chore: mqtt impl, fix more wiznet bugs

include/mqtt_handler.h

@@ -0,0 +1,25 @@
+#ifndef MQTT_HANDLER_H
+#define MQTT_HANDLER_H
+
+#include <DHCP/dhcp.h>
+
+#include "ch32v003fun.h"
+#include "w5500.h"
+
+typedef struct {
+  Network network;
+  MQTTClient client;
+  ch32_mqtt_options_t opts;
+  uint32_t last_reconnect;
+  uint32_t last_yield;
+  uint8_t is_connected;
+  char base_topic[64];
+} mqtt_state_t;
+
+void mqtt_init(mqtt_state_t* state);
+void mqtt_process(mqtt_state_t* state);
+void message_arrived(MessageData* md);
+void publish_value(MQTTClient* client, const char* device_name,
+                   const char* property, uint16_t value);
+
+#endif