added isWireless function to Modem

src/kernel/peripherals/Modem.hx

@@ -34,6 +34,10 @@ class Modem implements INetworkInterface implements IPeripheral {
 		});
 	}
 
+	public function isWireless():Bool {
+		return native.isWireless();
+	}
+
 	public function listen(chan:Int) {
 		native.open(chan);
 	}