Restructure and improve

main/wifi.h

@@ -0,0 +1,19 @@
+#ifndef WIFI_H
+#define WIFI_H
+
+#include <stdbool.h>
+
+/**
+ * Initialise WiFi in STA mode, connect to the SSID defined in Kconfig,
+ * and register event handlers.  Blocks until a first connection attempt
+ * is made, but does NOT block forever – reconnection is handled in the
+ * background.
+ */
+void wifi_init(void);
+
+/**
+ * Returns true when the station has a valid IP address (i.e. WiFi is up).
+ */
+bool wifi_is_connected(void);
+
+#endif /* WIFI_H */