T-Echo does not have Serial2

src/modules/Modules.cpp

@@ -23,8 +23,10 @@
 #endif
 #if defined(ARCH_ESP32) || defined(ARCH_NRF52)
 #include "modules/ExternalNotificationModule.h"
+#if !defined(TTGO_T_ECHO)
 #include "modules/SerialModule.h"
 #endif
+#endif
 /**
  * Create module instances here.  If you are adding a new module, you must 'new' it here (or somewhere else)
  */

src/modules/SerialModule.cpp

@@ -69,7 +69,7 @@ SerialModuleRadio::SerialModuleRadio() : SinglePortModule("SerialModuleRadio", P
 
 int32_t SerialModule::runOnce()
 {
-#if defined(ARCH_ESP32) || defined(ARCH_NRF52)
+#if (defined(ARCH_ESP32) || defined(ARCH_NRF52)) && !defined(TTGO_T_ECHO)
     /*
         Uncomment the preferences below if you want to use the module
         without having to configure it from the PythonAPI or WebUI.
@@ -215,7 +215,7 @@ void SerialModuleRadio::sendPayload(NodeNum dest, bool wantReplies)
 
 ProcessMessage SerialModuleRadio::handleReceived(const MeshPacket &mp)
 {
-#if defined(ARCH_ESP32) || defined(ARCH_NRF52)
+#if (defined(ARCH_ESP32) || defined(ARCH_NRF52)) && !defined(TTGO_T_ECHO)
     if (moduleConfig.serial.enabled) {
 
         auto &p = mp.decoded;