fix: make router socket non-blocking to prevent poll loop stalls

sketch/Image.cpp

@@ -0,0 +1,60 @@
+/*
+  This file is part of the ArduinoGraphics library.
+  Copyright (c) 2025 Arduino SA. All rights reserved.
+*/
+
+#include <stddef.h>
+
+#include "Image.h"
+
+Image::Image() :
+  Image(ENCODING_NONE, (const uint8_t*)NULL, 0, 0)
+{
+}
+
+Image::Image(int encoding, const uint8_t* data, int width, int height) :
+  _encoding(encoding),
+  _data(data),
+  _width(width),
+  _height(height)
+{
+}
+
+Image::Image(int encoding, const uint16_t* data, int width, int height) :
+  Image(encoding, (const uint8_t*)data, width, height)
+{
+}
+
+Image::Image(int encoding, const uint32_t* data, int width, int height) :
+  Image(encoding, (const uint8_t*)data, width, height)
+{
+}
+
+Image::~Image()
+{
+}
+
+int Image::encoding() const
+{
+  return _encoding;
+}
+
+const uint8_t* Image::data() const
+{
+  return _data;
+}
+
+int Image::width() const
+{
+  return _width;
+}
+
+int Image::height() const
+{
+  return _height;
+}
+
+Image::operator bool() const
+{
+  return (_encoding != ENCODING_NONE && _data != NULL && _width > 0 && _height > 0);
+}