- Abstract the memory stats into its own class.

- Fix a bug with debug mqtt
- nrf52 needs more love, there's a strange error while linking. Help appreciated

src/memGet.cpp

@@ -0,0 +1,46 @@
+#include "memGet.h"
+#include "configuration.h"
+
+MemGet memGet;
+
+uint32_t MemGet::getFreeHeap()
+{
+#ifdef ARCH_ESP32
+    return ESP.getFreeHeap();
+#elif defined(ARCH_NRF52)
+    return dbgHeapFree();
+#else
+    // this platform does not have heap management function implemented
+    return UINT32_MAX;
+#endif
+}
+
+uint32_t MemGet::getHeapSize()
+{
+#ifdef ARCH_ESP32
+    return ESP.getHeapSize();
+#elif defined(ARCH_NRF52)
+    return dbgHeapTotal();
+#else
+    // this platform does not have heap management function implemented
+    return UINT32_MAX;
+#endif
+}
+
+uint32_t MemGet::getFreePsram()
+{
+#ifdef ARCH_ESP32
+    return ESP.getFreePsram();
+#else
+    return 0;
+#endif
+}
+
+uint32_t MemGet::getPsramSize()
+{
+#ifdef ARCH_ESP32
+    return ESP.getPsramSize();
+#else
+    return 0;
+#endif
+}