only move to self.target coordinates

robot.py

@@ -32,9 +32,7 @@ class Robot:
         self.target = []
         self.buffer = bytes()
 
-    def move(self, coords=None):
-        if coords is not None:
-            self.target = coords
+    def move(self):
         hexval = [hex(dec).lstrip("0x").rstrip("L") for dec in self.target]
         str = '{'+','.join(hexval)+'}'
         str = str.lower().encode()