Add ESP32 setPhyMode in WiFi Init and force HT20

lib/default/WiFiHelper/src/WiFiHelper_ESP32.cpp

@@ -190,10 +190,29 @@ int WiFiHelper::getPhyMode() {
 }
 
 bool WiFiHelper::setPhyMode(WiFiPhyMode_t mode) {
-  // 1 = B
-  // 2 = BG
-  // 3 = BGN
-  // 4 = BGNAX
+  /*
+    mode 1 = B
+    mode 2 = BG
+    mode 3 = BGN
+    mode 4 = BGNAX
+  */
+  /*
+    ESPEasy:
+    HT20 = 20 MHz channel width.
+    HT40 = 40 MHz channel width.
+    In theory, HT40 can offer upto 150 Mbps connection speed.
+    However since HT40 is using nearly all channels on 2.4 GHz WiFi,
+    Thus you are more likely to experience disturbances.
+    The response speed and stability is better at HT20 for ESP units.
+  */
+  esp_wifi_set_bandwidth(WIFI_IF_STA, WIFI_BW_HT20);
+  /*
+    ESPEasy:
+    Set to use "Long GI" making it more resilliant to reflections
+    See: https://www.tp-link.com/us/configuration-guides/q_a_basic_wireless_concepts/?configurationId=2958#_idTextAnchor038
+  */
+  esp_wifi_config_80211_tx_rate(WIFI_IF_STA, WIFI_PHY_RATE_MCS3_LGI);
+
   uint8_t protocol_bitmap = WIFI_PROTOCOL_11B;      // 1
   switch (mode) {
     case 4: protocol_bitmap |= WIFI_PROTOCOL_11AX;  // 16

tasmota/tasmota_support/support_wifi.ino

@@ -329,13 +329,9 @@ void WifiBegin(uint8_t flag, uint8_t channel) {
 
   WiFiSetSleepMode();
   WifiSetOutputPower();
-//  if (WiFiHelper::getPhyMode() != WIFI_PHY_MODE_11N) { WiFiHelper::setPhyMode(WIFI_PHY_MODE_11N); }  // B/G/N
-//  if (WiFiHelper::getPhyMode() != WIFI_PHY_MODE_11G) { WiFiHelper::setPhyMode(WIFI_PHY_MODE_11G); }  // B/G
 #ifdef ESP32
-  if (Wifi.phy_mode) {
-    WiFiHelper::setPhyMode(WiFiPhyMode_t(Wifi.phy_mode));  // 1-B/2-BG/3-BGN/4-BGNAX
-  }
-#endif
+  WiFiHelper::setPhyMode(WiFiPhyMode_t((Wifi.phy_mode > 0) ? Wifi.phy_mode : 4));  // 1-B/2-BG/3-BGN/4-BGNAX
+#endif  // ESP32
   WiFi.setAutoReconnect(true);
   switch (flag) {
   case 0:  // AP1