp.flush();
+    PortUdp.flush();  // Does nothing in core3
+#ifdef ESP32
+    PortUdp.clear();  // New with core3. Does what flush() did in core2;
+#endif
 #ifdef ESP8266
     UdpCtx.disconnect();
 #endif
@@ -130,7 +133,8 @@ void PollUdp(void)
 
       int32_t len = PortUdp.read(packet_buffer, UDP_BUFFER_SIZE -1);
       packet_buffer[len] = 0;
-      PortUdp.flush();
+//      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
 

tasmota/tasmota_xdrv_driver/xdrv_10_scripter.ino

@@ -1406,6 +1406,9 @@ void Script_Stop_UDP(void) {
   if (!glob_script_mem.udp_flags.udp_used) return;
   if (glob_script_mem.udp_flags.udp_connected) {
     glob_script_mem.Script_PortUdp.flush();
+#ifdef ESP32
+    glob_script_mem.Script_PortUdp.clear();  // New with core3. Does what flush() did in core2;
+#endif
     glob_script_mem.Script_PortUdp.stop();
     glob_script_mem.udp_flags.udp_connected  = 0;
   }