Fix #807 TCP API on ESP32. thanks @jfirwin your hint made the problem easy to find!

geeksville-private/TODO.md

@@ -2,7 +2,7 @@
 
 You probably don't care about this section - skip to the next one.
 
-* investigate TCP on ESP32 https://github.com/meshtastic/Meshtastic-python/issues/90
+* DONE investigate TCP on ESP32 https://github.com/meshtastic/Meshtastic-device/issues/807
 * fix python tool problem with windows and the heartbeat
 * router mode dropping messages? https://meshtastic.discourse.group/t/router-mode-missing-messages/3329/3
 * fix ttgo eink screen

src/mesh/wifi/WiFiServerAPI.h

@@ -22,6 +22,9 @@ class WiFiServerAPI : public StreamAPI
 
   protected:
 
+    /// We override this method to prevent publishing EVENT_SERIAL_CONNECTED/DISCONNECTED for wifi links (we want the board to stay in the POWERED state to prevent disabling wifi)
+    virtual void onConnectionChanged(bool connected) {}
+
     virtual int32_t runOnce(); // Check for dropped client connections
 
     /// Check the current underlying physical link to see if the client is currently connected