use espressif 6.0.1 and c+17 for testing

platformio.ini

@@ -16,12 +16,12 @@ core_build_flags =
   -D NDEBUG
   -D ARDUINO_ARCH_ESP32=1
   -D ESP32=1
-  ; -std=gnu++17
-  -Os
+  -std=gnu++17
+  ; -Os
 
-; core_unbuild_flags = -std=gnu++11 
+core_unbuild_flags = -std=gnu++11 
 ; core_unbuild_flags = -std=gnu++17 
-core_unbuild_flags =
+; core_unbuild_flags =
 
 ; my_build_flags is set in pio_local.ini
 my_build_flags =
@@ -40,8 +40,8 @@ unbuild_flags =
   ${common.core_unbuild_flags}
 
 [espressi32_base]
-; platform = espressif32
-platform = espressif32@5.2.0
+platform = espressif32
+; platform = espressif32@5.2.0
 ; platform = espressif32@5.3.0
 ; platform = espressif32@6.0.0
 framework = arduino