chore: mqtt impl, fix more wiznet bugs

include/w5500.h

@@ -19,8 +19,6 @@ typedef struct {
 
 extern volatile int ip_assigned;
 
-void handle_ip_assigned(void);
-
 // Initializes the W5500 chip
 void configure_network(void);
 
@@ -29,17 +27,6 @@ void dhcp_init(void);
 void dhcp_process(void);
 
 // resolves a domain name
-void resolve_domain_name(const char* domain_name);
-
-// init and connect the MQTT client
-int setup_mqtt_client(Network* network, ch32_mqtt_options_t* opts,
-                      MQTTClient* client);
-
-int subscribe_to_topic(MQTTClient* client, const char* topic, enum QoS qos,
-                       messageHandler message_callback);
-
-// publish a message to a topic
-void publish_message(MQTTClient* client, const char* payload,
-                     const char* topic);
+// void resolve_domain_name(const char* domain_name);
 
 #endif  // W5500_H