move SerialConsole to event based trigger

arch/esp32/esp32.ini

@@ -36,6 +36,7 @@ build_flags =
   -DCONFIG_BT_NIMBLE_HOST_TASK_STACK_SIZE=8192
   -DESP_OPENSSL_SUPPRESS_LEGACY_WARNING
   -DSERIAL_BUFFER_SIZE=4096
+  -DSERIAL_HAS_ON_RECEIVE
   -DLIBPAX_ARDUINO
   -DLIBPAX_WIFI
   -DLIBPAX_BLE

src/SerialConsole.cpp

@@ -22,7 +22,10 @@ SerialConsole *console;
 
 void consoleInit()
 {
-    new SerialConsole(); // Must be dynamically allocated because we are now inheriting from thread
+    auto sc = new SerialConsole(); // Must be dynamically allocated because we are now inheriting from thread
+#ifdef SERIAL_HAS_ON_RECEIVE
+    Port.onReceive([sc]() { sc->rxInt(); });
+#endif
     DEBUG_PORT.rpInit(); // Simply sets up semaphore
 }
 
@@ -66,13 +69,17 @@ int32_t SerialConsole::runOnce()
 {
 #ifdef HELTEC_MESH_SOLAR
     // After enabling the mesh solar serial port module configuration, command processing is handled by the serial port module.
-    if(moduleConfig.serial.enabled && moduleConfig.serial.override_console_serial_port
-        && moduleConfig.serial.mode==meshtastic_ModuleConfig_SerialConfig_Serial_Mode_MS_CONFIG)
-    {
+    if (moduleConfig.serial.enabled && moduleConfig.serial.override_console_serial_port &&
+        moduleConfig.serial.mode == meshtastic_ModuleConfig_SerialConfig_Serial_Mode_MS_CONFIG) {
         return 250;
     }
 #endif
+#ifdef SERIAL_HAS_ON_RECEIVE
+    int32_t delay = runOncePart();
+    return Port.available() ? delay : INT32_MAX;
+#else
     return runOncePart();
+#endif
 }
 
 void SerialConsole::flush()
@@ -80,6 +87,18 @@ void SerialConsole::flush()
     Port.flush();
 }
 
+// trigger tx of serial data
+void SerialConsole::onNowHasData(uint32_t fromRadioNum)
+{
+    setIntervalFromNow(0);
+}
+
+// trigger rx of serial data
+void SerialConsole::rxInt()
+{
+    setIntervalFromNow(0);
+}
+
 // For the serial port we can't really detect if any client is on the other side, so instead just look for recent messages
 bool SerialConsole::checkIsConnected()
 {

src/SerialConsole.h

@@ -32,11 +32,14 @@ class SerialConsole : public StreamAPI, public RedirectablePrint, private concur
     virtual int32_t runOnce() override;
 
     void flush();
+    void rxInt();
 
   protected:
     /// Check the current underlying physical link to see if the client is currently connected
     virtual bool checkIsConnected() override;
 
+    virtual void onNowHasData(uint32_t fromRadioNum) override;
+
     /// Possibly switch to protobufs if we see a valid protobuf message
     virtual void log_to_serial(const char *logLevel, const char *format, va_list arg);
 };